. Cranberries; : the national cranberry magazine. Cranberries. Answer Queries on Disease At Fieid Day in Washington The questions below were stuffed into the question box at the 1986 Field Day held at the Coastal Washington Research & Extension Unit in Long Beach. Answers to the queries were given by Peter Bristow. Q: Rose bloom seems to be increasing in severity. What is the control? A: The severity of this disease varies from bog to bog and sea- son to season. Areas with heavy rose bloom one year may be vir- tually disease-free the following year. To date, control has been directed at dr
. Cranberries; : the national cranberry magazine. Cranberries. Answer Queries on Disease At Fieid Day in Washington The questions below were stuffed into the question box at the 1986 Field Day held at the Coastal Washington Research & Extension Unit in Long Beach. Answers to the queries were given by Peter Bristow. Q: Rose bloom seems to be increasing in severity. What is the control? A: The severity of this disease varies from bog to bog and sea- son to season. Areas with heavy rose bloom one year may be vir- tually disease-free the following year. To date, control has been directed at drying up the rose blooms. The objective is to cause the fleshy structures to shrivel up before spores are produced on the surface. Growers have used Bordeaux mixture, Kocide and Ferbam, but with varying degrees of success. There has been no research that shows that fungi- cide sprays prevent infections which develop rose blooms the following spring. As many of you know, rose bloom is caused by the fungus called Exobasi- dium (specifically E. oxycocci). Other species cause gall-type symptoms on other plants and there is some evidence that the fungus is systemic in these plants. That is, the fungus grows internally from old growth into new growth. It is not known whether this occurs in the rose bloom disease. If it does occur, control by protectant type fungi- cides may be of little value. At present, we have no fungicides with systemic activity registered for disease control on cranberry. Q: You mentioned the fungi- cide, Benlate, at a winter meet- ing. Please tell me something about it. A: Benlate is the Du Pont trade name for the fungicide benomyl, which they developed in the late 1960's. For many crops, it I Niemi Electric Co. ROBERT NIEMI ELECTRICAL CONTRACTORS HEAT, UGHT and POWER WIRING • RESIDENTIAL • COMMERCIAL • INDUSTRIAL TEL. 295-1880 Robert Niemi Pinehurst Wareham, Mass. represented a dramatic step for- ward in disease control, because of its systemic activ
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