Mycosphaerella ribisleaf spot on black currants in New Zealand: Perithecial maturation, ascospore release, and symptom development
作者:
R.I. Mulholland,
R.M. Beresford,
期刊:
New Zealand Journal of Crop and Horticultural Science
(Taylor Available online 1989)
卷期:
Volume 17,
issue 2
页码: 165-168
ISSN:0114-0671
年代: 1989
DOI:10.1080/01140671.1989.10428026
出版商: Taylor & Francis Group
关键词: blackcurrant;Ribes nigrumL.;leaf spot;Mycosphaerella ribis;ascospore release;perithecia;fungicide timing;fungal disease
数据来源: Taylor
摘要:
Maturation of perithecia ofMycosphaerella ribis(Fuckel) Kleb, in black currant leaf litter was studied for three winters at two sites (Edendale, Southland, 1981 & 1982; Palmerston, Otago, 1983). Ascospores began to appear in June and all perithecia contained ascospores by early September. In a spore trapping study at the same sites, and at Irwell, mid Canterbury in 1984, ascospore release always began in late August or early September, reached a peak between mid September and mid October, and declined to an undetectable level by mid November. The onset of ascospore release tended to coincide with bud burst on black currant bushes. To prevent primary infection in spring, fungicide protection should be maintained from the time leaves emerge until the grape stage of flower development
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