How to Manage Pests
UC Pest Management Guidelines
Plum rust mite: Aculus fockeui
Big-beaked plum mite: Diptacus gigantorhynchus
and others in the genus Eriophyes
In this Guideline:
Eriophyid mites are tiny,
microscopic mites that have two pairs of legs near the anterior end of the
body. They are yellow to pinkish white to purplish in color, and wedge-shaped
with the widest part of the body being just behind the head.
All species feed on leaves. Heavily infested leaves take on a
silvery or bronze appearance, depending on the species. Severe infestations can
interfere with photosynthesis, but research indicates that populations as high
as 120 eriophyid mites per leaf do not impact yield during the year of
Eriophyid mites are more likely to reach high densities in sprayed
orchards where predaceous mites are destroyed.
Light to moderate populations are suppressed by predaceous
Biological control and sulfur sprays are acceptable
for use on organically certified produce.
Treatments are only recommended in orchards with
chronic infestations or when there is a danger of defoliation.
||Amount to Use**
|The following materials are listed in order of usefulness
in an IPM program, taking into account efficacy, impact
on natural enemies and honey bees, and impact
of timing on beneficials. When choosing a
pesticide, also consider information relating to environmental impact. Not all registered pesticides are listed. Always read label of product being used.
||or SULFUR DUST#
||MODE OF ACTION: Unknown. An inorganic insecticide.
||COMMENTS: Do not apply within 2 weeks of oil spray.
OF ACTION GROUP NUMBER1: 12B
||COMMENTS: Do not apply more than twice a season.
UC IPM Pest Management Guidelines: Plum
UC ANR Publication 3462
Insects and Mites
W. J. Bentley, UC IPM Program, Kearney Agricultural Center, Parlier
K. R. Day, UC Cooperative Extension, Tulare County
Acknowledgment for contributions to Insects and Mites:
R. E. Rice, Kearney Agricultural Center, Parlier
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