How to Manage Pests
UC Pest Management Guidelines
Early Season Monitoring
In this Guideline:
the orchard early in the season as trees come into bloom to help detect
potential pest problems early.
1. Monitor the orchard for plant bug and stink bug
2. Monitor trees for the presence of peach
twig borers, fruittree leafrollers, or obliquebanded leafrollers, katydids, and
western flower thrips (view photos). 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.
- For thrips, examine blossoms
from each tree by slapping a shoot with five to ten blossoms against a yellow
card or look for the immature stages within the blossoms.
Montoring at this time will let you know the effectiveness of the
dormant or bloom treatment and alert you to the need for additional treatment.
||Katydid feeding consists of small holes in the center of young leaves.
||If any of the leaves examined show signs of feeding, treat.
|western flower thrips
||Thrips in the blossoms.
||If a single immature thrips is found, treat.
. . . or . . .
If two blossoms out of 50 sampled have adult thrips, treat.
|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
||If any are present, a treatment is necessary at first flight.
|fruittree leafroller, obliquebanded
||Fruittree leafroller and obliquebanded leafrollers feed on blossoms as well as young foliage and begin to tie leaves together.
||Thresholds have not been determined.
UC IPM Pest Management Guidelines: Nectarine
UC ANR Publication 3451
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
S. Johnson, Pomology, Kearney Agricultural Center, Parlier
J. A. Roncoroni, UC Cooperative Extension, Napa County
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