Most borers are only capable of attacking trees that are stressed due to drought, injury or disease.
Consequently any means of promoting vigorous tree growth should be considered the primary approach for borer management. Trees that are only marginally adapted to Colorado conditions or those that are shallow rooted and subject to winter drought can have chronic borer problems. Infestations of pinyon borers are thought to be related to excessive watering and rainfall that allows increased cracking in stems and trunks. Borers within trees cannot be successfully treated with insecticides because the insects are ina protected site. Insecticidal control is best achieved if sprays aremade during periods of adult activity and egg laying.