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F E B R U A R Y 2 0 1 6 POTATO GROWER 21 Dr. Charkowski would like to see a clear- er notification of black leg on the North American Potato Health Certificate available for each certified seed potato lot upon request. Wisconsin did a small survey of Field Year 3 seed lots and found no Dickeya but one Pectobacterium. It was stated that seed cutting spreads the bacteria. It was suggested to use whole seed when possible. Also a thor- ough cleaning and sanitizing of equip- ment should be done between seed lots. When seed cutting it is preferable to allow for suberization of the seed pieces before planting. A poor emergence may be caused by Dickeya. Testing of such a field may confirm it. It was recommended not to spread the bacteria from such a field. Excessive water spreads the bacteria. Copper sprays can slow the spread. Legumes and small grains are poor hosts for the pathogen. Crop rotation of three years will reduce the occurrence of Dickeya. It survives well in water and weeds but not in the soil. It can spread after severe storms. Calcium helps pro- tect the plants and too much nitrogen increases susceptibility. It is dangerous to store rotten tubers. Storage management needs to be opti- mal. It is better not to harvest an infect- ed field. Management for all soft rot bac- teria is about the same. Dr. Rick Pederson Agriculture and Agri- Food Canada had as subject how to fit phosphites into a disease management program. Phosphite applications on seed are phytotoxic and not an option. In furrow applications are not effective and can have an adverse effect when the phospites come in touch with the cut surface of the seed pieces. Soil drench- ing was said to be more effective. Foliar applications were considered effective when starting early especially before late blight is found. Phospites control oomycetes and stimulate plant health. One needs a sufficient dosage to obtain disease control. A total during the sea- son was suggested to be 7 to 10 liter min. 2 gallons per acre per acre. In times of stress dosages should be reduced. Washing off of the chemical should be avoided. Dr. Pederson was still cautious about foliar applications on seed potatoes. He mentioned the possibility of adverse effects of yields of Minnesota Certified Seed Potatoes When you buy Minnesota certified seed potatoes youre getting a history of high performance high quality seed. Minnesota seed is grown on a wide range of soil types from the rich black soils of the Red River Valley to the irrigated sands of Central Minnesota to the deep peat soils of East Central and Southern Minnesota. If you want a specific variety we can grow it. www.mnseed potato.org For your free copy of the Minnesota Certified Seed Directory Call 218-773-4956 MINNESOTA CertifiedSeedPotatoDirectory 2015