How to Manage Pests
UC Pest Management Guidelines
Scientific Name: Synanthedon exitiosa
(Reviewed 6/10, updated 6/10, pesticides updated 9/15, corrected 1/19)
In this Guideline:
Description of the Pest
Gum exuding from around the base of the trunk is evidence of peachtree borer. Larvae of the peachtree borer, found mainly in coastal areas and in the northern San Joaquin Valley, are white with brown heads. Adults are clear-winged moths with blue-black bodies having yellow or orange bands across the abdomen. The adult peachtree borer may be found from May to September, with larvae present in the tree the rest of the year. There is only one generation each year.
This wood-boring insect can successfully attack healthy trees. The larval stage bores into the crown and trunk of the tree and mines the cambial layer. If this occurs for several years, the tree may eventually become girdled and die.
Apply insecticides when adults emerge in May and again 6 weeks later. Pheromone traps are available to monitor adult emergence. Insecticides are not likely to kill larvae within the tree but will protect against reinfestation as emerged adults lay new eggs on the trunk. Results may not be evident until the following season.
UC IPM Pest Management Guidelines:
Insects and Mites
K. R. Day, UC Cooperative Extension, Tulare County
Acknowledgment for contributions to Insects and Mites:W. J. Bentley, UC IPM Program, Kearney Agricultural Center, Parlier
R. E. Rice, Kearney Agricultural Center, Parlier