Is adulticide an effective means of controlling mosquitos?

Adulticiding, or the killing of adult mosquitoes by ground or aerial applications of chemicals, is considered by the Center for Disease Control and Prevention to be the least efficient mosquito control method. There are several reasons adulticiding is not highly effective. For example, mosquito species have different preferences for flight times and habitats, which makes timing spray events difficult. In areas where there are many houses, trees, and other obstructions, the chance of actually hitting a mosquito with the spray cloud is greatly diminished. Although it is very difficult to measure the efficacy of a large spray event, the results of trap experiments conducted in Houston and Florida suggest that a large spray event will typically reduce the adult population of mosquitoes by only about 30%.

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1. Where did West Nile virus come from?
2. How long has West Nile virus been in the U.S.?
3. I understand West Nile virus was found in "overwintering" mosquitoes. What does this mean?
4. How do people get West Nile encephalitis?
5. If I live in an area where birds or mosquitoes with West Nile virus have been reported and a mosquito bites me, am I likely to get sick?
6. How does West Nile virus actually cause severe illness and death in humans?
7. What proportion of people with severe illness due to West Nile virus die?
8. Is there a vaccine against West Nile encephalitis?
9. Is adulticide an effective means of controlling mosquitos?
10. ¿Se puede tratar el virus del Nilo occidental?
11. ¿Cuál es el riesgo de enfermarse del Virus del Nilo Occidental?
12. ¿Pueden infectarse los animales con el virus del Nilo Occidental?
13. ¿Todos los mosquitos portan el Virus del Nilo Occidental?