![]() Keep informed about possible late blight observed in your area. Start treatment and manage applications intervals based on severity values. Keep track of late blight severity values in your area (See "Forecasting"). Apply a protectant right away if plants emerged and it rained. Monitor emerged plants in low, wet areas. Note: there is no seed treatment against late blight. Monitor storage carefully for any sign of tuber decay.ī. Kill vines totally prior to harvest because late blight does not sporulate on dead plant tissue. Pay special attention to the first span of center-pivots, low-lying areas and along the sides of the pivot platform.ĩ. Thoroughly scout each field throughout the season to detect late and/or early blight as soon as possible. Apply the first foliar fungicide treatment when recommended by disease forecasting models, confirmed sightings of disease or weather patterns favorable for carrying late blight from other states. Fertilize and irrigate optimally for the variety.ħ. Hill potatoes to ensure that young tubers are adequately covered by soil.Ħ. Minimize handling of seed tubers if seed is cut, immediately treat with a mancozeb-containing fungicide.ĥ. Check the "North American Certified Seed Potato Health Certificate" provided for each lot.Ĥ. Plant certified seed and be aware of the late blight situation in the field from which it was harvested. Russet Burbank and Snowden are moderately susceptible Atlantic, Monona, Norchip, Red Norland, Russet Norkotah, and Yukon Gold are very susceptible.ģ. Be aware of the relative susceptibility to late blight of the potato varieties that you are planting. Eliminate potato cull piles and all other sources of living tubers and eliminate volunteer potatoes from last season.Ģ. ![]() ![]() KEY 10 Recommendations to minimize late blight in potato fields:ġ. The most effective disease management programs will simultaneously use as many different approaches to control possible. ![]() Disease management guidelines aim at manipulating interactions of these factors, making disease development less likely. For a disease to exist, it needs three things: a host, the pathogen and the right environment - the disease triangle (Figure 1). When conditions are right such as the cold, wet weather and the thunder storms of 1993, late blight can survive very well and be moved as much as 50 miles in a day. The critical thing that you need to remember is that late blight needs living tissue to survive. ![]()
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