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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Larva of peach twig borer.

Peach

Early Season Monitoring

(Reviewed 3/06, updated 3/06)

In this Guideline:

Monitor the orchard early in the season as trees come into bloom to help detect potential pest problems.

1. Sample the orchard ground cover with a sweep net for plant bug, stink bug, and katydid populations (view photos of ground cover pests).

2. Monitor trees for the presence of peach twig borers, fruittree leafrollers, or obliquebanded leafrollers, and katydids (view photos of leafrollers and katydids). Examine flowers and leaves on 2- to 3-year-old branches located at head height on each of 50 trees as you walk through each varietal block. For peach twig borers and leafrollers, pull off a few flowers and examine for feeding, holes, or the presence of caterpillars. For katydids, spend about 30 seconds examining leaves for feeding damage. Monitoring at this time will let you know the effectiveness of the dormant or bloom treatment and alert you to the need for additional treatment.

Pest What to look for Treatment Threshold
Peach twig borer larvae At this time peach twig borers feed at the base of flowers where they bore into the calyx, creating small holes. They may also enter the tips of shoots causing them to wilt (see SHOOT STRIKE MONITORING). If any are present, a treatment is necessary at first flight.
Fruittree leafroller, Obliquebanded leafroller Fruittree leafroller and obliquebanded leafrollers feed on blossoms as well as the young foliage and begin to tie leaves together. Thresholds have not been determined.
Katydids Katydid feeding consists of small holes in the center of young leaves. If any of the leaves examined show signs of feeding, a treatment may be warranted.

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Peach
UC ANR Publication 3454
General Information
C. Pickel, UC IPM Program, Sutter/Yuba counties
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

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