Borers

The most common species of bark and tree borers of pome and stone fruit include Coleopteran species belonging to the families Buprestidae, Cerambycidae, and Scolytidae and Lepidopteran species belonging to the family Sesiidae. Larvae damage trees by feeding on or beneath bark within the cambial layer of wood; feeding can take place in or on roots, trunks, or limbs, depending on species. Often, eggs are laid at sites of injury or in cracks on bark of trees. Signs of infestation include frass, sawdust, and gum. Larval feeding often facilitates entry of secondary insect and disease problems. Infested trees become less productive with steady declines in vigor and yield. Depending on the species and level of infestation, trees can be lost. Monitoring for Sesiidae species often involves the use of pheromone traps to capture female-seeking adult male moths. However, signs of frass, sawdust, and gum are also good indicators of infestation. Mating disruption is available as a control strategy for several Sesiidae species, but for most, insecticide sprays directed at the trunk and scaffold limbs are used for control. However, control maybe difficult if larvae feed on roots or deep within wood.

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