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The insects can cause significant damage to crops, feasting on apples, peaches, grapes, corn, tomatoes and soybeans, Ms. Leskey said. This year’s damage estimates are not available because the harvesting season is still under way, she said.

At the Appalachian Fruit Station, entomologists are keeping growers informed of a potentially sizable brown marmorated stink bug population that could be munching on crops next spring. To monitor the population, researchers have identified and synthesized a pheromone that attracts male and female brown marmorated stink bugs to traps.

“This way, the grower doesn’t have to scout the entire orchard; he or she just has to look at the trap,” Ms. Leskey said.

Jayson Harper, a professor of agricultural economics at Pennsylvania State University, said growers need to spray more insecticides on fruits and vegetables to eliminate stink bugs.

“At the end of the season, we used to spray fruits and vegetables with just fungicide. Now we have to use insecticides,” Mr. Harper said.