Agriculture: Almond Pest Management Guidelines

Bacterial Spot

Common name Amount per acre REI‡ PHI‡
(Example trade name) (hours) (days)
Not all registered pesticides are listed. The following are ranked with the pesticides having the greatest IPM value listed first—the most effective and least likely to cause resistance are at the top of the table. When choosing a pesticide, consider information relating to the pesticide's properties and application timing, honey bees, and environmental impact. Always read the label of the product being used.
DORMANT
A. COPPER#
(various products) Label rates See label See label
MODE-OF-ACTION GROUP NAME (NUMBER1): Multi-site contact (M1)
. . . OR . . .
COPPER#
(various products) Label rates See label See label
. . . PLUS . . .
NARROW RANGE OIL#
(various products) Label rates See label See label
MODE-OF-ACTION GROUP NAME (NUMBER1): Multi-site contact (M1) + Contact
COMMENTS: Not all copper and oil products are organically acceptable; check labels. Apply 1 to 2 lb metallic copper equivalent (MCE)/acre.
B. MANCOZEB
(Manzate Pro Stick) 4–6.4 lb 24 145
MODE-OF-ACTION GROUP NUMBER1:
COMMENTS: Apply with copper (1–2 lb metallic copper equivalent (MCE)/acre) and 3 to 4.8 lb ai/acre mancozeb. Do not apply more than 19.2 lb of product (14.4 lb ai)/acre per season.
BLOOM AND PETAL FALL
A. COPPER
(various products) Label rates See label See label
MODE-OF-ACTION GROUP NAME (NUMBER1): Multi-site contact (M1)
COMMENTS: Not all copper and oil products are organically acceptable; check with certifier. Apply with reducing rates of copper (1, 0.5, 0.25 lb metallic copper equivalent (MCE)/acre) from full bloom through 5 weeks after petal fall if environmental conditions favor disease.
B. MANCOZEB
(Manzate Pro Stick) 4–6.4 lb 24 145
MODE-OF-ACTION GROUP NUMBER1: Multi-site contact (M3)
COMMENTS: Can be applied alone at 4 to 6.4 lb product/acre (3–4.8 lb ai/acre) or with reducing rates of copper (1, 0.5, 0.25 lb MCE/A) with each application from full bloom through 5 weeks after petal fall if environmental conditions favor disease. Do not apply more than 19.2 lb of product (14.4 lb ai)/acre per season. Full bloom and two petal fall applications (a minimum of 7 days apart) prior to rain events provide excellent control.
C. BACILLUS SUBTILIS strain QST 713
(Serenade Opti, Serenade Optimum) 14–20 oz 4 0
MODE OF ACTION: Biopesticide
COMMENTS: The product is best used under low disease pressure and can be mixed and applied with copper. When using copper, use reducing rates (e.g., 1, 0.5, 0.25 lb metallic copper equivalent (MCE)/acre with each application) from full bloom through 5 weeks after petal fall if environmental conditions favor disease.
D. STREPTOMYCES LYDICUS strain WYEC 108
(Actinovate AG) 3–12 oz 1 0
MODE OF ACTION: Biopesticide
COMMENTS: The product is best used under low disease pressure Applications should be made from full bloom through 5 weeks after petal fall if environmental conditions favor disease.
Restricted entry interval (REI) is the number of hours (unless otherwise noted) from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (PHI) is the number of days from treatment to harvest. In some cases the REI exceeds the PHI. The longer of two intervals is the minimum time that must elapse before harvest.
* Permit required from county agricultural commissioner for purchase or use.
# Acceptable for use on organically grown produce.
1 Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of action. Fungicides with a different group number are suitable to alternate in a resistance management program. In California, make no more than one application of fungicides with mode-of-action group numbers 1, 4, 9, 11, or 17 before rotating to a fungicide with a different mode-of-action group number; for fungicides with other group numbers, make no more than two consecutive applications before rotating to a fungicide with a different mode-of-action group number.
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