which stage of the mosquitoes does spraying of oil on water affect?

Question

Egg, Larvae, Pupae, Adult

Answer 1

When they are still in water i.e, their larva and pupae stages.

Answer 2

Well actually the spreading of oil can affect the three non-egg stages.
The larvae of mosquitoes, despite being aquatic, must breath atmospheric oxygen, this is aided by a siphon breathing tube which they use to break the surface tension. Oil on the surface makes it impossible for them to reach the air, thus they drown.
The pupal stage has a pair of cephalic horns, and they are used the same way as the posterior siphon of the larvae, they must be pushed throught the surface tension in order to breath, oil once again prevents this from happening.
It may also affect the adults, because when the adults are about ready to emerge, the pupae will move to the surface of the water and attach itself to the underside of the tension layer at the surface. The adult will then push otu of its pupal skin and emerge on the upper side of the water surface, oil once again prevents this from happening.

So to answer your question, bascially all stages, quite possibly the eggs too, if they are deposited on a raft and the oil causes the raft to sink prematurely or to flip.But typically these rafts will stay a float and the young first instar larvae drop from the bottom into the water, but if there is oil there, they will never be able to take their first breath!

Answer 3

All four stages. Egg, Larvae, Pupae, Adult

Answer 4

larvae and puape

All mosquitoes have one common requirement - they need stagnant/standing water to complete their life cycle.

-There are four stages to the life cycle of a mosquito: egg, larva, pupa and adult.

-The female mosquito needs the blood meal to develop her eggs. Male mosquitoes do not bite - they feed solely on plant nectar.

-Female mosquitoes can develop several hundred eggs at each blood meal and lay them in or around water. The eggs are attached to one another to form a raft or the individual eggs float on the water.

-These eggs hatch within 24-48 hours releasing larvae that are commonly called "wrigglers" because you can usually see them wriggling up and down from the surface of the water. Wrigglers occur in all kinds of standing water, such as; ditches, woodland pools and unkept bird baths - anything that holds water for more than a week.

-In about 7-10 days after the eggs hatch, larvae change to pupa before becoming adult mosquitoes. The newly emerging mosquito has to stand on still water for a few minutes to dry its wings before it can fly away. That is one reason that mosquitoes don't breed in rapidly moving water such as running brooks and streams or even a pond that has a fountain.

-The female mosquito begins to seek out an animal to feed on several days after emerging from the water. Adult mosquitoes can live for a period of four to eight weeks.

Answer 5

studies have shown that the oil doesn't stop 100% of the larvae because some of them (I'm trying to remember which it is from my "medical entomology" class - we mostly studied mosquitos) don't need oxygen or they sort of go dormant (not sure which one anymore) for a while. I'm not exactly sure of the "why" part, but I do know that oil isn't 100% effective. think about it: most mosquitos have aquatic larvae (at least of the ones that feed off of human blood, most all are aquatic. the rest feed off of animals and almost never bite humans. there is actually a very small number of species that need human blood, compared to the overall number of species of mosquitos.) if all the mosquitos (that bite humans) were killed by this oil technique, we wouldn't be so worried about West Nile and we wouldn't have to worry about mosquitos anymore (for us, we'd still have to worry about our pets.) this is an example of resistance and the reason why we are always looking for new ways to get rid of mosquitos.

Answer 6

Larvae

Answer 7

In certain stages of the developing mosquito they swim in stagnant water and must surface to get air. At the surface they are supported by the surface tension of the water while breathing. Spreading a film of oil on the surface destroys its surface tension and the little suckers can't take hold and get air and thus perish. You can often see them bobbing to the surface in a stagnant drain barrel, etc.