Impact of Weather Variables on the Development and Progress of Okra Powdery Mildew

Le résumé fourni par la source

Powdery mildew, caused by the fungus Erysiphe cichoracearum, is a common and significant disease affecting okra (also known as lady's finger or gumbo). This disease can lead to substantial yield losses, impacting the overall economics of okra cultivation. Therefore, the development and progress of powdery mildew concerning meteorological factors were studied in a natural/field condition. Out of twelve factors, maximum temperature (0.903), mean temperature (0.728), bright sun shine hours (0.910), GDD (0.746), AGDD (0.962) and crop age (0.959) were found significantly positive correlation while minimum temperature (-0.840), morning relative humidity (-0.845), afternoon relative humidity (-0.935) and mean relative humidity (-0.929) were showed significantly negative correlation with the powdery mildew intensity of okra, in Kharif season. The values of the correlation coefficient value of Rabi season showed significantly positive relationship of PDI with minimum temperature (0.730), GDD (0.795), AGDD (0.986) and crop age (0.970) in the okra. Whereas, in Summer among all the variables, afternoon relative humidity (0.845), mean relative humidity (0.824), AGDD (0.949) and crop age (0.942) were registered significantly positive correlation while maximum temperature (-0.821), mean temperature (-0.755) BSSH (-0.907) and GDD (-0.756) showed significantly negative correlation. The result of regression analysis showed afternoon relative humidity, mean relative humidity and crop age were the crucial factors for the development of powdery mildew during Kharif season. Variation accounted by this regression equation is 97.5 per cent (R2 = 0.975). In Rabi, variation accounted by regression equation is 96.8 per cent (R2 = 0.968). So, morning relative humidity and crop age were identified as a crucial factors for the development of powdery mildew in Rabi season. In Summer season variation accounted by regression equation is 99.7 per cent (R2 = 0.997) and the mean temperature, bright sun shine hours and crop age were found as most associative factors, which can predict the PDI of powdery mildew in natural conditions

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