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The life‐history and epidemiology of American gooseberry mildew on black currants
Author(s) -
JORDAN V. W. L.
Publication year - 1968
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.1744-7348.1968.tb04541.x
Subject(s) - biology , sphaerotheca , spore , mildew , powdery mildew , conidium , fungus , botany , relative humidity , horticulture , sugar , food science , physics , thermodynamics
SUMMARY It is shown that conidia of Sphaerotheca mors‐uvae (Schw.) Berk, from gooseberry readily infect black currant; therefore it is unlikely that a new race of S. mors‐uvae specifically pathogenic to black currants has recently appeared. However, the life‐cycle on black currants differs from that on gooseberry. Incubation, infection and sporulation of the fungus have been examined under the optimum conditions of 18 °C and 100% relative humidity. The establishment of infections and sporulation was encouraged by a relatively low soil moisture content, temperatures above 15 °C, 60% relative humidity and good illumination‐factors which promote vigorous plant growth. High phosphorus and high potassium nutrition also increased the susceptibility of black currants to infection.