Many insect and disease pests attacking nut trees can be controlled by spray programs, but the selection of pesticides and timing of sprays must be tailored for the type of tree and the specific pests. Detailed pest control information is beyond the scope of this circular.
Powerful equipment is needed to spray large trees adequately.
For the noncommercial grower with a limited number of trees, spraying probably is not practical, except for young trees. Occasionally, foliage diseases or heavy infestations of insects threaten to defoliate the trees. If the trees are young, spraying is suggested. For aphids, malathion at the rate recommended on the label. For fungus diseases of the foliage, such as pecan scab and walnut anthracnose, use benomyl, maneb, or mancozeb at the rates recommended on the label.