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How to Manage Pests
UC Pest Management Guidelines
Cotton
Monitoring Spider Mites, Aphids, and
Thrips (Seedling Cotton)
(Reviewed 2/05,
updated 2/05)
In this Guideline:
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Start sampling for aphids, spider mites,
and thrips as soon as plants emerge. Walk the fields once or twice a week,
looking for the pests and their damage.
WHEN AND HOW TO SAMPLE
- Sample once or twice a week
- Walk down rows in four quadrants of the field
- Use a hand lens to examine the first true leaves or cotyledons of random plants looking for damage and insects and mites
TREATMENT THRESHOLDS
- Thrips: No treatment is generally required. Treat for thrips only if plants show poor growth, there is terminal damage,
and thrips are present in significant numbers.
- Mites: Treat for mites if defoliation is occurring and the mite populations are high.
- Aphids: Treat for aphids if high populations persist for 7 or more days.
Go to the specific pest sections for more information on when to treat and
treatment options.
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UC IPM Pest Management Guidelines: Cotton
UC ANR Publication 3444
General Information
L. D. Godfrey, Entomology, UC Davis
P. B. Goodell, UC IPM Program/ Kearney Agricultural Center, Parlier
E. T. Natwick, UC Cooperative Extension, Imperial County
D. R. Haviland, UC IPM Program, Kern County
Acknowledgment for contributions to Insects and Mites:
E. E. Grafton-Cardwell, Kearney Agricultural Center, Parlier
N. C. Toscano, Entomology, UC Riverside
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