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Fungicide resistance in soil‐borne Phytophthora species 1
Author(s) -
LUCAS J. A.,
BOWER L. A.,
COFFEY M. D.
Publication year - 1990
Publication title -
eppo bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.327
H-Index - 36
eISSN - 1365-2338
pISSN - 0250-8052
DOI - 10.1111/j.1365-2338.1990.tb01199.x
Subject(s) - phytophthora , fungicide , metalaxyl , biology , phytophthora capsici , spore , resistance (ecology) , pathogen , phytophthora sojae , chemical control , botany , horticulture , agronomy , microbiology and biotechnology
Systemic fungicides such as the phenylamides and phosphonates have provided new opportunities for chemical control of soil‐borne Phytophthora species. Potential problems in their use include biodegradation in soils, and the emergence of pathogen isolates resistant to these compounds. Resistance to phenylamides is well known in leaf‐infecting Oomycetes, but less is known about the development and relative fitness of resistant isolates among populations of soil‐borne Phytophthora species. Experiments with P. capsici and P. palmivora have shown that stable resistant and virulent isolates can be selected under laboratory conditions. Some mutants resistant to both metalaxyl and fosetyl‐A1 have been recovered, with growth rates and sporulation equivalent to parental wild types. Selected mutants proved able to compete in vivo with fungicide‐sensitive wild types in the absence of the compounds. More information is required to fully evaluate the implications of these results for chemical control of soil‐borne Phytophthora species in the field. Résistance des Phytophthora du sol aux fongicides