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UC Pest Management Guidelines

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Pistachio

General Properties of Fungicides Used in Pistachios

(Reviewed 2/07, updated 3/10)

In this Guideline:
Common name
(trade name)		 Chemical class (FRAC # )1 Activity Mode of action Resistance potential
azoxystrobin (Abound) QoI2 (11) contact, systemic single-site high
boscalid (Endura) carboxamide (7) systemic (local) multi-site low
cyprodinil (Vangard) anilinopyrimidine (9) mostly contact single-site high
fenhexamid (Elevate) hydroxyanilide (17) contact single-site high
fludioxonil (Switch) phenylpyrrole (12) contact few to multi low
iprodione (Rovral) dicarboximide (2) systemic (local) multi-site low
pyraclostrobin (Cabrio) QoI2 (11) systemic (local) single-site high
pyrimethanil (Scala) anilinopyrimidine (9) mostly contact single-site high
tebuconazole (Elite) DMI3-triazole (3) systemic (local) single-site high
thiophanate-methyl (Topsin) benzimidazole (1) systemic (local) single-site very high
trifloxystrobin (Gem) QoI2 (11) systemic4 single-site high
1  Group 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.
2 QoI = quinone outside inhibitor (strobilurin).
3 DMI = demethylation (sterol) inhibitor.
4  Generally considered to have systemic action based on performance data but has not been proven experimentally.

Adapted from:
Adaskaveg, J. E., B. A. Holtz, T. J. Michailides, and W. D. Gubler. 2009. Fungicide Efficacy and Timing for Deciduous Tree Fruit and Nut Crops and Grapevines (960 KB, PDF)

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Pistachio
UC ANR Publication 3461

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