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How to Manage Pests
UC Pest Management Guidelines
Citrus
Leaf and Fruit Drop Control Following an Oil Spray
(Reviewed 9/08,
updated 9/08)
In this Guideline:
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| Variety |
Amount to Use |
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| CAUTION: Avoid 2,4-D
spray drift to susceptible plants, which include cotton, grapes, roses,
beans, peas, alfalfa, lettuce, ornamentals, and all broadleaf species. 2,4-D has a 12 hour restricted entry interval. |
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| A. |
ALL |
2.2 ml 2,4-D isopropyl ester formulati on/gal oil |
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COMMENTS: Restricted entry interval
(REI): 12 hours. Used in pesticide oil sprays to counteract leaf drop and
fruit drop caused by the oil. Gives some degree of preharvest fruit drop
control but because of the long time span between most pesticide oil sprays
and the onset of mature fruit drop, the 2,4-D/oil spray may not give adequate
mature fruit drop control, especially if the per acre 2,4-D dosage is less
than 24 grams acid equivalent (60 ml of a formulation containing 3.34 or 3.36
lb of 2,4-D/gal). Under these conditions, an aqueous 2,4-D preharvest spray
may be needed. If the 2,4-D/oil spray occurs within 3–4 months of the
fruit drop period, and if the per acre dosage was at least 24 grams, no
additional 2,4-D should be applied. If the fruit drop period will occur
4–6 months after the 2,4-D/oil spray was applied, apply an aqueous
spray at about 50% of recommended rates for preharvest fruit drop control. If
the fruit drop period will occur more than 6 months after the 2,4-D/oil
spray, apply full rates recommended for preharvest fruit drop control. Apply to trees 6 years and older. Do not apply within 7 days of harvest. |
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UC IPM Pest Management Guidelines: Citrus
UC ANR Publication 3441
Plant Growth Regulators
C. J. Lovatt, Botany and Plant Sciences, UC Riverside
Acknowledgment for contributions to Plant Growth Regulators:
C. W. Coggins, Jr., Botany and Plant Sciences, UC Riverside
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