Studies on the relationship between weather parameters and bacterial blight of cotton

摘要

Bacterial blight of cotton caused by Xanthomonas axonopodis pv malvacearum (Smith). Dye is a major disease prevalent throughout the cotton growing areas of the Punjab. Keeping in view the importance of the malady study was conducted in kharif 2000 and 2001 at PAU, Regional Research Station, Faridkot During kharif 2000 a field experiment was conducted at PAU, Regional Research Station, Faridkot with the objective to study the relationship between weather parameters (Temperature, Relative humidity and Rainfall with the severity of the bacterial blight during cropping season. For this purpose a susceptible variety F 846 was planted with spacing of 67.5X 30 cm with plot size of 180m~2 during 2nd and 3rd week of May 2000 and 2001. All the recommended agronomic practices were followed for raising the crop. The correlation of bacterial blight severity with different weather parameters have been determined. The simple correlation of bacterial blight severity with different weather parameters were non significant in both the years. The multiple correlation of bacterial blight severity with maximum, minimum, mean temperature; maximum, minimum, mean relative humidity and rainfall was non significant in kharif 2000. But there was significant multiple correlation between bacterial blight severity and maximum, minimum, mean temperature; maximum, minimum, mean relative humidity and rainful in kharif 2001.