Studies on Management of Stem borer, Chilo partellus (Swinhoe) in Maize
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Date
2010
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Sardar Vallabhbhi Patel Universiy of Agriculture And Technology Meerut (U.P.)
Abstract
For present investigation entitled “Studies on management of stem borer, Chilo partellus (Swinhoe) in maize” the field experiments were conducted in randomized block design with three replications of seven treatments for two consecutive years i.e. "kharif, 2008 and 2009 at entomological research block of crop research centre, Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut (U.P.) 250110.
In extensive study, ten species of insects belonging to 6 orders were observed to be associated with the maize at experimentation location during the period of study. Among them, Chilo partellus (Swinhoe) was found as major pest. Maize aphid and leaf hopper were also found moderately damaging the crop. The other insect-pests recorded on the crop were of less importance and extent of their damage was found without much economic loss.
Among all the treatments, indoxacarb 14.5 SC @ 500 ml/ha was found best with minimum infestation of Chilo partellus 9.99 per cent (25 DAS) and 11.75 per cent (40 DAS) followed by endosulfan 35 EC @ 1.5 lit/ha. The maximum infestation of 36.23 per cent (25 DAS) and 38.29 per cent (40 DAS) was recorded with untreated control.
The minimum leaf injury of 1.15 (25 DAS) and 1.30 (40DAS) was recorded in plot treated with indoxacarb followed by endosulfan and imidacloprid.
The minimum number of dead hearts 2.69 (20 DAS) and 4.00 (40 DAS) were found with treatment of indoxacarb and next in order were the treatments of maize+cowpea (intercropping) and imidacloprid. The experimental crop treated with Indoxacarb was found best with minimum dead heart of 6.65 per cent and followed by maize+cowpea (intercropping) with 8.50 per cent dead heart. The minimum pooled tunnel length (1.37 cm) was found in indoxacarb and followed by endosulfan with stem tunneling of 3.53 cm.
All the treatments except maize+cowpea (intercropping) and T. chilonis were significantly superior in reducing the aphid and leaf hopper population. The minimum aphid population of 3.41, 5.05, and 6.15 at 30, 45 and 60 DAS, respectively was recorded in the treatment of indoxacarb and followed by endosulfan. Like wise Indoxacarb was also found best treatment with minimum population of 2.91, 3.72 and 5.08 at 30, 45 and 60 DAS, respectively. The second best treatment in reducing leaf hopper population was endosulfan.
The minimum population of coccinellids of 3.03, 2.33 and 2.33 at 30, 45 and 60 DAS, respectively was recorded in the treatment of indoxacarb. The maximum population of 11.00, 14.28 and 16.05 at 30, 45 and 60 DAS, respectively was recorded in untreated control and followed by maize+cowpea (intercropping) and T. chilonis which were highly safe to coccinellids population and were at par with untreated control. In case of spider population, the maximum population 5.21 (30 DAS), 7.21 (45 DAS) and 9.66 (60 DAS) was recorded in untreated control and was followed by maize+cowpea (intercropping) and T. chilonis. The minimum population 1.14 (30 DAS), 1.50 (45 DAS) and 2.85 (60 DAS) of spiders was found in treatment indoxacarb and followed by endosulfan respectively.
The maximum grain yield of 48.21 q/ha obtained from the Indoxacarb followed by endosulfan with the grain yield of 40.39 q/ha and imidacloprid with 38.08 q/ha. The minimum grain yield of 21.16 q/ha was reported in untreated control. The maximum increase in grain yield of 27.05 q/ha over control and highest cost benefit ratio of 10.79 was recorded with the treatment of indoxacarb and was followed by endosulfan, imidacloprid 17.8 SL (7 ml/kg seed), maize+cowpea (intercropping), and meemarin respectively. The maximum net profit of Rs. 21038.25/ha was obtained from the plots treated with indoxacarb followed by endosulfan, imidacloprid, maize+cowpea (intercropping) and neemarin with the net profit of 14953.50, 13041.75, 11011.25 and 9836.50 rupees/ha, respectively, while, the minimum net profit (Rs. 4214.50.00/ha) was estimated from the treatment of T. chilonis.
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Studies on Management of Stem borer, Chilo partellus (Swinhoe) in Maize