Guidelines for applying Stadium to potato tubers

Willie Kirk, Michigan State University Extension, Department of Plant, Soil and Microbial Sciences; David Ross, Syngenta Crop Protection; Phillip Wharton and Nora Olsen, University of Idaho -

A new product, Stadium, is now registered as a pre-storage treatment for managing Fusarium dry rot and silver scurf in potato storage.

Potatoes are susceptible to a variety of storage pathogens, including Fusarium dry rot (Fusarium sambucinum), silver scurf (Helminthosporium solani), late blight (Phytophthora infestans), Pink rot (Phytophthora erythroseptica), Pythium leak (Pythium ultimum) and black dot (Colletotrichum coccodes). Current recommendations for potato storage diseases include sanitation and exclusion as the primary controls for these pathogens in storage facilities. Few fungicides are registered for direct application to tubers for control of these important pathogens and few compounds are available for potato tuber treatment in storage, including chlorine-based disinfectants such as, sodium hypochlorite, calcium hypochlorite and chlorine dioxide. 

Several commercial storage products Phostrol (sodium, potassium and ammonium phosphates), and Storox  (hydrogen peroxide/peroaxyacetic acid mixture) are registered for control of storage pathogens. Recently, Stadium a new product from Syngenta Crop Protection was registered for use as a pre-storage treatment for management of Fusarium dry rot and Silver Scurf in storage. Stadium is a three way mixture of azoxystrobin (Quadris), fludioxonil (Maxim) and difenoconazole (Inspire) and the application rate is 1.0 fl. oz. per 20 cwt (ton) of potato tubers carried in 0.5 gal H2O per ton of tubers. Results from trials at MSU and University of Idaho show that Stadium provided effective disease control. Please view How to achieve optimum coverage with Stadium on potato tubers entering storage for guidance.

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