Since the seedling did not line up with the rest of the trees in the row, Hart cut it down. The following year it came up again, and again he cut it down. The third year that it appeared, Hart decided that if it wanted to live that badly, he would let it stay. IPM is a system that combines many pest control measures, and does not rely only on chemicals. Apple growers fight this pest with the use of pheromones, biocontrol agents, and release of sterile males.
Growers tie pheromone dispensers on trees to confuse codling moth males.
The dispensers flood orchards with so much synthetic female moth scent that males find it all but impossible to find a potential mate. As a result of this confusion, females don't get mated, their eggs are not fertilized, and the population crashes. Because insecticides are not used, the natural insect enemies of other pests, such as leafrollers, pear psylla, aphids, and leafminers, are not killed, and thus are able to prey on these pests. USDA-ARS Photo courtesy of Jim Stefon John Chapman was born in 1774 in Massachusetts. By the time he was 25 years old, he had become a nursery man and had planted apple trees in the western portions of New York and Pennsylvania.