Studies on Field Evaluation of Bio-pesticides And Bio-agent Against Stem Borer, Chilo Parte/ius (Swinhoe) in Maize

Abstract

An experiment entitled "Studies on Field Evaluation of Bio-pesticide and Bio-agent against stem borer Chilo parte/Ius (Swinhoe) on maize• with seven treatments 0 and three replication in RBD was conducted during Kharif, 2007 at Crop Research Centre (CRC) of Sardar Vallabh Bhai Patel University of Agriculture and Technology Meerut (U.P.)- 250110. However, the treatment with chemical insecticide i.e. lmidacloprid 17.8% SL @ 150 mllh was found best among all the treatments with minimum infestation of 15.33 per cent (20 DAS) and 16.53 per cent (40 DAS). minimum leaf injury rating 2.09 (20 DAS) and 2.41 (40 DAS), minimum number of dead hearts 2.02 (20 DAS) and 2.60 (40 DAS) and minimum 7.43 per cent of dead hearts (40 DAS). This treatment was also found best with highest grain y1eld (36.29 qlha), maximum increase in yield (16.58 q/ha) over control, maximum net returns {Rs.11185.00 lha) and highest cost benefit ratio (9.9). On the other hand Neem based insecticide was performed best among bio-pesticides, bio-agent and Neem based insec!Jcide with the treatment 59 Neemann@ 3.0 liVha Wlth Infestation of 17 17 percent (20 DAS) and 18.90 per cent (40 DAS), leaf injury rating 3.14 (20 DAS) and 3.32 (40 DAS), number of dead hearts 5.12 (20 DAS) and 5.92 (40 DAS) and 16.90 per cent of dead hearts (40 DAS). This treatment was also found best With grain yield (30.32 qlha), increase m yield (10.58 q/ha) over control, net returns (Rs 7935.00 lha) and cost benefit ratio (6.1 ).The bio-agent Trichogramma chl/onis @1 lac eggs/ha was found better after the treatment Neemarin @ 3.0 lit/ha and it performed with infestation of 17.93 per cent (20 DAS) and 19.40 per cent (40 DAS), leaf injury rating 4.13 (20 DAS) and 4.31 (40 DAS), number of dead hearts 6.11 (20 DAS) and 6.44 (40 DAS) and 18.40 per cent of dead hearts (40 DAS). This treatment was also found best with grain yield (28.54 q/ha), increase in yield (8.83 qlha) over control, net returns (Rs.6622.50 lha) and cost benefit rat1o (6. 6). Among bio-pesticides the treatment Beauveria bassiana @ 2.5 kglha was performed better than Bacillus thuringiensis @ 1.0 kg/h and this treatment was observed with infestation of 18.40 per cent (20 DAS) and 20.47 per cent (40 DAS), leaf injury rating 5.04 (20 DAS) and 5.42 (40 DAS), number of dead hearts 6.20 (20 DAS) and 6.74 (40 DAS) and 19.27 per cent of dead hearts (40 DAS). The treatment Beauveria bassiana @ 2.5 kglha was also observed better than Bacillus thuringiensis @ 1.0 kglh with grain yield (26.36 qlha). increase in yield (6.65 qlha) over control, net returns (Rs.3862.50 lha) and cost benefit ratio (4.4). The treatment with Bacillus thuringiensis @ 1.0 Kg/ha was recorded safest to the natural enemies (spider) and followed by the Beauveria bassiana @ 2.5 Kglha.