Collar rot of Indian bean caused by Sclerotium rolfsii Sacc. is exerting a major threat on Indian bean growers in South Gujarat. The initiation of the disease was first noticed after 10 and 15 days of sowing in susceptible variety GNIB-21 which was grown on 11 st Oct. and 12 nd Oct. of 2017-18 and 2018-19, respectively. Since then, there was linear progress of the disease during both the seasons. The disease appeared 2.6% at initial stage 44 th SMW and reached highest 37.2% at maturity 3 rd SMW during 2017-18. In 2018-19, disease appeared 2.75% at initial stage 44 th SMW and reached highest 38.47% at maturity 3 rd SMW. However in pooled of two years, the first symptom of collar rot was recorded on 44 th SMW (2.6%) and reached to 3 rd SMW (37.2%). Correlation coefficient study between weather parameters and disease incidence indicated that all the parameters jointly played an important role in the development of collar rot disease. Moreover, morning and afternoon 5cm and 10cm depth soil temperature, soil moisture 5cm and 10cm were found to play important role in the disease development. Co-efficient of determination, R 2 -value i.e., 0.675, 0.954 and 0.881 percent were found high during 2018, 2019 and pooled of two year, respectively. These high R 2 -value indicating a strong association between percent disease incidence to weather parameters.
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