Which method of mosquito control is not very effective for nuisance prevention?

The effectiveness of mosquito control methods varies based on their application, target, and the timing of use. Residual spray, which involves applying insecticides that remain effective for a period of time on surfaces, is better suited for controlling mosquito populations and providing longer-term results against transmission of diseases, rather than for immediate nuisance prevention.

In contrast, methods such as screening prevent mosquitoes from entering living spaces, while fogging and the use of repellents offer immediate relief from nuisance mosquitoes. Fogging disperses insecticide in the air to quickly reduce mosquito populations in a designated area, while repellents provide a direct barrier against bites for individuals. Therefore, while residual spray is effective for long-term control, it may not address immediate nuisance concerns directly compared to the other methods mentioned. Thus, it is not the optimal choice for nuisance prevention, particularly in scenarios where immediate action is needed to reduce mosquito annoyance.