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Mycosphaerella stem rot of cucumbers in the Lea Valley
Author(s) -
FLETCHER J. T.,
PREECE T. F.
Publication year - 1966
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1966.tb04402.x
Subject(s) - biology , mycosphaerella , fungicide , horticulture , sowing , stem rot , pruning , spore , phytosanitary certification , botany
SUMMARY Stem rot of cucumbers, caused by Mycosphaerella melonis (Passer.) Chiu & Walk, was present in Butcher's Disease Resister in every glasshouse in the Lea Valley examined in 1963 and was sometimes noticed as early as April. No correlation was detected between the severity of the disease and the type of bed used (straw bale or traditional), type of training (arch or cordon), thermostat setting, ventilation practice, date of planting, or routine fungicidal spraying practice. The disease could be transmitted on a pruning knife to any node of the plant. Infection by air‐borne spores was induced experimentally. Leaves could not be infected artificially. The frequency of air‐borne ascospores of the fungus showed a conspicuous evening peak. Numbers of spores were highest in wet dull weather. Dithiocarbamates appear to be the most effective fungicides now available for control.