Pear, Insect Growth Regulator Psylla Test, 1985

Treatments consisted of 0.14 acre blocks replicated 4 times. On 26 Jul 3785 ml/acre of MIT AC 1.5 EC was applied to a psylla population which had developed pyrethroid tolerance to reduce the population prior to randomization of this experiment. Materials were applied by airblast sprayer on 2 Aug, 16 Aug and 29 Aug in 78 gal/acre. At each sample period 25 leaves were randomly selected from the center 4 trees of each block, resulting in 100 leaves per replication (400 per treatment). This sample of 25 leaves from each tree was examined for psylla nymphs using a stereo microscope.