Microbiology Research Journal International

Epidemiological Factors Influencing the Development of Bacterial Blight in Clusterbean in Semi Arid Eastern Plain Zone –IIIA of Rajasthan, India

Anita Jat *

Department of Plant Pathology, Sri Karan Narendra Agriculture University, Jobner, Jaipur (Raj.) India.

P.S. Shekhawat

Department of Plant Pathology, Sri Karan Narendra Agriculture University, Jobner, Jaipur (Raj.) India.

Mukesh Nitharwal

Department of Entomology, Sri Karan Narendra Agriculture University, Jobner, Jaipur (Raj.) India.

S.M. Choudhary

Department of Horticulture, MPKV, Rahuri (Maharashtra), India.

Meera Choudhary

Department of Plant Pathology, Sri Karan Narendra Agriculture University, Jobner, Jaipur (Raj.) India.

*Author to whom correspondence should be addressed.

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Abstract

Background: The bacterial blight caused by Xanthomonas axonopodis pv. cyamopsidis is the most destructive disease of clusterbean causing tremendous losses in yield and quality under severe conditions.

Methods: The effect of environmental factors on the development of bacterial blight disease of clusterbean on susceptible cultivar RGC-936 on experimental field at RARI, Kharif 2018 and 2019. The seeds of susceptible cultivar RGC-936 were sown by staggered sowing at 10 days interval initiated from 10^th July, 20^th July, 30^th July, 9^th August and end with 19^th August in field conditions. The plot size was 3 x 2 m² and spacing 30 x10 cm between row to row and plant to plant, respectively. After sowing, 30 days old plants were inoculated by spray inoculation method with a bacterial suspension (2.5x10⁸cfu/ml).

Results: The maximum bacterial blight disease severity was recorded during the period between 36^th to 37^th standard meteorological weeks (3^rd Sept. to 16^th Sept.). Hence, the first fortnight of September to the second fortnight of September can be considered as window period for bacterial blight disease.

Keywords: Bacterial blight, environmental factors, clusterbean, epidemiological factors

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