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Laboratory studies on the growth and reproduction of Cladosporium allii‐cepae , the cause of leaf blotch of onion
Author(s) -
HALL K.,
KAVANAGH J. A.
Publication year - 1984
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1984.tb02634.x
Subject(s) - cladosporium , biology , germination , iprodione , spore , maneb , reproduction , agar , spore germination , botany , distilled water , fungicide , horticulture , potato dextrose agar , penicillium , mancozeb , bacteria , ecology , chemistry , genetics , chromatography
Cladosporium allii‐cepae is a slow‐growing pathogen of onion which, on malt extract agar, had a mean colony diameter of 2.7 cm after 28 days at 16°C. Growth and reproduction were greatest on malt onion leaf agar and were poor on synthetic media. The optimum and maximum temperatures for growth were 20 and 28°C, respectively. Sporulation was most abundant at 10–15°C. The fungus grew poorly in buffered Czapek Dox medium at pH 2.2–7.8 and most growth was recorded at pH 6.5. Sporulation was enhanced by exposure of colonies to near ultraviolet light. A large proportion of spores germinated in distilled water and at 100% r.h. In distilled water germination was greatest at 15–20° and in air at 100% r.h. at 20°C. Of 10 fungicides tested, fentin hydroxide, fentin acetate/maneb and iprodione were the most effective in inhibiting spore germination, growth and reproduction of the fungus.