How to Manage Pests
UC Pest Management Guidelines
In this Guideline:
Monitor the orchard early in the season as trees come into bloom
to help detect potential pest problems.
the orchard ground cover with a sweep net for plant bug, stink bug, thrips,
and katydid populations (view photos of ground cover pests).
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
||What to look for
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
||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.
||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.
|western flower thrips
||Thrips in blossom.
or five blossoms out of 50 sampled have mature thrips, treat;
. . . or . . .
If more than three blossoms are found with immature thrips, treat.
UC IPM Pest Management Guidelines: Peach
UC ANR Publication 3454
W. J. Bentley (Crop Team Leader), UC IPM Program, Kearney Agricultural Center, Parlier
K. R. Day, UC Cooperative Extension Tulare County
R. A. Duncan, UC Cooperative Extension Stanislaus County
J. K. Hasey, UC Cooperative Extension Sutter/Yuba counties
S. Johnson, Pomology, Kearney Agricultural Center, Parlier
J. A. Roncoroni, UC Cooperative Extension Napa County
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