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Why does an insecticide that used to work well no longer affect an insect population?
Wiki User
∙ 9y ago
An insecticide that used to work well may no longer affect an insect population if they grow resistant to it. This occurs when some individuals are able to survive, and then pass on their genes to the next generations.
Wiki User
∙ 9y ago
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Why does an insecticide that used to work well no longer affect an insects population?
An insecticide that used to work well may no longer affect an insect population if they grow resistant to it. This occurs when some individuals are able to survive, and then pass on their genes to the next generations.
Why does insecticide that used to work will no longer affect an insect population?
Because there are always individual insects that are stronger than the rest, and they survive to breed. Their offspring will also be strong, or resistant to the insecticide. In time all that's left is a resistant population!
How does systemic insecticide kill aphids and cicadas?
A systemic insecticide is absorbed into the sap of the plant so any insect sucking sap or eating any green part will absorb some of the insecticide. It is also longer lasting than a contact insecticide.
Why are systemic insecticides better than common insecticides?
They are not always better. it is dependant upon insect, application site & circumstances. That only describes mode of action. What is important is results & what is actually best for the situation considerring all factors. Answer A systemic insecticide works from within the sap of the plant so lasts longer than a contact insecticide that only kills the insects on the plant at the time. A systemic insecticide does not affect the predators of the sap suckers.
Can insect bites and stings be prevented?
Insect repellant can help prevent insect bites and stings. Those with concentrated amounts of DEET stay effective longer.
Your pyracantha hedge no longer blossoms and is diseased with a whitish cotton wool type disease How should this be treated please?
It is probably mealy bug and this can be controlled with pyrethrum which is an organic insecticide made from the pyrethrum daisy. A synthetic form is typically used in modern approaches to control of this insect. The insect is also probably in the soil, so you may need to drench the soil - or just keep an eye out and re-spray whenever the white "cotton wool" creatures appear.
Which statement about Africa today is true It produces enough food to feed its population Drought and overgrazing are increasing its desert area Insect-borne disease is no longer widespread?
Drought and overgrazing aere increasung its desert areaThe land can produce enough food for its population.
When a chameleon eats a butterfly what happen to the number of butterflies in the population how could a sudden decrease in butterflies affect chameleons?
A sudden decrease in the butterfly population would cause a corresponding decrease in the chameleon population since they no longer have enough food.
What might happen if the same insect then goes into another flower?
it will grow longer
How are people affect the Amazon by hunting?
Hunters can affect the amazon by hunting because the population of species they are hunting can majorly decline. Thus, making other populations decline because the food chain no longer applies.
How exactly does DDT harm peregrine falcon?
DDT is an insecticide that is no longer used. It caused peregrine falcon eggs to break open and kill the embryos very quickly.
How did Louis Pasteur affect the world's population?
His two primary contributions were pasteurization, which makes foods safer and longer-lasting, and vaccinations, which immunize populations from the effects of many diseases.
