Agriculture: Floriculture and Ornamental Nurseries Pest Management Guidelines

General Properties of Fungicides

Common name (trade name) Chemical class Activity Mode of action1 Resistance potential Comments
ametoctradin/dimethomorph (Orvego) QoSI/carboxylic acid amides systemic (local) 45/40 low
azoxystrobin (Heritage) Qol2 single-site 11 high
boscalid/pyraclostrobin (Pageant) carboximide/QoI2 multi-site 7/11 medium resistance to FRAC 7 has been documented
Captan (Captan) phthalimides multi-site (contact) M 04 low
chlorothalonil (Daconil) chloronitrile multi-site M 05 low
cyazofamid (Segway) cyanoimidazole contact 21 resistance risk unknown, but assumed to be medium to high
cyprodinil/fludioxionil (Palladium) anilinopyrimide/phenylpyrrole contact 9/12 low to medium
dicloran (Botran) aromatic hydrocarbon systemic (local) 14 medium
dimethomorph (Stature) carboxylic acid amines 40 low-medium
etridiazole (Terrazole CA) heteroaromatic 14 low-medium
fenamidone (Fenstop) QoI2-imidazolinones contact 11 high cross-resistance to fungicides of QoI group documented
fenhexamid (Decree) hydroxyanilide 17 low-medium
fixed copper (Kocide) inorganic multi-site M 01 low
fludioxonil (Medallion) phenylpyrroles 12 low-medium
fluopicolide (Adorn) pyridinylmethyl-benzamides systemic (locally) 43 low
fluoxastrobin (Disarm) QoI2–dihydro-dioxazines systemic 11 high cross-resistance to fungicides of QoI group documented
flutolanil (Prostar) succinate-dehydrogenase inhibitor 7 medium
Gliocladium virens (SoilGard) biological NC low
iprodione (Chipco 26019 N/G) dicarboximide multi-site 2 medium-high
lime sulfur inorganic multi-site M 02 low incompatible with most other pesticides
mancozeb (Dithane) dithio-carbamate (EBDC)4 multi-site M 03 low
mandipropamid (Micora) mandelic acid amides 40 low to medium
mefenoxam (Subdue Maxx) acylalanine single-site 4 high
myclobutanil (Rally) 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
propiconazole (Banner Maxx) DMI3-triazole single-site 3 medium
Reynoutria sachalinensis - knotweed, plant extract (Regalia) biological NC low
Salts or esters of phosphorous acid (Aliette) phosphonate multi-site P 07 low
Streptomyces griseoviridis (Mycostop) biological BM 02 low
stylet oil (JMS) oil NC none
tebuconazole (Torque) DMI3–triazole single–site 3 medium Resistance is known in several fungal species, cross-resistance is present in DMI–group
thiabendazole (Mertect) benzimidazole single-site 1 high
thiophanate-methyl (Talaris) thiophanate single-site 1 high
triadimefon (Bayleton) DMI3-triazole single-site 3 medium
Trichoderma spp. (RootShield) biological BM 02 low
trifloxystrobin (Compass O) Qol2 single-site 11 high
triflumizole (TerraGuard) DMI3-imidazole single-site 3 medium
wettable sulfur inorganic multi-site M 02 low
= no information
NC = not classified
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 Qol = quinone outside inhibitor
3 DMI = demethylation (sterol) inhibitor
4 EBDC = ethylene bisdithiocarbamate
Text Updated: 11/20