Screening of Okra Genotypes against Powdery Mildew under Natural Epiphytotic Conditions

Abstract

Okra (Abelmoschus esculentus (L.) Moench) is a globally crucialannual vegetable belonging to family malvaceae, it is the most broadly distributed vegetable all over the world. Among the fungal diseases affecting okra crops, powdery mildew caused by Erysiphecichoracearum DC. is the most crucial disease-causing considerable yield losses. Host plant resistance is one of the most practical, economical and feasible methods of management of plant diseases. An attempt was made to identify sources of resistance which could be used in developing resistant variety to mitigate loss in farmer’s field.Fifty okra genotypes were screened for their response to powdery mildew under natural epiphytotic conditions during Rabi, 2020-21Results revealed that, out of fifty genotypes screened, none of them showed immune and resistant reactions to powdery mildew. However, one genotype i.e., EC329404 showed a moderately resistance reaction. Twenty genotypes showed a moderately susceptible reaction. While twenty-two genotypes showed susceptible reaction, and one genotype viz., IC42531 showed a highly susceptible reaction. The average ‘r’ value ranged from 0.070 to 0.123. The highest average ‘r-value (0.123) was observed in genotypes IC42524 and EC329405, with the least average ‘r’ value in genotype EC329415 (0.070). For yield, It was found that most of the genotypes screened were potential yielders and recorded good yield despite the pathogen attack. Thus these high-yielding genotypes can be utilised in back cross-breeding along with disease resistant parent (EC 329404) to obtain resistant variety with high-yielding potential.