Studies on biology and behavior of Earias vittella (Lepidoptera: Noctuidae) for mechanisms of resistance in different cotton genotypes

Dhillon, M K and Sharma, P D (2004) Studies on biology and behavior of Earias vittella (Lepidoptera: Noctuidae) for mechanisms of resistance in different cotton genotypes. Crop Protection, 23 (3). pp. 235-241.

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Spotted bollworm, Earias vittella (Fab.), is one of the most important insect pests of cotton, and host plant resistance is an important component for the management of this pest. The antixenosis and antibiosis components of resistance to this pest in five Gossypium hirsutum (HS 6, HHH 81, PCHH 31, Somnath, SS 9) and one Gossypium arboreum (HD 107) genotypes were undertaken at 28±2°C and 70±5% relative humidity under laboratory conditions. The larval period ranged from 8.2 to 9.2 days on buds and 9.2-12.2 days on bolls of different cotton genotypes. The mean larval period irrespective of food was significantly shorter in G. arboreum as compared to G. hirsutum cultivars. Pre-oviposition period (2.42 days) was longer on G. arboreum genotype than on G. hirsutum genotypes (1.44-2.00 days), while the reverse was true for oviposition and post-oviposition periods. Larval survival, pupation, adult emergence, fecundity, incubation period, and egg hatchability were significantly lower on G. arboreum than on G. hirsutum. The first- and third-instar larvae of spotted bollworm preferred buds than bolls in both, G. arboreum and G. hirsutum genotypes. Multi-choice assays on larval preference for buds and bolls among different genotypes revealed that the preference for buds of G. arboreum was significantly higher by the first-instar and lower by the third-instar larvae than the G. hirsutum variety and hybrids. G. hirsutum cultivars were more preferred than the G. arboreum variety, and among the plant parts the lower leaf surface, buds and bolls were preferred over the other plant parts for egg laying by the female. The interactions between E. vittella larvae and cotton genotypes are quite diverse, and there is a distinct possibility for increasing the levels and diversifying the basis of resistance to this pest by intensive breeding program.

Item Type: Article
Subjects: Others > Agriculture-Farming, Production, Technology, Economics
Depositing User: Library ICRISAT
Date Deposited: 10 Sep 2011 08:14
Last Modified: 10 Sep 2011 08:14
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Acknowledgement: The authors wish to thank Professor and Head, Department of Entomology, C.C.S. Haryana Agricultural University, Hisar, India for providing the facilities to conduct the experiment and Dr. R.S. Gill, Entomologist cotton, Punjab Agricultural University, Ludhiana, Punjab, India for providing seed of hybrid PCHH 31 and Dr. H.C. Sharma, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 152324, India for going through the manuscript and giving valuable suggestions.
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