What weather conditions favor an increase in fall armyworm populations?

The correct answer indicates that warm and humid weather conditions favor an increase in fall armyworm populations. Fall armyworms thrive and reproduce more effectively in environments where temperatures are warm, typically ranging between 70°F and 95°F, coupled with higher humidity levels. These conditions provide an optimal habitat for their growth, allowing them to feed on a variety of host plants and complete their life cycle more quickly.

In addition, high humidity levels can enhance moisture availability, which not only benefits the fall armyworms directly but can also support the growth of their preferred host plants. This creates a favorable ecosystem for the armyworms to multiply and spread, increasing their population density.

In contrast, cool and wet conditions, while they may provide some level of moisture, do not offer the warmth necessary for the fall armyworms to thrive. Similarly, hot and dry conditions can be detrimental as extreme heat and lack of moisture can lead to the desiccation of both the pests and their host plants. Windy and dry conditions can negatively impact the movement and establishment of the fall armyworm populations as well, making warm and humid situations the most conducive for their proliferation.