How to Manage Pests

UC Pest Management Guidelines

Grape

2015 Fungicide Efficacy and Treatment Timing

(Reviewed 7/15, updated 1/16)

In this Guideline:


FUNGICIDE EFFICACY Conventional Chemistry

Fungicide Resistance risk (FRAC#)1 Powdery mildew Downy mildew Rot Phomopsis cane and leaf spot Eutypa dieback Bot Canker Dead Arm (Phomopsis sp.)
Botrytis bunch rot Summer rot
Abound high (11)2 ++++ ++++ + +++ NR
Flint3 high (11)2 ++++ +++ ++ ++ ++ NR
Orius/Tebucon/Toledo/Tebuconazole (Elite/Tebuzol)** high (3) ++++ ++ ++ NR
Quadris Top high (3/11) ++++ + ++ ++ ++ NR
Inspire Super medium (3/9) ++++ ++++ ++ NR
Luna Experience medium (3/7) ++++ ++++ ++ NR
Luna Tranquility*** medium (7/9) ++++ ++++ ++ NR
Mettle high (3) ++++ + NR
Kenja* high (7) ++++ NR NR NR NR NR NR NR
Aprovia* medium (7/11)2 NR NR NR NR NR NR NR NR
Pristine medium (7/11)2 ++++ ++++ ++++ +++ +++ NR
Procure high (3) ++++ NR
Quintec high (13) ++++ NR
Rally high (3) ++++ +++ ++ ++
Rally+Topsin-M5 high (1/3) ++++ ++++ ++++ ++++
Revus Top medium (3/40) ++++ ++++ ++ ++ ++ NR
Rubigan/Vintage high (3) ++++ NR
Sovran high (11)2 ++++ ++++ ++ ++ ++++
Sulfur low (M2) ++++ NR
Rhyme high (3) ++++ NR
Topsin-M/T-Methyl/Incognito high (1)2 ++++ ++ ++ + ++++
Torino high (U6) ++++
Vivando high (U8) ++++
Bayleton** high (3) ++ NR
Copper low (M1) ++ +++ ++ +++ +
Elevate high (17) 2 ++ ++++ ++ NR
Protexio high (17) 2 ++ ++++ ++ NR
Ph-D medium (19) ++ +++ +++ ND NR
Rovral + Oil4 low (2) ++ ++++ NR
Scala high (9)2 ++ ++++ ++ NR
Switch low (9/12) ++ ++++ +++
Vangard high (9)2 ++ ++++ ++ NR
Tavano/Oso medium (19) + +++ +++ ND NR
Botran medium (14) +++
Captan low (M4) + +++ +++ +++ NR
CaptEvate** low (M4/17) + +++ +++ +
Dithane/Manzate/Penncozeb low (M3) ++ +++
Presidio high (43) ++++
Revus high (40) ++++
Ridomil Gold/ (Mefenoxam**) high (4) ++++
Rovral/Iprodione/Nevado low (2) +++
Ziram low (M3) ++ + + +++
Rating: ++++ = excellent and consistent, +++ = good and reliable, ++ = moderate and variable, + = limited and/or erratic, +/- = minimal and often ineffective, — = ineffective; ND = no data and NR = not recommended.
* Registration pending in California.
** Not registered, label withdrawn or inactive in California.
*** Registered only on wine grapes in California.

GRAPEVINE: FUNGICIDE EFFICACY – Soft Chemistry (Biological and Natural Products)

Fungicide Resistance risk (FRAC#)1 Powdery mildew Downy mildew Bunch rot Phomopsis cane and leaf spot Eutypa dieback Bot
Canker
Dead Arm (Phomopsis sp.)
Botrytis Summer
Armicarb low +++
B-Lock* low --- ++++ ++ NR
Cinnacure low +++
Elexa** low +++
JMS Stylet oil4 low +++ +++ ++ NR
Kaligreen low +++
Milstop low +++
Regalia low +++
Taegro low +++ ++ +
Serenade low (44) +++ ++ +
Sonata low +++ ++ NR
Botector low ND +
Purespray low +++
Vintre low +++
Actinovate low ++
Fracture low +++ ++
HiPeak* low ++
Employ* low ++
Prev-am*4 low ++ ++
Sporan low ++
Timorex* 4 low ++
VigorCal* low ++
VigorK* low ++
Double Nickel low + + NR
Sporatec low +
Vitiseal low ++++
* Registration pending in California.
** Not registered, label withdrawn or inactive in California.
Rating: ++++ = excellent and consistent, +++ = good and reliable under low to medium disease pressure (high disease pressure will result in reduced efficacy with a rating of +/++), ++ = moderate and variable, + = limited and/or erratic, +/- = minimal and often ineffective, — = ineffective; and NR = not recommended.
1Group 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 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 fungicide with a different mode-of-action Group number.
2To 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/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).

GRAPEVINE: TREATMENT TIMING

Note: Not all indicated timings may be necessary for disease control.

Disease Dormant Budbreak Full bloom Pre-close Veraison Preharvest/Postharvest5
Botryosphaeria canker (Bot canker) +++
Botrytis Bunch Rot +++2 +++1 +++1 +++1 +++1
Brown spot +++ +++ +++
Dead arm +++ +++
Downy mildew +++ +++
Esca (Black measles) +++2
Eutypa Dieback +++
Powdery mildew +++2 +++3 +++3 +++4
Phomopsis +++ +++
Summer bunch rot (sour rot) +++1 +++1
Rating: +++ = most effective, ++ = moderately effective, + = least effective, and — = 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.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Grape
UC ANR Publication 3448

General Information

Adaskaveg, J. E., B. A. Holtz, T. J. Michailides, and W. D. Gubler. 2015. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (PDF)

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