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The Flea life cycle
Understanding how fleas live, and breed, makes it easier to
understand the best methods available to eradicate a flea problem.
EGGS.
One female adult flea can lay anything from one to FORTY eggs each
day, with the highest concentration of egg-laying occurring in the final two to
three days of life. Eggs are oval, around 0.5mm long, white and rounded at both
ends. The eggs are not sticky so once laid, they immediately fall onto the
ground, wherever the host is at that time.
They are produced about one each hour.
Depending upon the temperature and
most importantly, humidity, the eggs will
hatch into larvae within two to ten days. Humidity below 50% may cause them to
dry out and become food for luckier hatchlings. The environment in which the eggs are
deposited is therefore of prime consideration to flea survival rate and helps to
explain why warmer winters and hot summers have increased flea populations
considerably in recent years. Homes should be well aired and this will help the
drying effect and possibly protect against not only fleas but also the dust-mite.
LARVAE.
A larva will hatch from an egg using a chitin tooth - an egg
splitting spine on its head. This disappears when the larva changes into the
second of its three 'moults' or development stages. It is this tooth that is
changed by modern oral flea treatments. Treatments contain an insect development
inhibitor renders the chitin tooth ineffective, this prevents
the larvae from cutting his way out.
Larvae are semi-transparent and sparsely covered in short
hairs. They are usually white with a yellow-brownish head and are generally
quite active. They are dependent on a diet of adult flea faeces for survival, but will also feed on other organic debris
in your carpet. In this domestic environment, flea larvae are found at the base
of the carpet pile, where they can encounter food, are sheltered by the canopy
of carpet fiber and can keep away from direct light. So it is clear that the
more powerful any vacuum cleaner you have the greater ability for it to
suck these little varmints out and into the dust container for disposal.
PUPAE.
After the third moult, the larva moves to an
undisturbed place to begin spinning a silk cocoon coated with particles of
debris picked up from its surrounhe next
stage of development - the pupa. Pupae subjected to suitable hatching conditions can emerge
as adult fleas as early as three to five days following pupation. From this stage, the adult flea develops. The
fully formed adult flea remains in the cocoon until stimulated to hatch by, for
example, warmth, vibration and even exhaled carbon dioxide from a passing
potential host - which includes the human!
Under
certain laboratory conditions fleas have lived dormant like this for up to five
years. So even an empty house can harbor these problems until the unsuspecting
new tenant moves in creating the phenomenon known as the 'pupal window' and you need to be aware of it before effective flea
treatment can begin.
Environmental sprays and powders
cannot readily penetrate
the cocoon and therefore have no effect on the maturing adult inside if used on
their own. These fleas continue to hatch from their protective
cocoons and, unless the flea control regime is maintained, will be the source of
the next generation of fleas ready to cause you and your dog more problems!
ADULTS
Almost immediately after the adult flea has hatched from its cocoon, it will begin looking for its first blood meal. Unlike the flea larva,
which tends to move away from light, adult fleas move upwards and towards the light, in order
to be in a better position to locate a suitable victim.
The flea's eyesight is not brilliant and so
warmth and
carbon dioxide in the air appear to be answerable for helping it find its goal. Air currents will be
changed by a cat or dog moving past the adult flea, the carbon dioxide increases
and the flea detects these changes and jumps in the hope of landing in close proximity to the waiting adult.
Adult fleas have been known to jump as many as 10,000
times in succession, whilst trying to leap onto a passing cat or dog - the flea
knows they are close by but it's more a question of luck than judgment when
trying to make a successful connection between the hooks on the flea's legs and
the fur on the cat or dog.
However, once satisfactorily 'anchored', the flea will
immediately begin to feed and the females will begin laying eggs after only 48 hours
after
the first feed. Before drinking the blood, the flea secretes special enzymes
within its saliva into the
wound. This substance softens and spreads the skin tissue,
assisting with feeding. More helpfully the saliva contains an anti-coagulant
making the blood flow. This saliva is usually the cause of allergic
reactions in cats, dogs - and humans.
