Aphids can be controlled with sprays of malathion.
Borers such as flat-headed appletree borer or two-lined chestnut borer bore into trees weakened by some stress. Prevent the insect infestations by keeping trees healthy with regular fertilization.
Regular inspections of the trunk and branches are suggested for early detection of scales. Control scales with Diazinon, Sevin, or malathion when the crawlers are active. Identify the specific scale involved to time the sprays properly.
Certain caterpillars can be controlled with sprays of Bacillus thuringiensis. Insect identification allows proper spray recommendations to be made.