Premium
OBSERVATIONS ON APPLE CANKER
Author(s) -
MUNSON R. G.
Publication year - 1939
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.1744-7348.1939.tb06982.x
Subject(s) - ascospore , conidium , biology , spore , canker , biological dispersal , botany , ascus (bryozoa) , horticulture , germination , population , demography , sociology
S ummary1 The fungus causing apple canker is described and its identity with Nectria galligena Bres. is confirmed. 2 The methods of dispersal of the spores of N galligena have been examined. The ascospores are discharged forcibly from the perithecium, the eight spores of each ascus typically being ejected simultaneously. 3 Field investigations have shown that spores are discharged during wet periods at all times of the year. Ascospore discharge reaches its maximum in January‐February and falls to a minimum in the summer months. 4 The dispersal of conidia occurs during wet periods in the spring and autumn. 5 Germination both of ascospores and conidia occurs over a range of temperature from 2 to 30°C, the optimum being at 20°C.