Efficacy of newly developed biopesticides for the management of wilt disease complex of chickpea (Cicer arietinum L.)

Abstract

Effectiveness of three biopesticides viz., Biowilt-X (based on Trichoderma harzianum), Bionem-X (based on Pochonia chlamydosporia) and Biocure-X (based on Bacillus subtilis) were tested against wilt (Fusarium oxysporum f. sp. ciceri), root-knot (Meloidogyne incognita) and the wilt disease complex (F. oxysporum f. sp. ciceri + M. incognita) of chickpea (cv. BG-256). The biopesticides were developed by involving novel technology patented in USA and India and were applied to seeds (5 g/kg seed) and soil (40 g/microplot) to evaluate their effectiveness against the target diseases under field conditions. The pesticides viz., carbendazim and nemacur were applied @ 1.25 kg a.i./h and 6.0 kg a.i./h as soil application, and 2g/kg seed as seed treatment. Chickpea grown in the plots infested with pathogens singly or concomitantly developed characteristic wilt and root-knot symptoms, and exhibited significant yield decline. Application of biopesticides checked the severity of the diseases and the resulting yield declines. Application of Biowilt-X decreased the wilt incidence by 60% and promoted the yield of chickpea (46%) grown in F. oxysporum f. sp. ciceri infested plots. The biopesticides Bionem-X and Biocure-X were found effective against root-knot disease and suppressed the galling by 20 and 12% and promoted the yield of infected chickpea plants by 28 and 34% in comparison to the control. Application of Biocure-X was found highly effective against the fungus-nematode wilt disease complex; its seed treatment substantially controlled the wilt and root-knot, and increased the yield of concomitantly infected chickpea by 49°C. Biocure-X was found more effective in increasing the nodulation as compared to other treatments. Effect of carbendazim and nemacur was significant (P Less Than 0.05) in checking the wilt, root knot and disease complex but were not as effective as biopesticides. The present study has demonstrated that biological management of wilt, root-knot and disease complex can be successfully achieved with the application of the developed biopesticides.