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Balagurunathan, R.
- Distribution and Spreading Pattern of Sugarcane Woolly Aphid, Ceratovacuna lanigera Zehntner in Sugarcane Fields
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PDF Views:124
Authors
Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 23, No 2 (2009), Pagination: 127-130Abstract
Sugarcane woolly aphid (SWA), Ceratovacuna lanigera Zehntner (Hemiptera: Aphididae) has been recorded as serious pest in the sugarcane growing belts of Tamil Nadu. Distribution pattern and mode of spread of woolly aphid and its natural enemies showed that initial influx of SWA on sugarcane commenced on 105 days after planting. The predator, Dipha aphidivora appeared on 119 days after planting. Maximum temperature and sunshine hours were positively correlated with the spread of the aphid, while relative humidity (%) (evening) and rainfall showed negative correlation. Colonization of the aphid was intense between September'05 and January'06 except in October'05 in which, number of D. aphidivora was noticed thus proving the efficiency of the predator against aphid. The occurrence of another predator, M. igorotus followed the same trend at a lower level of population. The abundance of the predators was found to be independent of weather factors, thus can act against SWA efficiently at various environmental conditions. The spread of the aphid within the field was in a spiral manner. Initially, the aphid colonization was influenced more by certain abiotic factors and when colonies had established, the spread was influenced mostly by biotic forces, particularly D. aphidivora. SWA and its natural enemies preferred the top leaves of the canopy followed by middle and bottom leaves.Keywords
Dipha aphidivora, Distribution, Micromus igorotus, Spreading Pattern and Sugarcane Woolly Aphid.Full Text
References
- Cheng, W. Y., Wang, Z. T., Hung, T. H. and Hung, J. K. 1992. Seasonal occurrence of the sugarcane woolly aphid and its predators on autumn planted canes. Report of Taiwan Sugar Research Institute, pp. 19-31.
- Susceptibility of Different Instars of Earias vittella (Fabricius) to Bacillus thuringiensis Insecticidal Proteins
Abstract Views :236 |
PDF Views:140
Authors
Affiliations
1 Department of Agric. Entomology, Tamil Nadu Agricultural University, Coimbatore-641003, Tamil Nadu, IN
2 Department of Biotechnology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola-444104, Maharashtra, IN
1 Department of Agric. Entomology, Tamil Nadu Agricultural University, Coimbatore-641003, Tamil Nadu, IN
2 Department of Biotechnology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola-444104, Maharashtra, IN
Source
Journal of Biological Control, Vol 21, No 2 (2007), Pagination: 217-221Abstract
The susceptibility of different instars of Earias vittella (Fabrieius) to Bacillus thuringiensis (Bt) insecticidal proteins (ICP) was studied. The LC50 of CrylAa, CrylAb, Cry1Ac, CryiC and Cry1E were 108.54, 97.04, 66.62, 1240.83 and 1335.60 ng/cm2, respectively to E. vittella neonates. The order of toxicity of different ICPs to second and third instar was Cry1Ac > CrylAb > CrylAa. Overlap 95 per cent fiducial limits at LC50 of CrylAa and CrylAb showed similar toxicity of these toxins to second and third instars of E. vittella. The possibility of these toxins and toxicity parameters in resistance management is discussed.Keywords
Bacillus thuringiensis, Earias vittella, Insecticidal Proteins, Median Lethal Concentration, Toxicity.Full Text