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University of Agricultural Sciences, Dharwad (2014)

Management of sucking pests of rabi sorghum in the northern dry zone of Karnataka

Indhusri Chavan

Titre : Management of sucking pests of rabi sorghum in the northern dry zone of Karnataka

Auteur : Indhusri Chavan

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Master of Science in Agricultural Entomology 2014

Résumé
Studies on seasonal abundance of sorghum shoot bug and sugarcane aphid on rabi sorghum and their natural enemies, biophysical and biochemical parameters responsible for sorghum varietal resistance and management through soil organic amendments was carried out at College of Agriculture Bijapur during 2013-14. The crop sown during September 1st fortnight recorded significantly higher shoot bug population and plant damage than October month sown crop. Whereas, the highest aphid incidence and aphid index was recorded in 2nd fortnight of October sown crop and also higher population of coccinellids, Chrysoperla and spiders were recorded in the 2nd fortnight of October sown crop. Genotypes Phule vasudha and BJV 44 recorded lowest shoot bug population which has highest trichome density, more seedling vigour, more leaf glossiness. Whereas M 35-1 was moderately susceptible to aphid. Significant and negative correlation was observed between shoot bug population with trichome density of both upper and lower leaf surfaces and seedling vigour. Positive and non-significant correlation was observed with leaf glossiness. Negative and nonsignificant correlation was observed between the aphid density with trichome density of both the leaf surfaces and seedling vigour at 14 DAE. Positive non-significant correlation was observed with seedling vigour at 21 DAE. Positive and non-significant correlation was observed between shoot bug populations and reducing sugars. Whereas total sugars and total phenols were negatively correlated. Application of neem cake 6.25 q/ha and FYM 50% + neem cake 50% recorded least shoot bug, aphid density and plant damage were found superior over application of RDF 100% and untreated control and also recorded better grain and fodder yield as compared to untreated control

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