How to Manage Pests

UC Pest Management Guidelines


2017 Fungicide Efficacy and Treatment Timing

(Reviewed 6/17, updated 6/17, corrected 7/18)

In this Guideline:


Fungicide Resistance risk (FRAC number)1 Botrytis Fruit Rot
Scholar*** high (12) +++
Oso medium (19) +++
Vangard2 high (9)3 +++
Rating:         ++++ = excellent and consistent, +++ = good and reliable,  ++ = moderate and variable, + = limited and/or erratic, +/- = minimal and often ineffective, ---- = ineffective; and NR = not recommended
*** Scholar is for postharvest use only.
1 Group numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of actions. 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.
2 Vangard preharvest registration for California is approved for the 2010 fall season as of Feb. 2010.
3 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/season.


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

Disease Bud break Full bloom Preharvest Interval 1 Postharvest
14 day 7 day 1 day
Botrytis fruit rot ----  ++2 ++ +++ ++++ ++++
Rating:      ++++ = most effective, +++ = highly effective, ++ = moderately effective, + = least effective, ---- = ineffective
1 Apply as needed. A predictive model BOTMON is available using ONFIT methods for disease detection.
2 Apply only if rain is forecasted.



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Kiwifruit
UC ANR Publication 3449

General Information

Adaskaveg, J. E., T. J. Michailides, and W. D. Gubler. 2017. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Deciduous Tree Fruit, Nut, Strawberry, and Vine Crops (PDF)

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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