Once on a suitable host, the adult fleas will remain there
until they die, which is usually within one or two weeks. Unfortunately for the
pet, although providentially for the parasite population, females tend to live
longer than males and there are naturally more females than males. If the animal is
left to groom itself normally and cats groom more thoroughly than dogs on the
whole, many adult fleas will be dislodged or swallowed naturally. However,
if for any reason, the animal is unable to groom itself - it may be ill for
example, then the owner should groom it more frequently than usual, to complement
their pet's natural methods of flea control.
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Thank You !
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Frontline®
Plus contains two active ingredients: fipronil and (S)-methoprene. By
specifically targeting the flea neuron,
fipronil kills adult
fleas, flea eggs and flea larvae. It’s also effectively kills all stages
of ticks.
(S)-methoprene is a insect growth regulator. It prevents flea eggs, larvae and
pupae from developing into adult fleas.
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Bacteria
- Microscopic single-celled organisms found wherever life is possible. Generally 0.0001–0.005 mm long, they may be spherical (coccus), rodlike
(bacillus), or spiral-shaped (spirillum) and often occur in chains or clusters of cells. True bacteria have a rigid cell wall, which may be surrounded by a slimy capsule, and they often have long
whip-like flagella for locomotion and short hair-like pili used in a form of sexual reproduction. A few bacteria can use simple chemical substances, including carbon dioxide from the atmosphere, to manufacture their own nutrients, but most require a source of carbon derived from living organisms (i.e. organic carbon) plus other nutrients for growth. Some bacteria can reproduce every 15 minutes, leading
to rapid population growth.
The most important role of bacteria is in decomposing dead plant and animal tissues and releasing their constituents to the soil (see
carbon cycle). Nitrogen-fixing bacteria in the soil or sea convert atmospheric nitrogen gas to nitrites and nitrates, which can then be used by plants (see
nitrogen cycle). Cheese making and fermentation reactions depend on bacteria. Bacteria also play an important part in animal digestion, especially in ruminants. However, certain (pathogenic) species may cause disease while others, such as Salmonella, can cause
food poisoning.
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How
Does Your Body Fight Infection?
Immunity
- The resistance of the body to infection, especially resistance due to
antibodies. Babies have passive immunity from antibodies transferred from the mother’s blood through the placenta. Active immunity involves the formation of antibodies after exposure to an antigen
- bacteria that invade the body during an infection are antigens. The two different kinds of immune response produced by antibodies involve: white blood cells called T-lymphocytes
- produced by the thymus, which produce cells with antibody properties bound to their surface and are responsible for such reactions as graft rejection; B-lymphocytes, which produce cells that release free antibody into the blood.
Leucocyte
- lymphocytes - or white blood cell. A colorless cell found in large numbers in the blood. There are several kinds, all involved in the body’s
defense mechanisms. Granulocytes and monocytes destroy and feed on bacteria and other microorganisms that cause infection
- see also phagocyte. The lymphocytes are involved with the production of
antibodies.
Phagocyte
- A cell that engulfs and then digests particles from its surroundings: this process is called phagocytosis. In vertebrate animals, phagocytes are a type of white blood cell that protect the body by engulfing bacteria and other foreign particles.
Immunization is the production of immunity by an injection containing antibodies against specific diseases
e.g. tetanus and diphtheria, which provides temporary passive immunity, or by
vaccination, which produces the longer lasting active immunity.
Antibody
- A protein produced by certain white blood cells -
lymphocytes that reacts with a particular foreign particle e.g. a
bacterium, that has entered the body. The antibody helps to destroy the foreign particle,
known as the antigen. If the same bacteria invade the body in future, many more of the same antibodies are produced, enabling the body to destroy the bacteria very rapidly and so resist infection. This provides the basis of
immunity. Antibodies are also responsible for the rejection of foreign tissue or organ transplants. See also
monoclonal antibody.
