Dormant spray applications of insecticides are prohibited if a storm is forecast within how many hours after application?

The correct choice highlights that dormant spray applications of insecticides are prohibited if a storm is forecast within 48 hours of the application. This regulation is in place to mitigate the environmental impact of pesticides. Rainfall within this timeframe can lead to runoff and leaching, which may result in the pesticide contaminating nearby water sources or affecting non-target organisms.

Pesticides applied to dormant plants are intended for specific pests and conditions, so any disturbance caused by subsequent rainfall can not only lessen the effectiveness of the application but also pose risks to ecosystems. The 48-hour window serves as a buffer period to ensure that the pesticides are adequately absorbed and effective before any potential rain can wash them away. This is a crucial practice in pest management and environmental safety that helps maintain compliance with regulations related to pesticide use.