Abstract
Abstract Tests were conducted on pear seedlings (small nursery liners) growing in 4-inch pots and on elongated fruiting spurs at cluster bud to popcorn stage of development collected from an unsprayed orchard. Seedlings were infested with PP eggs by caging 20 overwintered adults on each for 3 days. One set of seedlings was treated 1 day before adults were caged on them while the other set was treated after oviposition. Fruiting spurs were infested with eggs and a few nymphs when collected. Pesticides were applied to seedlings and spurs by dipping them in test dilutions for 5 s. Four serial dilutions for each IGR were tested. Controls were dipped in water. Treated samples were held in a growth room at ca. 75°C and 16 h photoperiod until most eggs on controls had hatched or until spur foliage began to wilt. Treated spurs were placed in 200 ml beakers with water to keep them fresh. Treatments were applied to single seedlings or 5 spurs. Treatments were evaluated by counting eggs, dead and live nymphs on entire samples using a dissecting microscope.
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