Pear psylla is not an individual orchardist’s problem—it is a neighborhood issue. The pest disperses in the winter and flies back into orchards in the spring. No matter how well growers have controlled pear psylla the previous year, they start the following season with the same problem as every other grower in the neighborhood, Tim Smith, Washington State University Extension educator, reminded growers at the North Central Washington Pear Day. “Psylla are flying up and down the valley,” he said. “Whether you’re a good manager, or a bad manager, you will have the same number in March.” That’s why an […]