Monoclonal antibody
- A type of pure antibody that can be produced artificially in large quantities and used, for example, to distinguish the major blood groups. Mouse lymphocytes producing the required antibody are fused with mouse cancer cells; the resulting hybrid cells multiply rapidly and all produce the same type of antibody as their parent lymphocytes.
Whilst
all this bodily protection sounds wonderful, the problem with MRSA, is
that there is no defense to it, no answer to its attack.
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Fleas are very small robust insects that are
also parasites. Defined by any dictionary as 'self-seeking hangers-on'. They live,
as all parasites do, human or otherwise, by living on something or someone
else, sucking nutriment directly from their victim. In
the flea's case, this means drinking the 'host' animal's blood.
Siphonaptera,
is the Latin name for the collective
species of fleas and there are around 3,000 different species currently recognized
by flea-authorities around the world. 95% of these occur on mammals with
around 5% occurring on birds.
Whatever an adult flea is living on, is
commonly referred to as the
'host' and different species of flea are usually named after the 'host' on which
they were first discovered or are most usually found. Such as the cat flea, dog flea,
hedgehog or rabbit flea for example. Some fleas have developed particular liking
for particular hosts, though most fleas will 'holiday' on anything alive given
the chance. In fact it has been said that fleas even have fleas and those fleas
have fleas, or some equally obnoxious parasite, ad infinitum.
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Common Name |
Scientific Name |
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Cat Flea |
Ctenocephalides felis (Bouche) | |
Dog Flea |
Ctenocephalides canis (Curtis) | |
Northern Rat Flea |
Nosopsyllus fascinators (Bosc) |
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Oriental Rat Flea |
Xenopsylla cheopis (Rothschild) | |
Rabbit Flea |
Cediopsylla simplex (Baker) | |
Human Flea |
Pulex irritans |
Fleas are not always peculiar only to their
namesakes. For example, the most common flea on both dogs and cats is the cat
flea, Ctenocephalides
felis, but both cats and dogs can also occasionally be
affected by other fleas, such as rabbit and bird fleas.
Ctenocephalides canis
- the dog flea, which has been previously found in great numbers on dogs, but rarely
on cats, is becoming more scarce as dogs are more frequently kept in
environments similar to that of the domestic cat. Whilst the domestic cat
remains a free spirit and able to roam wherever, it will get fleas. The domestic
dog is no longer such a pack roamer and usually is well cared for so the best
habitat for the dog-flea is in decline. However, as has been said, any flea will
take on the maxim: ' any port in a storm ' and will drink / feed off any animal
it can land on, it still only prefers its general host though. The human-flea, in some countries
is almost relatively extinct due to greater cleanliness and awareness of such
critters.
Adult fleas are about 1/16 to 1/8-inch long, dark reddish-brown, wingless,
hard-bodied and cannot be crushed between fingers, they must be nipped between the
finger nails until you hear a snap. They have three pairs of legs and the back
legs are very enlarged and enable jumping. The legs can be recoiled like springs
and then released with an explosion of energy. Fleas are excellent jumpers, leaping vertically up to
seven inches, moving up to thirteen inches across surfaces. A flea can jump a 250
feet high and 450 feet along in human terms, as long as the starting point is of
sufficient resistance. This is, pound for pound, the greatest jump of any
creature on the planet.
They
are flattened very thin vertically, this allows easy movement between the hair, fur or
feathers of the host. Even though they are adapted for this, for obvious reasons
maybe, there is no sheep-flea; a sheep's coat is too thick to allow convenient
movement.
The
adult flea have
piercing-sucking mouthparts and spines on the body projecting backward. Also,
there is a row of spines on the face known as the genal comb. They feed by
piercing the skin layers of any warm animal and just like the aphid that pierces
the skin of the plant, they do not do much sucking, but rely on natural pressure
of the body. In our case, our natural blood-pressure forces blood out straight
into the mouth of the flea.
