Management of Bacterial Blight of Clusterbean Caused by Xanthomonas axonopodis pv. cyamopsidis under Field Conditions

Bacterial blight pathogen (Xanthomonas axonopodis pv. cyamopsidis) of clusterbean causes considerable damage every year during Kharif season and sometimes become very severe, which results in heavy loss in grain yield.

On the basis of in vitro studies, most effective botanical, antibiotic and fungicide at highest concentration were used as individual and its combinations in field experiment during two consecutive years Kharif 2018 and 2019. Seeds of clusterbean cultivar RGC-936 were artificially inoculated with X. axonopodis pv. cyamopsidis by soaking in bacterial cell suspension (2.5×10⁸ cfu/ml) for 30 min and dried under shade. The artificially inoculated seeds were used for sowing in field trial

Field evaluation, the combined treatment, seed treatment with streptocycline @ 250 ppm followed two foliar sprays of streptocycline @ 250 ppm and 1^st foliar spray of copper oxychloride @ 0.3 per cent and 2^nd foliar spray of streptocycline @ 250 ppm at 15 days interval was found the most effective in reducing the per cent disease severity and increasing the grain and fodder yield in clusterbean.