2 All-purpose spray mixtures for peach and nectarine pest control are available in small packages at garden supply stores. Most important sprays. Presence of borers is indicated when masses of gum containing red-brown larval droppings and sawdust are found on tree trunks near the ground. This is in contrast to clear gum deposits caused by cracking of the bark and mechanical wounds. Borers destroy the inner bark of trees from slightly below the soil surface to 10 inches above the soil line.
Damaged trees become unthrifty and produce off-color foliage.
Trees attacked by borers frequently die within a few years. Full-grown larvae attain a length of approximately 1 inch. The ideal time to treat for borers is early mid-September. Treat each year whether or not signs of borers are observed. A sprinkler-can makes an ideal mixing container.