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