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Studies on Bitter Compounds of Melia azedarach and Podophyllum hexandrum for their Insecticidal Activities against Important Lepidopteran Pests of Cole Crops

CSK Himachal Pradesh Agricultural University Repository

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Title Studies on Bitter Compounds of Melia azedarach and Podophyllum hexandrum for their Insecticidal Activities against Important Lepidopteran Pests of Cole Crops
 
Creator Kumar, Rakesh
 
Subject 635.92 Injuries, Diseases, Pests
 
Description Different solvent extracts (petroleum ether extract, chloroform extract, dichloromethane extract, acetone extract, methanol extract, chloroform extract and water extract) of kernels, seeds, leaves and root bark of Melia azedarach were tested for repellent and antifeedant and further causing mortality to larvae of P. xylostella and P. brassicae. The chloroform extract of kernel at 4 per cent was found to give maximum repellency of 79.33 per cent to P. xylostella whereas at the same concentration the chloroform extract of seeds gave 60.89 and 92.67 per cent repellency to P. xylostella and P. brassicae, respectively. When antifeedant effect of these extracts was evaluated, the chloroform extract of kernel gave 100 per cent antifeedance at 4 per cent concentration to both the test insects whereas dichloromethane extract of leaves gave 95.63 and 99.84 per cent antifeedance to these insects. Mortality was also found to maximum at 4 per cent concentration in both the test insects. In petroleum ether extract it was 73.33 and 45.50 per cent to P. xylostella and P. brassicae. Methanol extract of roots and podophyllin from P. hexandrum was also tested for repellent, antifeedant and intrinsic toxicity to P. xylostella and P. brassicae, however, the maximum repellency of 77.33 and 98.67 per cent was observed only in podophyllin at 8.0 per cent to both of these test insects, respectively. The antifeedant activity was also found to be maximum (94.14 and 99.12%) in podophyllin at 8 per cent concentration to P. xylostella and P. brassicae larvae. The studies on intrinsic toxicity revealed that the larvae of P. brassicae were comparatively more susceptible than the larvae of P. xylostella to purified podophyllotoxin. For this compound the LC50 value for P. brassicae and P. xylostella was 11.12 ppm and 210 ppm, respectively. Ovicidal activity was found to be maximum at 8 per cent methanol extract of P. hexandrum roots. At this concentration 67.98 per cent hatchability was recorded in P. xylostella whereas no eggs were hatched at this concentration in P. brassicae.
 
Date 2009
 
Type Thesis
NonPeerReviewed
 
Format text
 
Language en
 
Identifier http://hillagricrepository.co.in/302/1/14145a.pdf
Kumar, Rakesh (2009) Studies on Bitter Compounds of Melia azedarach and Podophyllum hexandrum for their Insecticidal Activities against Important Lepidopteran Pests of Cole Crops. PhD thesis thesis, Dr. Y.S. Parmar University of Horticulture and Forestry.