Weather variables has served a descriptive and predictive role by identifying and quantifying factors that lead to disease outbreak or cause spatial or temporal increase or decrease in disease severity. Accordingly studies on role of weather factors on the development of field bean anthracnose were conducted and results indicated that disease severity was significantly influenced by weather factors at different dates of sowing. Early infection, of about 5-7 days, occurred during 2017-18 irrespective of same dates of sowings as compared to during 2016-17. Progress of disease increased slightly from first week of November to last week of January or first week of February in both years and reached peak at 6th SWM, thereafter declined gradually due to raise in the temperature. During the major progress, mean maximum and minimum temperature were around 29.49ºC and 20.13ºC, respectively, whereas morning relative humidity was 86.05% with moderate rainfall. Correlation analysis showed positi

anthracnose, correlation, disease severity, field bean, regression, weather factors.

Plant disease is a dynamic process in time and space caused by the continuous irritation of a susceptible host due to a biotic or abiotic agent in a conducive environment which results in loss of crop or yield or both above economic threshold level. In the present it was concluded that, severity of field bean anthracnose was significantly influenced by different weather variables at different dates of sowing and January first two weeks were found favourable for initiation of disease. The infection started at 46th SMW and attained its peak on completion of major portion of rainfall. Duration from 16th January to 9th February may be considered as window period for field bean anthracnose for entire season in different dates of sowing. Hence, it is necessary to implement various effective management strategies from 16th January to 9th February. Disease infection, development and spread are associated with weather factors. Temperature and humidity play an important role for the development

Rao, S. N., Bhattiprolu, S.L., Kumari3, V. P., Gopal, A.V. and Sekhar, V. (2021). Effect of Weather Variables on the Development of Field Bean Anthracnose at Different Dates of Sowing. Biological Forum – An International Journal, 13(2): 273-281.