What is the life cycle duration of Pine Sawfly larvae before they defoliate needles?

The life cycle duration of Pine Sawfly larvae before they begin to defoliate needles is typically in the range of 25 to 31 days. This timeframe is crucial for understanding the progression of their lifecycle, as it highlights when significant damage may occur to pine trees. The larvae feed on the needles of host pine species, and their feeding can lead to noticeable defoliation, which can affect the health and growth of the trees.

The 25 to 31-day period allows the larvae to grow and develop adequately before they start causing visible harm, which is critical knowledge for pesticide applicators who need to time their interventions effectively to manage these pests. Recognizing this life cycle duration can help in scheduling the application of control measures before significant defoliation occurs, which is vital for maintaining the health of pine trees in various landscapes.