Generally,
this blood would coagulate or thicken to try and block the wound, but the flea,
just like most other blood-sucking insects, introduces a chemical that
stops this coagulation.
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After
mating, and a good feed, the female has sufficient protein to develop
eggs in her body. The eggs are smooth,
oval and white. But they are also sticky; this natural glue attracts local debris,
that acts as camouflage.
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Larvae are 1/4-inch long, slender, straw-colored, brown headed,
wormlike, bristly-haired creatures, with 13 body segments, that are legless and have
chewing mouthparts. They are continually active and avoid light by burrowing
into the nest or carpet pile.
Pupae are enclosed in silken
cocoons covered with particles of debris. The larvae feed mainly on human skin
flakes and even the discarded faeces of the adult flea. The adult sucks copious
amounts of blood and this is readily digested and disposed of, because this
digestion is inefficient, perhaps 70% of the adult's waste still contains nutrition.
The fleas have 4 phases of development - the
egg, the free-living larva, the
pupa and the imago. Imago: The adult sexually mature stage in the life cycle of an insect after metamorphosis.
Fleas have been around for millions of years - a
fossilized flea found in Australia is said to be 200 million years old. It does
not
differ significantly from today's fleas. Different species can be found from the
Arctic Circle to the Arabian deserts - even penguins have fleas which counteract
the cold by ensuring that their growth into adulthood coincides with the time
when penguins are sitting firmly on their eggs, thereby keeping both fleas and
their young in a warm environment!
Adult cat fleas are generally around 2mm long, with
females being larger than males. The largest species of flea is Hystrichopsylla
schefferi - a flea found in the nest of a mountain beaver in Puyallup,
Washington, USA in 1913. The female can grow up to 8mm long. This is almost a
third of an inch.
During their life cycle, cat and dog fleas undergo
complete metamorphosis, going through the four developmental stages from egg to
larvae, pupae and on to adulthood. As adults, once they have found a suitable
host - your dog or cat for example - they can remain there until they die, or
are groomed off - their life on your pet is only about 1-2 weeks. It is
generally a
misconception that they jump freely to other hosts, however, a jumping flea may
land on a passing mammal and make it a home. This host could be you as it is
attracted to heat and vibrations and leaps out where it thinks it will find
food.
As
well as this fleas do readily just drop off, if looking to reproduce, but they
can also find a mate within the fur of the host, so there is no hard and fast
rule.
Like
most living creatures, fleas, in all stages of development, are affected greatly
by humidity and temperature. They need water in their environment just as we do,
and will die without a suitable environment; liking quite a warm humid
temperature, where they will thrive as long as they have mammals as a symbiosis
companion.
The most important thing to learn about the flea is that
it is not the adults that present the main problem in flea control. Research has
shown that, in an average household, adult fleas only represent around 5% of a
total Siphonaptera population. Flea pupae account for around 10%; fleas in the larval
stages around 35%; whilst flea eggs make up a whopping 50% of the total! Adult
fleas will die naturally within one or two weeks following their arrival on your
dog or cat. Simply treating your dog or cat with an appropriate insecticide to kill the adult
fleas means that 95% of the flea population are unaffected and are
simply left to develop into new adults all around your home.
Because
of this time-bomb situation you must accept that you have a potential
catastrophic set of circumstances to contend with. In some situations where
fleas have been left to flourish, say when dogs or cats have been abandoned and
locked up in an enclosed environment. SPCA inspectors have been met on occasion
with a ravishing
army of literally hundreds of thousand of fleas. One female inspector has said
that as she was wearing a skirt was 'attacked' and she could hardly see any of
her lower legs due to the massing of fleas attaching themselves on to her in some
feeding frenzy.
