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How to Manage Pests
UC Pest Management Guidelines
Citrus
Broad Mite
Scientific Name: Polyphagotarsonemus latus
(Reviewed 7/03,
updated 7/03)
In this Guideline:
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DESCRIPTION OF THE PEST
Broad mites are often found in
depressions on fruit where the females lay their
eggs, which are dimpled, translucent,
and white. These mites are so small you need a hand lens to see them. Broad
mites are yellowish in color and adults females have a white stripe on the
back.
DAMAGE
Broad mites feed on fruit and leaves, preferring
young fruit up to about 1 inch (2.5 cm)
in diameter that are located on the inside of the canopy. Feeding results in
scarred tissue that cracks as fruit
grows, leaving a characteristic pattern of scars and new tissue. Although most
feeding occurs on fruit, broad mites may also feed on young expanding leaves
causing them to curl. This cupping
and curling of leaves can appear similar to mild damage caused by
glyphosate-Roundup applications.
MANAGEMENT
Broad mites are occasional pests of coastal lemons from late July through early
October; infestations are enhanced by the presence of
Argentine ants. No monitoring or
treatment guidelines have been developed for this mite in citrus. If high and
increasing populations warrant treatment, use miticides with the least toxicity
to predaceous mites.
Common name
(trade name) |
Amount to Use
(type of coverage)** |
Minimum Days
before Harvest+ |
|
| A. |
ABAMECTIN* |
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(AgriMek) 0.15 EC |
5 fl oz/acre (TDC) |
7 |
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...PLUS... |
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NARROW RANGE OIL |
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(415) |
1.4% |
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RANGE OF ACTIVITY:
Narrow (citrus thrips, mites) |
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PERSISTENCE: Short |
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COMMENTS: For use on all varieties. |
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| B. |
WETTABLE SULFUR# |
3-4 lb/100 gal (TDC) |
1 |
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RANGE OF ACTIVITY:
Narrow (mites and citrus thrips) |
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PERSISTENCE: Intermediate |
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COMMENTS: For use on all varieties. Apply as mites appear;
avoid applications during or preceding high temperatures. Do not apply
sulfur within 2 months of a previous oil spray or apply oil 60-90
days after a sulfur treatment. |
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| C. |
DICOFOL |
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(Kelthane MF) 4E |
0.6-0.8 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; do not apply during
bloom. Can cause secondary outbreak of citrus red mite. Closed application
system required with this material. Do not exceed 6 pt/acre. |
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| D. |
CHLORPYRIFOS* |
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(Lorsban) 4E |
0.75 pt/100 gal (TDC) |
See comments below |
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in 1200-1600 gal |
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RANGE OF ACTIVITY:
Broad (insects and beneficial mites) |
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PERSISTENCE: Intermediate |
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COMMENTS: For use on all varieties. Do not apply during
bloom and no more than 2 applications/year at least 30 days apart.
Minimum period before harvest is 21 days up to 7 pt/acre, 35 days
above 7 pt/acre. |
| ** |
TDC - Thorough distribution coverage
uses 500-3,000 gal/acre, but less than thorough coverage (TC) |
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LV - Low-volume uses 20-100 gal/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. |
| * |
Permit required from county agricultural
commissioner for purchase or use. |
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. OConnell, 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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