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--Rick Cartwright and Gene Milus, Arkansas Cooperative Extension Service
Disease Fungicide Active Ingredient Rate/cwt Seed Comments
Loose Smut Raxil MD tebuconazole + 5-6.5 fl oz On-farm or commercial use. Dilute 1:1
Stagonospora glume blotch (flowable) metalaxyl with water before application to seed.
(glume blotch) Already contains dye. Do not graze for
38 days after seeding. Also controls
loose smut of oats - see label
Raxil XT tebuconazole + 0.16-0.20 oz Commercial seed treaters only. Dye
(water-soluble metalaxyl must be added. Do not graze for 38
powder pouches) days after seeding. Also controls
loose smut of oats - see label
Raxil-Thiram tebuconazole + 3.5 - 4.6 fl oz Commercial seed treaters only. Dye
(flowable) thiram must be added. Do not graze for 31
days after seeding. Also controls
loose smut of oats - see label
Dividend difenoconazole + 2 fl oz On-farm or commercial use. Wheat Cannot
Extreme mefenoxam be grazed until 55 days after planting. See
label for other restrictions.
Note: Wheat seed producers in Arkansas should always plant seed treated for prevention of loose smut and Stagonospora glume blotch to maximize
seed quality and prevent a buildup of these diseases in the seed supply. Growers that plant saved seed should have it treated with one of the
listed fungicides if the seed came from a field with these diseases or if either of the diseases was at epidemic levels in nearby fields during the spring.
Metalaxyl and mefenoxam are expensive fungicides active against Pythium root rot and come prepackaged with tebuconazole and difenoconazole
the active compounds against Loose Smut and glume blotch. We do not recommend metalaxyl or mefenoxam to control Pythium root rot for
wheat or for other stand establishment diseases since numerous field trials in Arkansas have not shown any benefit from the use of metalaxyl or mefenoxam on wheat seed.
However, prepackaging prevents us from listing only needed components