Things
in most homes would never get this bad but could come quite close. If you keep
animals you must also accept that you will get fleas. The flea-population is directly
proportional to how you cope. Without a doubt your best defense is the humble
vacuum-cleaner, and the more powerful the better. Some cleaners are so powerful
that they will lift the carpet slightly off the floor and suck out quite a lot
of debris such as the aforementioned human skin.
[
It was this site some years back that first mentioned the vacuum cleaner as
the best tool to defeat fleas; now they all refer to it. ]
See
DUST
MITES.
See
ANTS
See
BEDBUGS
See
HEAD
LICE
See
Mosquitoes
A
good Hoover will takes away eggs, larvae, some fleas and of course their
potential food source. So if you think that you may have an infestation you
must Hoover daily if not twice daily. This breaks the life-cycle.
The
larvae will feed on human skin flakes, scabs from flea bites, any organic material really and flea
droppings. The adult flea will gorge on the blood of its host and as its
digestion system is not that efficient its excrement
or faeces will contain a lot of undigested clotted blood. The droppings are generally
moon shaped and the color of coffee beans and a staple diet for the flea larvae.
Dogs and cats, especially those in rural areas,
occasionally pick up fleas other than Ctenocephalides felis or Ctenocephalides
canis, such as those listed, through burrowing into the living quarters and
living environments of the different host species, where newly hatched fleas may
be waiting. Bird fleas can even be collected by pets because they are very
common in nesting boxes and often migrate out of them. Many drop to the ground,
from where any passing mammal can be 'preyed'.
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NATURAL
WAYS OF DEFEATING THE FLEA.
The
Vacuum Cleaner - Make sure you get right into the corners. Vacuum as
much as possible and you will get rid of them. Dispose of the bag or
contents carefully, sealing in several plastic bags. Or burn if it is
safe to do so.
Fleas can live,
in stasis, up to FIVE
years without blood. They will not go away but just look for the nearest
mammal. YOU or your family, and your dogs! BY sucking up the eggs and
the larvae, you must BREAK their cycle of life.
For yourself, you can rub on chamomile lotion at night. Add salt to your
bath at night or go paddling in the sea; this will help heal the bites
more quickly. Rub your legs with some kind of bespoke insecticide or
repellent. . OR Citronella Oil, TeaTree Oil, Pennyroyal, Eucalyptus Oil,
Lavender Oil, or Cedar Wood Oil, as they do not like these strong odors.
Eating a lot of garlic is also good as a repellent but it does not only
repel insects.
For
problems in the garden - Diatomaceous Earth
What is Diatomaceous Earth?
It
is a benign, non-toxic, and generally a safe material derived from
age-old fossils of freshwater organisms and marine life, then crushed to
a fine powder. Observed through a microscope, the particles resemble minuscule
bits of broken glass and are very abrasive. Deadly to any insect
and usually completely harmless to animals, fish, or fowl, even when
used in their food. Most insects have a waxy outer shell covering their
bodies. Diatomaceous
Earth eventually
scratches through this shell causing the insect to dehydrate, which leads
to eventual death.
For severe infestations, however,
pesticides may be used. Buy a bespoke insecticide from the Internet but only
after looking at as many websites offering insecticides as possible.
Try
placing a large bowl of hot water in the middle of a room over night.
The heat will attract fleas and they will jump into the water. See how
many you can catch.
In
any event, do not panic.
The
best thing you
can do in get out the vacuum cleaner and give the place a good clean,
which I am sure you do anyway. Vacuum twice daily until the problem has
gone, getting into corners. Vacuum / Clean up the sleeping area of your
animal as well. Vacuum suspect furniture.
Make
sure you get right into the corners. Vacuum as much as possible and you
will get rid of them. Fleas can live up to FIVE years without blood,
they
just lie in stasis, until you disturb them. They will not go away but
just look for the nearest mammal. YOU or your family! Generally though,
they only live for six weeks if actively feeding.
