(separation of flower buds, but before petal show)
Insects. Pear psylla, plant bug, stink bug, pear midge, pear rust mite.
Pear psylla. Excellent psylla control has been achieved in the green cluster bud spray when an insecticide was used with oil. If pear psylla is not a problem, reduce the insecticide rate by 25 percent.