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Petal Fall, First through Fifth Covers
Diseases. Leaf and fruit spot, scab, powdery mildew, sooty blotch, fruit rots, sooty mold.
Insects. Pear psylla, plum curculio, plant bugs, codling moth, Oriental fruit moth, mites.
Pear psylla. Where psylla persist or increase, shorten the interval between two successive cover sprays to 5 to 7 days. Azinphos-methyl, Imidan, and Lannate are not effective in controlling psylla.
Note: The insecticide rates suggested below are rates needed for pear psylla control. If psylla is not a problem, reduce rates by 25 percent.
Sooty mold. Control is based on control of aphids and pear psylla.
Note: Apply the first cover spray 10 days after petal fall and the remaining cover sprays at 14-day intervals.
Mites. Use one of the following for mite control. Mite injury on pears mimics fire blight injury. Several miticide options are given. The miticide chosen and its rate should be based on the size of the mite population, the number of predators present, and the degree of resistance in particular orchard blocks. Miticides should be selected according to their efficacy against individual pests (see Table 4-11).
Pesticide Recommendations for Pears, Petal Fall, First through Fifth Covers