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How to Manage Pests
UC Pest Management Guidelines
Grape
Grape Bud Beetle
Scientific name: Glyptoscelis squamulata
(Reviewed 6/06,
updated 6/06)
In this Guideline:
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The grape bud beetle is a major pest in the Coachella Valley. It can
be found in the Central Valley but is rarely if ever a pest problem there. The
adults are a light gray color. Both sexes are about 0.25 to 0.4 inch (6–10 mm)
long and 0.2 to 0.25 inch (5–6 mm) wide. There is one generation per year and larval stages are
spent in the soil. Adults begin emerging from the soil in mid-January; peak
emergence occurs around mid-March each year. Emergence
time is not affected by aboveground temperatures.
Adult beetles cause crop loss by feeding on opening buds and
eating the bud center, which contains the immature leaves and flower cluster
primordia. Once the new shoots are 1 to 1.5 inches long, feeding damage is
negligible.
MANAGEMENT
An important part of managing grape bud beetle is keeping accurate
yearly records of infested vineyards. These beetles usually occur in localized
areas of a vineyard year after year. Because grape bud beetles are not equally
distributed, survey all parts of a vineyard.
Monitoring and Treatment
Decisions
Adults come
out of daytime hiding places about 1 hour after sundown. Beetles can be
monitored with a flashlight. An ultra-violet lamp is preferred because the
beetles naturally fluoresce a bright
silvery blue when under UV light.
Treatment decisions for adults are complex. For example,
unusually warm weather can push the buds out rapidly, or cold weather may delay
bud break and provide longer exposure of buds to beetle feeding. A variable
portion of buds of all varieties never open in the Coachella Valley.
During budbreak, treatment is suggested when there are one to
three beetles per vine and bud damage is noticeable in Thompson Seedless
vineyards. Treatment is suggested during budbreak in Beauty Seedless, Perlette,
Flame Seedless, and Cardinal vineyards when there are one to two beetles per
vine and bud damage is noticeable.
| Common name |
Amount/Acre** |
P.H.I.+ |
| (trade name) |
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(days) |
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| The following materials are listed in
order of usefulness in an IPM program, taking into account efficacy and impact on natural enemies and honey bees.
When choosing a pesticide, also consider information relating to environmental impact.
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| A. |
DIMETHOATE 25WP |
6–8 lb |
28 |
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MODE OF ACTION: An organophosphate (Group 1B)1 insecticide.
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COMMENTS: Restricted entry interval: 2 days. Moderately disruptive to beneficials. |
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| B. |
PHOSMET |
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(Imidan) 70WP |
1.33 lb |
7 |
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MODE OF ACTION: An organophosphate (Group
1B)1 insecticide.
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COMMENTS: Restricted entry interval: 5 days |
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UC IPM Pest Management Guidelines: Grape
UC ANR Publication 3448
Insects and Mites
W. J. Bentley, UC IPM Program, Kearney Agricultural Research Center, Parlier
L. G. Varela, UC IPM Program, Sonoma County
F. G. Zalom, Entomology, UC Davis
R. J. Smith, UC Cooperative Extension, Sonoma County
A. H. Purcell, Environmental Science, Policy and Management, UC Berkeley
P. A. Phillips, UC IPM Program, Ventura County
D. R. Haviland, UC IPM Program, Kern County
K. M. Daane, Kearney Agricultural Research Center, Parlier
M. C. Battany, UC Cooperative Extension, San Luis Obispo County
Acknowledgment for contributions to Insects and Mites:
J. Granett, Entomology, UC Davis
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