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A Naturally Occurring Resistant Forma Specialis of Phytophthora drechsleri to Metalaxyl
Author(s) -
Chauhan V. B.,
Singh U. P.
Publication year - 1987
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1987.tb04421.x
Subject(s) - metalaxyl , biology , horticulture , botany , fungicide
Metalaxyl was assayed in vitro against six species or formae speciales of Phytophthora. The ED 50 values of metalaxyl for P. drechsleri, P. drechsleri, P. megasperma f. sp. medicaginis, P. megasperma f. sp. glycinae, P. boehmeriae, P. citricola and P. drechsleri f. sp. cajani ranged from 0.09–19.00 μg ml −1 . The values for P. citricola and P. drechsleri f. sp. cajani were 6.45 and approximately 19.0 μg ml −,1 . The ED 90 values of all the species or forma speciales ranged from 0.9 to 199.0 μg ml −1 . The ED 90 for P. citricola and P. drechsleri f. sp. cajani was 48 and 199 μg ml −1 , respectively. < P. drechsleri f. sp. cajani appears to be a naturally resistant forma specialis against metalaxyl.