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How to Manage Pests
UC Pest Management Guidelines
Citrus
Yuma Spider Mite
Scientific Name: Eotetranychus yumensis
(Reviewed 7/03,
updated 7/03)
In this Guideline:
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DESCRIPTION OF THE PEST
The Yuma spider mite occurs on grapefruit and lemon in the Coachella and
Imperial valleys. It is similar in shape to the citrus red mite but is light
straw to dark pink colored and produces substantial webbing on the underside of
leaves. It feeds and lays peach-colored eggs under the webbing. Yuma spider
mites are most numerous in winter and late spring.
DAMAGE
This mite may cause some leaf drop.
MANAGEMENT
Generally damage from Yuma spider mites is not severe enough to warrant
treatment. If monitoring indicates a treatment is necessary, sulfur may
only be applied during the period from October to March 15, whereas dicofol
can be applied anytime during the year.
Common name
(trade name) |
Amount to Use
(type of coverage)** |
Minimum Days
before Harvest+ |
|
| A. |
WETTABLE SULFUR# |
60 lb/acre (OC or TDC) |
1 |
| |
RANGE OF ACTIVITY:
Narrow (mites and citrus thrips) |
| |
PERSISTENCE: Intermediate |
| |
COMMENTS: For use on all varieties. Apply from Nov thru
May when monitoring indicates a need. Do not apply more than 6 lb/100
gal water. Do not apply during or preceding high temperatures. Do
not apply sulfur within 2 months of a previous oil spray, and do not
apply oil 60-90 days after a sulfur treatment. Not recommended for
use in the San Joaquin Valley. |
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| B. |
DICOFOL |
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| |
(Kelthane MF) 4E |
0.8 pt/100 gal (TDC) |
7 |
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RANGE OF ACTIVITY:
Narrow (pest and beneficial mites) |
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PERSISTENCE: Long |
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COMMENTS: For use on all varieties. Closed application
system required with this material. Can cause secondary outbreaks
of citrus red mites. Do not exceed 6 pt/acre. |
| ** |
TDC - Thorough distribution coverage
uses 500-3,000 gal/acre, but less than thorough coverage (TC). |
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OC - Outside coverage uses 50-500 gal
water/acre |
| + |
Minimum days before harvest takes into
account the California restricted entry interval and the federal preharvest
interval and lists the longer interval. (See Table 1 Mandatory
Intervals Between Application, Reentry and Harvest, and Hazards to
Bees.) |
| # |
Acceptable for use on organically grown
produce. |
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UC IPM Pest Management Guidelines: Citrus
UC ANR Publication 3441
Insects, Mites, and Snails
E. E. Grafton-Cardwell, Kearney Agricultural Center, Parlier
J. G. Morse, Entomology, UC Riverside
N. V. O’Connell, UC Cooperative Extension, Tulare Co.
P. A. Phillips, UC IPM Program, UC Cooperative Extension, Ventura Co.
C. E. Kallsen, UC Cooperative Extension, Kern Co.
D. R. Haviland, UC Cooperative Extension, Kern Co.
Acknowledgments for contributions to the insect, mite, and snail section:
J. Barcinas, E. S. I., Corona, CA
R. Dunn, Badger Farming Co., Exeter, CA
J. Gorden, Pest Management Associates, Exeter, CA
H. Griffiths, E. S. I., Corona, CA
D. Machlitt, Consulting Entomology Services, Moorpark, CA
C. Musgrove, retired entomologist, Riverside, CA
K. Olsen, S & J Ranch, Pinedale, CA
T. Roberts, E. S. I., Corona, CA
J. Stewart, Pest Management Associates, Exeter, CA
P. Washburn, Washburn & Sons Citrus Pest Control, Riverside, CA
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