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Effects of cucumber genotype on the induction of resistance to powdery mildew, Sphaerotheca fuliginea , by 2, 6‐dichloroisonicotinic acid
Author(s) -
HIJWEGEN T.,
VERHAAR M.A.
Publication year - 1995
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.1365-3059.1995.tb01700.x
Subject(s) - sphaerotheca , powdery mildew , biology , cultivar , mildew , horticulture , botany
Conspicuous differences in inducibility of resistance to powdery mildew between susceptible and partially resistant cucumber cultivars were found when 2, 6‐dichloroisonicotinic acid (INA) was used as a model substance. In the partially resistant cv. Flamingo, EC 50 was approximately 0·25 mg/1. In the susceptible cvs Corona and Lange Groene Gigant it was approximately 6mg/1. In greenhouse experiments with cv. Flamingo, powdery mildew could be well controlled with fortnightly applications in doses as low as 0·5 mg/1. The effect was highly cumulative.