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|Title:||Status and management of mirid bug, Creontiades biseratense (Distant) (MIRIDAE:HEMIPTERA) in Bt cotton|
|Abstract:||Studies on the “Status and management of mirid bug, Creontiades biseratense (Distant) (Miridae: Hemiptera) in Bt cotton” made during 2008-09 revealed that the incidence peaked during October-November months irrespective of the district surveyed and cultivars. Roving survey indicated, maximum incidence in Haveri (10.17 bugs/5 squares) district followed by Dharwad (6.03) and Belgaum (5.02). In fixed spot survey, the peak incidence appeared on 80 days old plants i.e., 21.20 bugs/5 squares in Devihosur and 9.20 in Dharwad. The crop loss estimation study in Bt cotton revealed an yield loss of 60.25 per cent in unprotected plots as against 7.26 per cent in 5 sprays received plots. Similar was the trend even in Non Bt cotton. The economic injury level for C. biseratense was worked out at 1.50 and 1.05 bugs/5 squares in Bt and non Bt cotton, respectively. Field screening of 32 intra and inter specific Bt cotton hybrids against mirid bug incidence revealed that not a single hybrid was found resistant to mirid bug. However, the hybrids viz., NCHB-992 and NCHB-990 among inter specific and Bajaranga, RCH-2Bt and NCH-145 Bt, RCH-530, Chiranjeevi, NCS-207 and MRC-7347 among intra specific Bt cotton hybrids and NCS-145 NBt harboured less population. Based on overall performance, NCS-145 Bt, RCH-2 Bt and Chiranjeevi were categorised as most promising. The mirid bug management studies revealed that acephate 75WP (@ 1.0 g/l) was found to be the most effective treatment followed by profenophos 50EC (2.0 ml/l), indoxacarb 14.5SC (0.5 ml/l), buprofezin 25SC (0.5 ml/l) and fipronil 5SC (1.0 ml/l). The biopesticides viz., M. anisopliae, V. lecanii and nimbecidine were less effective. The highest seed cotton yield was obtained in acephate treated plots (12.11q/ha) followed by profenophos (14.17q/ha), indoxacarb (12.88q/ha) and buprofezin (12.49q/ha).|
|Theme:||Status and management of mirid bug, Creontiades biseratense (Distant) (MIRIDAE:HEMIPTERA) in Bt cotton|
|Research Problem:||Status and management of mirid bug, Creontiades biseratense (Distant) (MIRIDAE:HEMIPTERA) in Bt cotton|
|Appears in Collections:||Thesis|
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