|
|
How to Manage Pests
UC Pest Management Guidelines
Citrus
Leaf and Fruit Drop Control Following an Oil Spray
(Reviewed 7/03,
updated 7/03)
In this Guideline:
|
|
|
| Variety |
Amount to Use |
|
| CAUTION: Avoid 2,4-D spray drift to susceptible
plants, which include cotton, grapes, roses, beans, peas, alfalfa,
lettuce, ornamentals, and all broadleaf species. |
| |
|
| A. |
ALL |
2.2 ml 2,4-D isopropyl ester formulation/gal
oil |
| |
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. |
![[Precautions]](/IMAGES/btn-precautions_bul.gif)
![[UC Peer Reviewed]](/IMAGES/logo-ucpeerreviewed.jpg)
UC IPM Pest Management Guidelines: Citrus
UC ANR Publication 3441
Plant Growth Regulators
C. W. Coggins, Jr., Botany and Plant Sciences, UC Riverside
C. J. Lovatt, Botany and Plant Sciences, UC Riverside
Top of page
|
