PRATEEK KUMAR*, DALVINDER PAL SINGH, RAVISH PANCHTA, RAKESH PUNIA AND PRAGATI YADAV
Department of Plant Pathology
Forage Section, Department of Genetics and Plant Breeding,
Department of Agronomy CCS Haryana Agricultural University, Hisar-125 004 (Haryana), India
*(e-mail : Prateekberwalhau@gmail.com)
(Received : 8 February 2024; Accepted : 28 March 2024)
SUMMARY
India is the major producer of cluster bean (Cyamopsis tetragonoloba L. Taub.) contributing about 82 per cent of the total production of the world and bacterial leaf blight is one of its most destructive disease caused by Xanthomonas axonopodis pv. cyamopsidis. It causes yield loss of 50–70 per cent of cluster bean under severe conditions, if appropriate measures to combat the disease are not taken timely. The disease effects crop productivity in all growing regions of the world. In Haryana state, the bacterial blight has been recognized as most important limiting factor in reducing the yield. It is both seed borne and air borne in nature and affects all above ground parts of plant. Chemicals have played significant role in management of the disease but their use in excessive amount led to detrimental effect on the ecosystem such as residual toxicity, harmful effect on living beings and the whole environment, especially on the beneficial predators, parasites and microorganisms. Keeping this in view, the present investigation has been devised on disease management using various biorational components during 2020-2021 at Hisar. It was observed that Azadirachta indica was found most effective with 18.04 per cent growth inhibition followed by Zingiber officinale under in vitro conditions. Under screen house conditions, minimum per cent disease incidence (PDI) of 26.67 per cent was observed in treatment of Azadirachta indica @ 25 per cent w/v followed by treatments of Zingiber officinale @ 25 per cent w/v.
Key words: Bio-agents, botanicals, growth inhibition, Xanthomonas axonopodis pv. cyamopsidis, bacterial blight, Azadirachta indica