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WWW.POTATOGROWER.COM 37 research has shown that the temperature in the middle of the pile remained stable regardless of cull pile size (from 1 to 15 tons). Since cull piles in excess of 1 tons may enhance the survival of tubers and P. infestans mycelia even in the coldest winters, it is important to follow cull and waste potato management guidelines (see University of Idaho bulletin CIS 814, "Cull and Waste Potato Management"). Infected seed may be the most important source of primary inoculum for diseases like Fusarium dry rot and late blight. Seed treatments are easily applied and are generally inexpensive compared to foliar sprays. Additionally, research has shown that plant growth will be more vigorous and the crop will produce greater yields if seed pieces are free of pathogens. When using a seed treatment to control late blight, it is essential to ensure that one or more of the fungicides components has efficacy against P. infestans; numerous available seed treatments do not protect against late blight but are very effective against other seed-borne diseases such as Fusarium dry rot and Rhizoctonia. Some of these include fludioxonil (Maxim 4FS), penflufen (Emesto Silver) and flutolanil (Moncoat). In general, any seed treatment product containing mancozeb will provide effective control against seed-borne late blight. Seed treatments currently registered for use on potato in Idaho that contain mancozeb include Maxim MZ, Moncoat MZ and Nubark Mancozeb. Although Emesto Silver doesn't contain mancozeb, the label does recommend "a As effective tank mix partners that can be applied throughout the growing season, OxiDate 2.0 and OxiPhos are stronger when paired together, providing a curative contact kill of bacterial and fungal pathogens and systemic control of late blight, pink rot and pythium leak. 1.888.273.3088 | biosafesystems.com 171008BioSaf13s.indd 1 1/26/18 8:28 AM Dedicated to providing consistent high quality, high yielding seed year after year. You are always invited to stop by and see our facility. Let us show you what our program can do for you. Dan, Dave, Pat, and Tim Lake (406)253-3638 (offi ce) • (406)676-2175 (fax) e-mail - Spudman@ronan.net 35822 Spring Creek Road, Ronan, MT 59864 SEED INC. PVX GIII • RUSSET BURBANK • RANGER RUSSET • UMATILLA RUSSET • On-farm tissue culture laboratory and greenhouse facility for nuclear seed production • 4 year rotation on clean fi elds • Modern storage and handling facilities • Strict sanitation program throughout • Rigorous Spray Program 169055LakSee16h.indd 1 9/26/17 1:46 PM mancozeb-containing product specifically designed for application to potatoes in place of the inert absorbent." Seed treatments provide a chemical barrier around healthy seed pieces and also reduce the number of spores produced on the cut seed surface of infected seed pieces, thereby reducing the number of spores that can be spread during the seed-cutting and handling operation. In addition to maintaining seed health after cutting and re-storage before planting, these products will also improve emergence and reduce incidence of bacterial soft rot and blackleg, as they also reduce secondary infection by bacterial pathogens. Effective management of seed-borne diseases requires the implementation of an integrated disease management approach, including all of the above practices. Such an integrated approach can significantly reduce the chances of a late blight outbreak and protect against diseases such as Fusarium dry rot and Rhizoctonia.