UC IPM Online UC ANR home page UC IPM home page

UC IPM Home

SKIP navigation

 

How to Manage Pests

UC Pest Management Guidelines


Plum

Fruit Evaluation at Harvest

(Reviewed 5/06, updated 5/06)

In this Guideline:


Take a fruit damage sample at harvest to assess the effectiveness of the current year's IPM program and to determine the needs of next year's program.

Use monitoring form (112 KB, PDF) with detailed treatment threshold information.

HOW TO SAMPLE

During the sorting process in the orchard randomly examine 100 fresh fruit from each bin for each variety. Distinguish damage caused by peach twig borer, obliquebanded and omnivorous leafrollers, codling moth, and San Jose scale.

Look for the presence of:

  • Larvae or larval feeding from peach twig borer, codling moth or other caterpillars
    • Peach twig borer: shallow feeding holes; over time these may appear as scabs.
    • Codling moth: piles of frass at entrance holes; tunnel deep into fruit.
    • Leafrollers: tunneling into fruit; shallow holes or grooves in the fruit surface.
  • Look for the presence of live or parasitized San Jose scale and halos or spots on the fruit surface.

Record on a sampling form the number of fruit infested by larvae, type of larvae present or, if there are no larvae present, whether damage is surface feeding only or if the larvae penetrated the fruit. Record the number of fruit with live San Jose scale or parasitized San Jose scale. Note that you may also see signs of ripe fruit rot.

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Plum
UC ANR Publication 3462
General Information

Top of page


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/r611900911.html revised: April 25, 2014. Contact webmaster.