How to Manage Pests
UC Pest Management Guidelines
Fruit Sampling At Harvest
In this Guideline:
Take a fruit sample at harvest to assess the effectiveness of
the current year's IPM program and to determine the needs of next year's
program; be sure to keep a record for each block.
HOW TO SAMPLE
Before the sorting process begins, examine 500 to 1,000 randomly
selected fruit from bins. Plan to sample 500 fruit for each variety unless
unexpected damage is discovered, in which case increase the sample size up to a
maximum of 1,000 fruit in order to thoroughly assess the damage.
Distinguish damage caused by:
- Peach twig borer: shallow feeding
holes; over time these may appear as scabs; also bores into stem end of fruit,
sometimes down to the pit.
- Obliquebanded leafroller: shallow channels in
surface of green or ripe fruit that are accompanied by frass and webbing.
- Green fruitworm: feeding holes that
result in large corky lesions and distorted growth as the fruit enlarge.
- Katydids: shallow-feeding injury that has healed over and
become a corky lesion.
- Shot hole disease: fruit lesions are
light brown with dark purple margins and usually are clustered on the upper
sides of fruit.
fruit rot: dark discoloration and grayish brown
tufts of spore masses form on apricot fruit.
presence of sooty mold.
Record 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 (sample form— ). Note any indication of shot hole, ripe fruit rot,
and sooty mold.
UC IPM Pest Management Guidelines: Apricot
UC ANR Publication 3433
W. J. Bentley (Crop Team Leader), UC IPM Program, Kearney Agricultural Research Center, Parlier
J. L. Caprile, UC Cooperative Extension, Contra Costa County
W. W. Coates, UC Cooperative Extension, San Benito County
K. R. Day, UC Cooperative Extension, Tulare County
K. J. Hembree, UC Cooperative Extension, Fresno County
B. A. Holtz, UC Cooperative Extension, Madera County
R. A. Van Steenwyk, Insect Biology, UC Berkeley
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