Role of Tall Growing Millet Crops in the Biological Suppression of Aphid, Myzus Nicotianae Blackman in Bidi Tobacco
An experiment was conducted for thrcc consccutive scasons at Regional Agricultural Research Station, Nandyal, from 2002-03 to 2004-05 using diffcrent tall growing millets as border crops alone (sorghum, maize and bajra), border crop with one spray of imidacloprid at 35 days after transplanting and spraying of only chemicals, imidacloprid 18.5%, SL and accphate 75% WP at 35 days after transplanting and 55 days after transplanting, respectively, with an aim to suppress thc aphid, Myzus nocotianae in bidi tobacco. On border crops, predators like Coccinella Sp. (1.95), chrysopidis (1.20), spiders (0.85) and syrphids (0.35) were recorded. Highest natural enemy population was recorded on sorghum (8.12 per plant), followed by maize (4.31 per plant) and bajra (2.56 per plant). Cyrtopeltis bugs (3.1) and coccinellids (0.17) were recorded on tobacco. Highest cured leaf yield or 1246 kg/ha was recorded when sorghum was border crop and one spray of imidacloprid was givcn at 35 days after trannsplanting. Significantly higher yield was recorded in treated plots as compared to control (1044.5 kg/hal and among the treatments there was no significant difference.
Biological Supression, millet crops, Myzus nocotianae Tobacco Aphid
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