1. Influence of weather variables on incidence and progress of bacterial blight of cotton in south western Punjab.
- Author
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SHARMA, AMAN, MISHRA, SUDHIR KUMAR, and KUMAR, HARISH
- Subjects
BACTERIAL blight of cotton ,PHYSIOLOGICAL effects of weather ,PLANT diseases ,AGRICULTURAL meteorology ,DISEASE incidence ,AGRICULTURAL climatology - Abstract
Bacterial blight, caused by Xanthomonas axonpodis pv malvacearum is one of the most important cotton diseases in south western Punjab which leads to heavy losses especially at early crop phonological stages. An experiment was conducted on a cotton genotype (RS 921) at PAU, Regional Research Station, Faridkot to find out relationship between incidence of bacterial blight with weather parameters during Kharif 2014 and 2015. Disease incidence (DI) was recorded weekly. Correlation results revealed that temperatures (maximum, minimum and mean) were negatively correlated with disease whereas, temperature range (maximum temperature - minimum temperature) was highly favorable (r= 0.86* and 0.78** during 2014 and 2015, respectively). Likewise, increase of DI was positively associated with morning relative humidity. Both years, rainfall did not favoured the disease incidence (r = -0.35 and r = -0.07). Similarly, increase in the duration of bright sun shine hours also adversely affected the disease development. The regression model accurately estimated the disease incidence during different standard weeks of Kharif 2014 and 2015 which was validated in Kharif 2016. Results of present study are supposed to provide basis for forecasting of disease development which will help to develop advance warning system for timely management of bacterial blight. [ABSTRACT FROM AUTHOR]
- Published
- 2017