Monitoring: Estimate number per leaf. More first generation will be on spur leaves. Most summer generation will be on mid-shoot leaves.

Thresholds: Will vary widely. Threshholds for trees with sparse canopy and heavy crop load is less than for trees with luxurious canopies. Generally, 1-3 per leaf will bleach around the midrib only, 8 per leaf will stipple the entire leaf and create problems for workers at harvest.