This problem is most serious in dry seasons. It becomes a problem when it develops resistance to commonly used pesticides. From bloom through petal fall, examine 50 leaves selected from leaf clusters in the inside of the tree. Treatment is recommended if there is an average of 0.5 nymphs or more per leaf. For the second generation, examine 50 leaves per tree from 10 trees per orchard for nymphs from late July through August.
Treatment is recommended if there is an average of one or more nymphs per leaf.
An additional spray may be needed because of extended egg hatching period. 550 DD first adult emergence. 1,100 DD peak adult emergence. The insects are present on the undersides of the leaves, and thorough coverage by effective chemicals is essential for control. The first generation is best controlled at petal fall.