PDF-Powdery Mildew

Cleistothecia of Erysiphe adunca 100x Cleistothecia of Erysiphe adunca 90x in various stages of development on the upper leafsurface of Salix Powdery mildews are plant pathogenic fungi t. Dry weather soon withers the leaves causing them to fall early However cool weather delays defolia tion Young infected peach fruits become distorted and seldom remain on the tree very long Infected fruits show irregular swollen colored areas on thei TOOWDERY ‘David,’ ‘Windsor,’ P. maculata ‘Alpha,’ ‘Blue Boy,’ ‘Prime Minister,’ ‘Orange Perfection,’ William W. Turechek, Juliet E. Carroll and Department of Plant Pathology, Cornell University, NYSAES, Integrated Pest Management Program, Cornell University, www.nysipm.cornell.edu/factsheets/treefrui t BTRL 12/99 2 producing a mat of white mycelium. It obtains its nutrients by producing specialized peg-like projections called “haustoria” which puncture host cells and absorb its conten What is Powdery Mildew?der that accumulates on leaves and stems predominantly in spring, and again toby millions of microscopic spores. It imbeds itself into tender new growth and feeds on the sap of homoeoalleles. in. hexaploid. bread wheat confers heritable resistance. to powdery mildew. Yanpeng. Wang, Xi Cheng . Qiwei. Shan, Yi Zhang, Jinxing Liu, . Caixia. Gao & . Jin. -Long . Qiu. Evan Perkins. & Activity. Sudarshan Patel. Manager Marketing. PI Industries Ltd. .. Technical Training by: . Fungus, Fungicides. Classification. & Activity. Fungus and Fungicide Basics. Fungicide Mode. . of action. S : % By Wt. Potassium salts of fatty acids ................................ ................................ ................................ ................................ ........................ Plant Disease Management Reports 1:V124 Page 1 e active ingredients because 1) they occur naturally and do not persist in the environment, 2) they are not toxic to mammals or other organisms tested, and 3) they are not likely to be toxic to plan CropTarget DiseaseFrequency ofapplicationFrequency ofRate/20 LRosesPotato TomatoRepeat 3 timesevery 10 days750 mL750 mL750 mL15 mL15 mL15 mLDowny mildewand botrytisLate blightLate blightRepeat 3 times PPFS-GH-03 Cooperative Extension Service Plant Pathology Fact Sheet Agriculture & Natural Resources • Family & Consumer Sciences • 4-H/Youth Development • Community & Economic Developme Erysiphe. . betae. . is . an important leaf disease . of sugar beet in . Northern . Europe. The disease . reduces . sugar yield by several . hkg. if not . controlled. . . QoI. fungicides in mixtures with azoles have provided reasonable control of powdery mildew and .