CDFA Pest Prevention Plant Regulation Practice Exam

What stage does the pine-shoot moth overwinter in?

1. Adult Stage

2. Egg Stage

3. Pupal Stage

4. Larval Stage

The correct answer is: Larval Stage

The pine-shoot moth overwinter primarily in the larval stage. This is a critical period for the pest, as it seeks refuge in the buds or bark of pine trees to survive harsh winter conditions. During this time, the larvae are protected from extreme temperatures and other environmental stressors. This ability to overwinter as larvae allows the pine-shoot moth to emerge in the spring when conditions are favorable for feeding and reproduction, thus significantly contributing to its life cycle and population sustainability. In contrast, other stages like the adult, egg, or pupal stages do not offer the same level of protection and resilience needed to survive the winter months. While adults may be present in early spring, they do not overwinter, and eggs need a host tree for developing but are laid in the spring to ensure survival capabilities. The pupal stage, on the other hand, occurs within cocoons and typically does not overwinter, as it transitions to the adult stage. Hence, the larval stage is the most relevant for the pine-shoot moth's overwintering strategy.