Dave Horton, USDA-Yakima
late winter when the insects are returning to the orchard. Horton plans to test the response of both winterform and sum- merform psylla to the repellent on caged pear trees.
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Scientists are testing traps with pheromone lures to find out if they could be used to disrupt mating of pear psylla in the spring and delay egg laying.
www.goodfruit.com
GOOD FRUIT GROWER APRIL 15, 2012 15
photo by christelle guédot