Fleas
lay eggs that turn into larvae and pupae. Vacuuming sucks up eggs,
larvae and pupae.
THIS
BREAKS THE CYCLE OF LIFE.
Vacuuming
well, this is your very best option. We mentioned this several years
ago, now all sites mention this. Only 5 - 10% of fleas are on you or
your animal at anytime, the rest are living in your home, or
outside.
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Back
to Top
Has your
dog / cat got fleas?
In all likelihood, the answer is 'yes' even if it's not
immediately obvious. There are around 14 million cats and dogs in Britain today;
five times more in the States and all pets will, at some time in their lives, be irritated by fleas.
Fleas are the most common cause of skin irritation in cats
and dogs. Many vets confirm that up to two thirds of their time, especially in
the summer, is spent treating flea-related conditions in pets.
Locking
the stable-door, after the horse has bolted.
If
you have pets, you should now know that your pet WILL get fleas during some part
of its life, and this will be to varying degrees. Do not leave the problem until it has become so serious
that your pet is really uncomfortable and you have fleas jumping all over the
place, especially to such a point that will tantamount to a household infestation,
as this will become very difficult to control. The longer you leave things the more
serious the situation will get and the more difficult then to remove.

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Do check your pets regularly for fleas
by carefully grooming and searching.
Vacuum
clean as often as possible, not forgetting the edges and corners. Spray some
recommended crawling insect spray around the edges of your home.
[ See Dust Mites
]
Ask your vet for advice about a
sustainable
treatment that will be suitable for you and your pet's circumstances e.g.
living conditions, rural or urban surroundings, proximity to other, possibly
untreated pets.
Vacuum
clean as often as possible, not forgetting the edges and corners. Spray some
recommended crawling insect spray around the edges of your home.
Do
not just smother everything in with the first or cheapest flea treatment that you find.
Insecticides
may well kill adult fleas but they may not kill other members, 95%, in other
parts of the life cycle.
Vacuum
clean as often as possible, not forgetting the edges and corners. Spray some
recommended crawling insect spray around the edges of your home.
Do
not just consider treating your pets but also the
areas in which they walk, play and sleep. Those of the 95%, a time bomb,
will be there waiting. |

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Human Fleas |
How
to recognize a flea problem
Apart from suffering from flea bites yourself,
feeling the itching and seeing the many small red scabs especially on the calves
of the leg, which will eventually become larvae food, you must be aware of your
pet's discomfort.
There are three easy warnings you can use to check for the presence of fleas on your
pet.
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The pet will be scratching itself frequently,
perhaps in a
very agitated manner. All animals - like humans - will itch occasionally but
you should be able to recognize if a pet develops a recurring and irritating
itch from having fleas. A flea itch is not usually caused by the adult flea
moving around on the animal's skin. It is more normally caused through the
pet developing an allergy to the flea's saliva. But even so the bite can be
felt and you yourself may innocently just treat it as a normal scratch.
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Not all pets will show an allergic reaction however.
Just like humans, some are affected and some are not. Another way to spot a
flea problem is by recognizing flea droppings in the pet's coat. If you
groom your pet regularly, you may find flea droppings amongst their coat.
These are small and black, and resemble ground pepper, sometime shaped in a
curve. They are made up of
blood and secretions from the adult flea and should not be confused with
live adult fleas which are bigger and move considerably faster! Faeces
will dissolve on a moist piece of cotton wool, leaving a red bloody blotch.
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Any evidence of skin disease can have fleas as the
primary cause. So if your dog or cat exhibits any hair loss, soreness or
skin problems, take it to your vet. Do not just hope it might
disappear, it probably will not and may get worse.
If
you cannot afford a vet, in any event get rid of the flea problem as
best you can. Hoover every day and do a good job. Look at some of the AD
links, and buy a simple spray; spray your home as best
you can.
Bath
your pet in a recommended flea-shampoo.
