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How to Manage Pests

UC Pest Management Guidelines

Floriculture and Ornamental Nurseries

General Properties Of Fungicides

(Reviewed 3/09, updated 3/09)

In this Guideline:

Common name (trade name) Chemical class Activity Mode of action1 Resistance potential Comments
azoxystrobin (Heritage) Qol2 single-site 11 high  
Bacillus subtilis (Rhapsody) biological contact NC low  
chlorothalonil (Daconil) chloronitrile multi-site M5 low  
dicloran aromatic hydrocarbon systemic (local) 14 medium  
dimethomorph (Stature) carboxylic acid amines 40 low-medium  
etridiazole (Terrazole CA) heteroaromatic 14 low-medium  
fenarimol (Rubigan) DMI3-pyrimidine single-site 3 medium  
fenhexamid (Decree) hydroxyanilide 17 low-medium  
fixed copper (Kocide, etc.) inorganic multi-site M1 low  
fludioxonil (Medallion) phenylpyrroles 12 low-medium  
flutolanil (Prostar) carboxamides 7 medium  
fosetyl-al (Aliette) phosphonate multi-site 33 low  
Gliocladium virens (SoilGard) biological NC low  
iprodione (Chipco 26019) dicarboximide multi-site 2 medium-high  
lime sulfur inorganic multi-site M2 low incompatible with most other pesticides
mancozeb (Dithane) dithio-carbamate (EBDC)3 multi-site M3 low  
mefenoxam (Subdue Maxx) acylalanine single-site 4 high  
myclobutanil (Hoist) DMI3-triazole single-site 3 medium  
neem oil (Triact) oil NC none  
PCNB (Terraclor) aromatic hydrocarbon single-site 14 low-medium  
piperalin (Pipron) amines 5 low-medium  
potassium bicarbonate (Kaligreen) inorganic NC none  
potassium phosphate (Fosphite) inorganic contact NC low  
propiconazole (Banner Maxx) DMI3-triazole single-site 3 medium  
Streptomyces griseoviridis (Mycostop) biological NC low  
stylet oil (JMS) oil NC none  
thiophanate-methyl (FungoFlo, etc.) benzimidazole single-site 1 high  
triadimefon (Strike, etc.) DMI3-triazole single-site 3 medium  
Trichoderma spp. (Garden Solutions, etc.) biological NC low  
trifloxystrobin (Compass) Qol2 single-site 11 high  
triflumizole (TerraGuard) DMI3-imidazole single-site 3 medium  
wettable sulfur inorganic multi-site M2 low  
= no information
NC = not classified
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 Qol = quinone outside inhibitor
3 DMI = demethylation (sterol) inhibitor
4 EBDC = ethylene bisdithiocarbamate



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Floriculture and Ornamental Nurseries
UC ANR Publication 3392
S. T. Koike, UC Cooperative Extension Monterey County
C. A. Wilen, UC IPM Program, UC Cooperative Extension San Diego County
Acknowledgment for contributions to Diseases:
R. D. Raabe, (emeritus) Environmental Science, Policy, and Management (ESPM), UC Berkeley
A. H. McCain, (emeritus) Environmental Science, Policy, and Management (ESPM), UC Berkeley
M. E. Grebus, Plant Pathology, UC Riverside

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