GRAPEVINE: FUNGICIDE EFFICACY – CONVENTIONAL

Rating: 5 = excellent and consistent, 4 = good and reliable, 3 = moderate and variable, 2 = limited and/or erratic, 1 = minimal and often ineffective, 0 = ineffective, NL = not on label, and ND = no data.

* Registration pending in California.

** Not registered, label withdrawn or inactive in California.

*** Registered only on wine/raison grapes in California.

GRAPEVINE: FUNGICIDE EFFICACY – BIOCONTROLS AND NATURAL PRODUCTS

* Registration pending in California.

** Not registered, label withdrawn or inactive in California.

Rating: 5 = excellent and consistent, 4 = good and reliable under low to medium disease pressure (high disease pressure will result in reduced efficacy with a rating of +/++), 3 = moderate and variable, 2 = limited and/or erratic, 1 = minimal and often ineffective, 0= ineffective; and NL = not on label; ND = No data.

¹ Code numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of actions (for more information, see http://www.frac.info/). Fungicides with a different Code number are suitable to alternate in a resistance management program. In California, make no more than one application of fungicides with mode-of-actions (MOA) with high resistance risk before rotating to a fungicide with a different MOA (Code number); for other fungicides, make no more than two consecutive applications before rotating to fungicide with a different MOA (Code number).

² To reduce the risk of resistance development, start treatments with a fungicide with a multi-site mode of action; rotate or mix fungicides with different mode of action FRAC numbers for subsequent applications, use labeled rates (preferably the upper range), and limit the total number of applications per season.

³ Causes severe phytotoxicity on Concord grape.

⁴ Phytotoxic if used within 2 weeks of Captan or sulfur.

⁵ Tank mixture applied post-pruning (dormant or delayed dormant).

⁶ Apply at two-week intervals during rain events.

⁷ Different use restrictions for ‘Table and Raisin’ and ‘Wine’ grape. Please read the label carefully.

⁸ Labeled for Eutypa sp., Botryosphaeria sp., Cytospora sp., and other trunk diseases of grape.

GRAPEVINE: TREATMENT TIMING

Rating: 3 = most effective, 2 = moderately effective, 1 = least effective, and 0 = ineffective.

¹ Apply only if rain is forecasted.

² Use 10 gallons lime sulfur per acre in at least 100 gallons water.

³ Apply bud break and full bloom treatments every year.

⁴ Apply as needed (a disease risk assessment model is available to help determine need for spray).

⁵ Preharvest treatments for postharvest decay control.

GRAPEVINES: SUGGESTED DISEASE MANAGEMENT PROGRAMS BY FRAC¹ CODES - CONVENTIONAL AND ORGANIC GROWERS

Note: Not all indicated timings may be necessary for disease control (see Treatment Timing Table). If treatments are needed based on weather monitoring or environmental monitoring models, suggested fungicide codes are listed for each timing.

How to use this table:

1) Identify the disease(s) that need(s) to be managed. Know the disease history of the orchard especially from the previous season.

2) Select one of the suggested fungicide Codes. Numbers separated by slashes are premixtures, whereas numbers grouped by pluses are tank mixtures. If several diseases need to be managed, select a Code that is effective against all diseases. Refer to fungicide efficacy table for fungicides belonging to each FRAC Code. Code numbers are listed in numerical order within the suggested disease management program.

3) Rotate Codes for each application within a season and, if possible, use each Code only once per season, except for multi-site mode-of-action materials or natural products/biological controls (i.e., M2, BM 01, BM 02, NC).

¹ Code numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of actions (for more information, see http://www.frac.info/). Code numbers are listed in numerical order within the suggested disease management program. Fungicides with a different Code number are suitable to alternate in a resistance management program. Refer to the fungicide efficacy table for fungicides belonging to each FRAC Code. FRAC Codes = BM 01 (Natural Products - B-Lock, Cinnacure), BM 02 (Biological Controls - Sonata, Serenade,), and NC (Kaligreen, etc.)

² Apply only if rain is forecasted. When using one class do not follow with the same class.

³ Use 10 gallons lime sulfur per acre in at least 100 gallons water. Use liquid lime sulfur in dormant applications and wettable sulfur at and after prebloom.

⁴ Apply bud break and full bloom treatments every year.

⁵ Apply as needed (a disease risk assessment model is available to help determine need for spray).

⁶ Apply when insect and bird damage is present or when rainfall is f