What factor can enhance a pesticide's effectiveness during application?

High humidity and temperature can significantly enhance a pesticide's effectiveness during application. When the humidity is high, it can help to reduce the evaporation rate of the pesticide, allowing more time for it to adhere to the target surface and be absorbed by the pests. Higher temperatures can also increase the activity level of both the pesticide and the pest, which may lead to better penetration and efficacy of the chemical being applied. Together, these environmental conditions can create a more favorable atmosphere for the pesticide to perform its function effectively.

In contrast, low wind speeds are also beneficial because they minimize drift, but humidity and temperature tend to have a more direct impact on the biological activity of the pesticide and pests. Using outdated pesticides compromises effectiveness due to potential degradation of the active ingredients, while incorrect nozzle size alters the distribution and coverage of the pesticide, decreasing overall efficacy.