Vol. 11, Issue 6 (2022)

Author(s):
Manoj Kumar Chandraker, Dhanendra Kumar Rana, Bhagwat Saran Asati and Santosh Sahu

Abstract:
The efficacy of certain botanicals and microbial agents was tested against DBM in the research field of Pt. KLS College of Horticulture and Research Station, Rajnandgaon during 2016-17 and 2017-18. Among the treatments, Spinosad 2.5% EC @ 1.4 ml l^-1 found most effective treatment against DBM recorded minimum population of 1.80, 1.40, 0.90, 1.07 and 1.97 & 1.80, 1.27, 1.10, 1.33 and 2.43 larvae plant^-1 at 1, 3, 5, 7 and 10 days after first and second sprays, respectively with maximum yield (243.32 q ha^-1), high net returns (Rs 50,012.00 ha^-1) and maximum cost benefit ratio (1:2.61). Among the microbial agent, Bacillus thuringiensis @ 2 g l^-1 was found second most effective treatment against DBM followed by NSK based (Azadirachtin 1% EC) @ 3 ml l^-1, NSK based (Azadirachtin 0.15% EC) @ 5 ml l^-1, Beauveria bassiana @ 2 g l^-1, Metarhizium anisopliae @ 2 g l^-1, dhenu astra @ 5 ml l^-1, neem oil (Pure extract) @ 5 ml l^-1 and karanj oil (Pure extract) @ 5 ml l^-1 were effectively decrease the larval population of DBM. On the basis of percent reduction of larval population over control, treatment spinosad 2.5% EC was found superior with 69.56 and 67.97 per cent population reduction after first and second spray, respectively.