Resistance Management: A "Who's Who"
of Tomato Fungicides

With all the new fungicides available, it is getting hard to keep track of what is what. Here's a summary of the fungicide groups and disease spectrums for some of the new and commonly used tomato fungicides. Remember, to avoid the development of disease resistance, rotate between fungicide groups.

Active ingredient (Product) Group Code and Chemical Group Labelled pests
azoxystrobin(Quadris) 11
QoI1		 Anthracnose, early blight
boscalid(Lance WDG) 7
carboxamides		 Early blight, botrytis gray mold
captan(various formulations) M2
phthalamides		 Early blight, late blight, septoria leaf spot, anthracnose, gray leaf spot
chlorothalonil(Bravo 500 F) M2
chloronitriles		 Early blight, late blight, septoria leaf spot, anthracnose, botrytis gray mold
copper hydroxide(various formulations) M2
inorganics		 Early blight, late blight, septoria leaf spot, bacterial spot, bacterial canker
famoxadone/cymoxanil(Tanos 50DF) 11, 27
QoI1, cyanoacetamide-oxine		 Early blight, late blight
mancozeb(various formulations) M2
dithiocarbamates		 Early blight, late blight, anthracnose, gray leaf spot
metiram(Polyram) M2
dithiocarbamates		 Early blight, late blight, gray leaf spot
pyraclostrobin(Cabrio) 11
QoI1		 Early blight, late blight, septoria leaf spot, anthracnose

1 QoI = quinone outside inhibitors

2 The M group are multi-site contact activity fungicides. There is no cross-resistance between subgroups of the M group. This group has a low risk of resistance development.

See OMAFRA Publication 363, Vegetable Production Recommendations for more information on tomato pest control. Always read and follow label directions.Ordering information for OMAFRA Publication 363, Vegetable Production Recommendations can be found on this web site.

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For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
Author: Janice LeBoeuf - Vegetable Crop Specialist/OMAFRA Ridgetown
Creation Date: 01 October 2004
Last Reviewed: 01 October 2004