Subdue Maxx receives 24(c) Special Local Needs label to control downy mildew on basil in Michigan

Michigan greenhouse and vegetable growers who grow Basil transplants for re-sale to consumers now have a fungicide to use for downy mildew control. The application label, guidelines and specific use instructions are valid until May 14, 2017.

Downy mildew (Peronospora belbahrii) of basil is becoming widespread across the nation with reports of over 10 states positively identifying it on field and greenhouse-grown basil crops. Symptoms include a yellowing of the upper leaf surface with purplish-gray fungal spores on the undersides of the leaf surface (Photos 1 and 2).

yellowish surface
Note the yellowish upper leaf surface of basil infected
with downy mildew. Photo credit: Margaret Tuttle McGrath, Cornell University

underside
Sporulation from downy mildew fungus on the underside
of a basil leaf. Photo credit: Margaret Tuttle McGrath, Cornell University

Since this disease can be seed-borne, there is speculation that it may be the source of most infections. Obtaining clean seed is critical, but also a fungicide program is essential to control this disease when growing transplants for general consumers to minimize the spread of basil downy mildew.

Michigan recently obtained a 24(c) Special Local Need label for the fungicide SUBDUE MAXX to aid in controlling downy mildew in basil. This label is valid until May 14, 2017. The24(c) label must be in possession of the user at the time of application. (Download a copy of the label.)

Specific use directions include a rate of 3.75 oz/5,000 sq ft or 32 oz/acre as a soil surface spray to plug production trays after seeding and before seedling emergence. It will be necessary to irrigate lightly after the application. No more than ONE application during the plug production phase. It should not be applied within 21 days of harvesting the basil for human consumption. Do not exceed the equivalent of 2.0 lbs a.i./acre per crop of soil applied mefenoxam containing products.

Many thanks to Mary Hausbeck, MSU Department of Plant Pathology, and her staff for providing the data and making the request for this Special Local Needs label for Michigan growers.

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