Where
a reaction to the flea bites has visibly asserted itself and this will be a
large sore usually, made worse by your pet's constant scratching. This sore can
become infected and an anti-biotic maybe the best cure, along with a recommended
anti-inflammatory cream. If these are not available to you, do not snip the
hair off your pet where the injury is. Bath the infected place twice a day with
salt water and try to get it as clean as possible, dry it off with a clean
cloth. Buy a home remedy anti-disinfectant, like Tea-Tree Oil and rub it into
the wound. Eventually this should clean up. It will become dry and crusty and
some fur may fall off. But if it is dry this is usually a good sign. Of course
if it becomes worse, you may have find a cheap vet.
Grooming.
If possible, always groom your pet outside on concrete, as newly laid flea eggs will then fall
out on to a more alien environment. Any lower temperature and relatively low humidity levels will help
to ensure that fleas in any stage of life, will perish. Groom regularly and make
it daily. A regularly groomed coat is a healthy one and one 'thinned-out' and better equipped to deal
with fleas.
Back
to Top
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Fighting Fleas
Naturally.
Chemicals and
sprays are the most common tools used but at what detriment to the health
of you and your family?
The following
informs of a few natural, non-toxic ideas to help make your home,
garden, and pets less appealing to
fleas. These methods may not eliminate an existing problem, but will
greatly assist in keeping the numbers down to a manageable level.
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Sprinkle
copious amounts of borax
powder on your carpets, and leave for as long as you can. Then
vacuum thoroughly. The borax draws in fluids and dries the insect
out, killing it. You can mix borax and baking soda together to
make a natural rug
deodorizer. This is not particularly recommended but it can work.
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Rub
your legs with a natural repellent, like Citronella Oil, TeaTree
Oil, Pennyroyal, Eucalyptus Oil, Lavender Oil, or Cedar Wood Oil, as
they do not like these strong odors. Eating a lot of garlic is
also good as a repellent but it does not only repel insects.
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When
you groom your animal brush in some of these oils diluted. Mix a
drop with warm
water, shake and spray onto the coat. But be warned, the fleas may
avoid your pets and start attacking you. Do not rub your animal
with pure essential oils as these can be very strong and cause
shock and discomfort.
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Brush / Comb your pet
OUTSIDE, as often as you can with a flea comb, it gets easier the
more often you do it. Grooming daily can keep
you on top of the job. Use a chemical spray to kill the fleas
on the comb.
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Spread
Nematodes, which is a natural flea treatment, available at garden-centers in you
garden. A nematode is a colorless worm, also called a roundworm, of which there are over 10,000 species. Nematodes live in soil, fresh water, and the sea. Some are parasites of plants or animals; others feed on dead organic
matter and smaller insects. See also guinea worm; hookworm; pinworm.
WORMS
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Biological
Evolution - is the believed process by which the first and most primitive of living organisms,
like the one-celled creature the amoeba, developed into the plants and animal life known today. Until the 18th century it was generally believed that each
species of life was separately created by God. The most fitting theory was put forward by Charles
Darwin and A. R. Wallace in 1858: they proposed that new species arose by a process of natural selection.
Later work and advance technology has supported Darwin’s theory, which is now generally accepted. |
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Evolution
- Survival of the fittest - If we believe in evolution, the
propensity to survive, we must recognize that most creatures are the progeny
of their ancestors. When talking about insects, fossils tell us that
they were living over 100 million years ago. We must recognize that climate
and global environment has changed over the millennia, and such variations
would have changed the living conditions of many organisms. Some so bad
that many either died out, or changed themselves, to accommodate the new
conditions. This being that those among them with a greater propensity
to survive any change, lived on.
Using
this pattern of events, when we talk of an intelligence in something
like the flea, we must realize it is not like any intelligence we might
have. The flea does what it does due to a billion repetitions of certain
characteristics, which has allowed it to survive. |
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