How long does the Birch Leaf Miner pupal stage last in May?

The Birch Leaf Miner (Fenusa pusilla) has a pupal stage that typically lasts between 8 to 15 days in May. During this period, the larvae transform within the leaf tissue, ultimately emerging as adult miners. This timing aligns with the lifecycle of the pest, which is characterized by its development in the spring months.

Understanding the duration of the pupal stage is essential for effective pest management. By knowing when this stage occurs, applicators can time their interventions more effectively, ensuring the application of control measures coincides with the emergence of adults and the potential for further damage to birch trees.

The other timeframes do not accurately represent the established knowledge of the Birch Leaf Miner's pupal duration, which is why they are not the correct answers.