Author: Gagandeep Singh, Amit Kumar and Vijay Kumar
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Maize Zea mays L., 1753 (Poaceae) has worldwide enormous economic importance because of its use in food for humans and livestock. Considering the effects of maize stem borer on maize crop yield reduction, health risks associated with chemical insecticides, and the high cost of chemical insecticides, a field experiment was conducted at the Agronomical Instructional farm and Department of Entomology, Rajasthan College of Agriculture, Udaipur, during Kharif, 2018 to compare the performance and economic efficacy of various bio pesticides against maize stem borer, as well as their impact on maize yield performance. The highest grain yield was recorded in spinosad 35 % EC (42.00 q/ha) followed by Bt (39.00q/ha), NSKE 5% (38.00 q/ha), Beauveria bassiana (35.00 q/ha), Metarhizium (33.00 q/ha) and Azadirachtin1500 ppm (30.00 q/ha), while, highest B: C ratio (22.87) was recorded in spinosad followed by Bt (17.68), Beauveria bassiana (10.31), NSKE 5% (8.77) and Metarhizium (6.99) and lowest in Azadirachtin 1500 ppm (2.34).
Maize, Maize Stem Borer, Bio Pesticides, Economic, B: C ratio, Azadirachtin
It can be concluded from the present investigation that Spinosad was highly effective for Stem borer population control and highest net returns as well (21342.86 Rs/ha /) the BC ratio is highest in case of Spinosad (1:22.87) followed by Bacillus thuringiensis (1:17.68). It should be advised to the maize growing area of Udaipur as well India to use Spinosad and Bacillus thuringiensis based products for maximum reduction of Maize stem borer population without residual effect in dry matter of basil plant parts. Bio pesticides could be applied when stem borer are few Beauveria can be suggested for a better yield without using chemical pesticide. It can be also suggested in case the farmers look for a more cost-effective control owing to their high BC ratio. Therefore, Spinosad and Beauveria bassiana might be used as insecticide for ecofriendly and cost-effective management of maize stem borer.
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