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How to Manage Pests

UC Pest Management Guidelines

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Citrus

General Properties of Fungicides Used in Citrus

(Reviewed 9/08, updated 9/08)

In this Guideline:
Common name
(trade name)		 Chemical class Activity Mode of Action (Group number)1 Resistance potential Comments
azoxystrobin Qol (strobilurin) local systemic single-site (11) high  
bordeaux inorganic contact multi-site (M1) low copper and lime based mixture that often includes a zinc adjuvant.
chloropicrin soil fumigant mostly contact multi-site (FRAC numbers not applicable) low soil fumigant
copper inorganic contact multi-site (M1) low fixed coppers (non-copper sulfate materials such as copper hydroxide and copper oxide)
fosetyl-al (Aliette) phosphorothiolate systemic multi-site (33) low  
hydrated lime inorganic contact multi-site (M1) low  
mefenoxam (Ridomil Gold) acylalanine systemic single-site (4) high  
pyraclostrobin/boscalid Qol (strobilurin)/ carboxamide local systemic single-site (7/11) 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. For fungicides with mode of action Group numbers 1, 4, 9, 11, or 17, make no more than one application 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.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Citrus
UC ANR Publication 3441
General Pesticide Information
E. E. Grafton-Cardwell, Kearney Agricultural Center, Parlier
J. G. Morse, Entomology, UC Riverside
N. V. O‘Connell, UC Cooperative Extension, Tulare County
P. A. Phillips, UC IPM Program, UC Cooperative Extension, Ventura County
C. E. Kallsen, UC Cooperative Extension, Kern County
D. R. Haviland, UC Cooperative Extension, Kern County

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