![]() We have also looked at some older products in new combinations like Stature (mancozeb and dimethomorph, SePRO). Over the past two years we have looked at a variety of other products, including Agri-50 (a combination of several ingredients, Cal Agri Products), Endorse (polyoxin-D, Cleary Chemical), CX-7001 (an experimental product) and BAS500 (a new strobilurin, BASF Corporation). Since resistance to fungicides is one of the key concerns with Botrytis, rotation should be the cornerstone of every Botrytis control program. These four active ingredients fall into distinct and separate chemical classes, making rotation for resistance management reasonably easy to accomplish. We have found chlorothalonil (Daconil, Syngenta Professional Products, and Spectro, Cleary Chemical), fenhexamid (Decree, SePRO), fludioxinil (Medallion, Syngenta Professional Products) and iprodione (Chipco 26019 and 26GT, Bayer Environmental Science) to be the most effective fungicides for prevention and eradication of Botrytis blight. Since returning to California 10 years ago, I have become much more familiar with these pathogens on our ornamentals. When I worked in Florida I rarely saw either of these diseases. usually causes blight (on bedding plants) and stem or crown rot (on perennials and cut flowers). On some crops, Botrytis cinerea infections are confined to flower spots while on others, cutting rot, stem rot and leaf spot also occur. We have seen Sclerotinia crown rot or blight primarily on alyssum, petunia, lilies, lobelia, wallflower, pansy, stock, larkspur and many other bedding, perennial and cut flower crops. ![]() Botrytis blight is very common on dahlia, fuchsia, geranium, cyclamen, exacum, poinsettia, pansy and lisianthus. We often see both fungi present in infected plants when the season changes from winter to spring. During the past two years, we also started working on Sclerotinia blight on petunia.īotrytis and Sclerotinia are related fungi, with Botrytis cinerea being the asexual state of Sclerotinia. Five years is probably long enough to wait to do an update since we have maintained an active research program in fungicide control of Botrytis on ornamentals trials each winter. The first article I wrote for GPN was on Botrytis prevention and control, and it appeared in October of 1998.
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