Informatics Publishing Limited

Javare Gowda , V. Maheswarappa , L. Krishna Naik

Abstract

Teak defoliator (Hyblaea puera Cramer) is the most devastating insect pest on Teak which causes heavy defoliation in its larval stage. The outbreak of this moth is noticed during June to September. A light trap was installed in Teak plantation to study the effect of various weather parameters. The path analysis of five associated weather parameters indicated that, on the outbreak of moth rainfall had positive direct effect on emergence of male and female moth during 2003-04 and 2004-05 (0.7079 r= 0.7920; 0.7308 r= 0.7904 and 0.4608 r= 0.4342; 0.5555 r= 0.5018, respectively). Indirectly relative humidity in the evening through rainfall influences the outbreak of male moth (0.1947 r= 0.4549) and through maximum temperature it influences emergence of female moth (0.2110 r= 0.4175) during 2003-04. Similarly, relative humidity in the morning through relative humidity in the evening influences the outbreak of male and female moth (0.8190 r= 0.1402; 0.7988 r= 0.1688, respectively) during 2004-05.

Keywords

Teak Defoliator, Hyblaea puera Cramer, Weather Parameters, Path Analysis,
Uttara Kannada District, Karnataka

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S. N. Jadhav ¹, L. Krishna Naik ², G. T. Basavaraj ³, S. S. Chavan ¹

Affiliations
1 Department of Agricultural Entomology, University of Agricultural Sciences, Dharwad karnataka, IN
2 Directorate of Extension, University of Agricultural Sciences, Dharwad karnataka, IN
3 AICRP on Soybean, University of Agricultural Sciences, Dharwad karnataka, IN

Abstract

Thirty seven genotypes were screened against stem fly during Kharif 2006 and 2007 seasons. The genotypes NRC-55, NRC-51, NRC-52 and DSb-101 were recorded significantly lower stem fly incidence and stem tunnelling per cent compared to rest of the genotypes. The promising MACS-798, MACS-740, MACS-817 and DSb-102 were also recorded stem fly incidence and stem tunnelling and found next best to NRC's and DSb-101 genotypes but proved superior over national check. The genotypes MAS-2000-1 and KHSb-2 were recorded higher stem fly incidence and stem tunnelling and found significantly inferior among the genotypes. Among the genotype NRC-55, NRC-51, and Dsb-101 were categorized as resistant. Moderately resistant genotypes include, MACS-798, MACS-740, MACS-817, NRC-52 and DSb-102 and susceptible genotypes includes MAS-2000-1 and KHSb-2. Further remaining twenty seven genotypes were categorized as moderately susceptible.

Keywords

Soybean, Stem Fly, Infestation,tunnelling, Resistance, Susceptible Melenogromyza Sojae

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S. N. Jadhav ¹, L. Krishna Naik ², R. H. Patil ¹, S. S. Chavan ¹

Affiliations
1 Department of Agricultural Entomology, University of Agricultural Sciences, Dharwad karnataka, IN
2 Directorate of Extension, University of Agricultural Sciences, Dharwad karnataka, IN

Abstract

A roving survey was undertaken in four districts of major soybean growing areas of northern Karnataka viz., Dharwad, Belgaum, Bagalkot and Bidar during Kharif 2006 and 2007. The average higher per cent stem fly incidence of 63.48 and 61.80 was recorded in Belgaum and Bidar districts, respectively. The lower stem fly incidence (12.67%) was recorded in Dharwad district and moderate incidence (22.91%) was noticed in Bagalkot district. The average higher per cent stem tunnelling of 29.83 and 28.69 was recorded in Belgaum and Bidar district, receptively. The moderate (10.57%) stem tunnelling was in Bagalkot district, while it was lower (8.17%) stem tunnelling in Dharwad district.

Keywords

Survey, Stem Fly Infestation, Stem Tunnelling, Soybean

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