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How to Manage Pests

UC Pest Management Guidelines

Peachtree borer, location of infestation on tree.


Peachtree Borer

Scientific name: Synanthedon exitiosa

(Reviewed 4/10, updated 4/10)

In this Guideline:


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.

Common name Amount/Acre** R.E.I.+ P.H.I.+
(trade name) (conc.) (dilute) (hours) (days)

  Calculate impact of pesticide on air quality
The following materials are listed in order of usefulness in an IPM program, taking into account efficacy, impact on natural enemies and honey bees, and impact of the timing on beneficials. When choosing a pesticide, also consider information relating to environmental impact. Not all registered pesticides are listed. Always read label of product being used.
  (Asana XL) 4.8–14.5 fl oz 2–5.8 fl oz 12 14
  COMMENTS: Apply as a directed trunk and scaffold limb spray. Thorough coverage of trunk and scaffolds is required. In dilute application, do not apply more than 200 gal water/acre at the 5.8 fl oz rate.
  (Lorsban Advanced) 3 qt/100 gal 4 days 14
  COMMENTS: Do not apply more than once per year.
  (Isomate-P Pheromone) Label rates 0 0
  COMMENTS: While not tested in California, mating disruption has been used in the eastern U.S.
** For dilute applications, rate is per 100 gal water to be applied in 300-500 gal water/acre, according to label; for concentrate applications, use 80-100 gal water/acre, or lower if the label allows.
+ Restricted entry interval (R.E.I.) is the number of hours (unless otherwise noted) from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (P.H.I.) is the number of days from treatment to harvest. In some cases the REI exceeds the PHI. The longer of two intervals is the minimum time that must elapse before harvest.
* Permit required from county agricultural commissioner for purchase or use.
# Acceptable for use on organically grown produce.
1 Rotate chemicals with a different mode-of-action Group number, and do not use products with the same mode-of-action Group number more than twice per season to help prevent the development of resistance. For example, the organophosphates have a Group number of 1B; chemicals with a 1B Group number should be alternated with chemicals that have a Group number other than 1B. Mode of action Group numbers are assigned by IRAC (Insecticide Resistance Action Committee). For additional information, see their Web site at http://www.irac-online.org/.



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Peach
UC ANR Publication 3454
Insects and Mites
W. J. Bentley, UC IPM Program, Kearney Agricultural Center, Parlier
J. K. Hasey, UC Cooperative Extension, Sutter/Yuba counties
K. R. Day, UC Cooperative Extension, Tulare County
Acknowledgment for contributions to the Insects and Mites:
R. E. Rice, Kearney Agricultural Center, Parlier
C. Pickel, UC IPM Program, Sutter/Yuba counties

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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