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Blackrot on the hybrid vitis cultivar Isabella
Gessler C., Blaise P. and Jermini M.
IOBC/WPRS Bulletin 29 (11): 95-102, 2006
Black rot caused by Guignardia bidwellii is a present since almost 20 years in South Switzerland without causing damages in the vine producing Merlot vineyards. However, since a few years in the old traditiona vineyards of the hybrid cultivar Isabella damages can be high. Wrong diagnostic and missing know-how of the non professional winegrowers is the main cause. We describe here how the disease can be controlled efficiently under these conditions with as few as two corectly timed fungicide treatments.
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