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University of Agricultural Sciences, Dharwad

The University of Agricultural Sciences, Dharwad was established on October 1, 1986. The University has 5 Colleges, 27 Research Stations, 6 Agriculture Extension Education Centers, 6 Krishi Vigyan Kendras and ATIC. The University has its jurisdiction over 7 districts namely Bagalkot, Belgaum, Bijapur, Dharwad, Gadag, Haveri, and Uttar Kannada in northern Karnataka. Greater diversity exists in soil types, climate, topography cropping and farming situations. The jurisdiction includes dry-farming to heavy rainfall and irrigated area. Important crops of the region include sorghum, cotton, rice, pulses, chilli, sugarcane, groundnut, sunflower, wheat, safflower etc. The region is also known for many horticultural crops. Considerable progress has been registered in the field of education, research and extension from this University.

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Subject: Agricultural Entomology × Author: Bheemanna ×
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    ThesisItemOpen Access
    Response of field populations of helicoverpa armigera (hubner) to bt cotton (cry1ac) and its management
    (UAS, Dharwad, 2008) Bheemanna; B.V.Patil
    Studies on response of Helicoverpa armigera collected from different cotton growing areas of Karnataka to Cry1Ac, synchrony in H. armigera adult emergence from Bt cotton and other alternate hosts, estimation of crop yield gain in Bt cotton against bollworms, validation of integrated resistance management (IRM) strategy to Bt cotton and exploitation of Bt cotton as a trap crop in conventional cotton pest management were carried out at RARS, Raichur. The maximum LC50 of 0.028 μg/ml of diet was recorded in Raichur population. In late season, higher LC50 values of 0.037 and 0.026 μg/ml of diet were recorded in Dharwad and Raichur populations, respectively. But there was no significant difference among six different populations of H. armigera response to Cry1Ac toxin. The total number of H. armigera moths emerged from Bt and non Bt cotton were 6.60 per cent and 42.80 per cent, respectively and total per cent emergence of H. armigera moths from red gram was maximum (95.60%). In late season, moths emerged from Bt cotton were very less (10.80%). On cultivated Bt cotton, larval survivability was from zero to 0.16 larvae per plant as compared to 0.00 to 1.56 larvae/plant in non Bt cotton. Reaction of different Bt cotton hybrids against bollworms indicated that RCH-144Bt recorded maximum GOB per plant (59.17/plant) which was on par with RCH-371Bt (55.71/plant) and RCH-2Bt (54.67/plant). Significantly highest seed cotton yield of 19.60q/ha was recorded in RCH-144Bt. Bt IRM recorded significantly superior seed cotton (38.73 q/ha) yield compared to Bt farmers practice (35.92 q/ha). The net profit per ha was maximum in Bt IRM module (Rs. 68392/ha) as compared to Bt farmers practice (Rs. 59875/ha). Cotton IPM plot and Bt border trap crop treatment recorded maximum good opened bolls (41.93 and 42.11/plant) with least bad opened bolls (9.17 and 10.22/plant). These two treatments also excelled and registered higher seed cotton yield of 20.60 and 20.60 q/ha respectively.
  • Thumbnail Image
    ThesisItemOpen Access
    Response of field populations of helicoverpa armigera (hubner) to bt cotton (cry1ac) and its management
    (UAS Dharwad, 2008) Bheemanna; B.V.Patil
    Studies on response of Helicoverpa armigera collected from different cotton growing areas of Karnataka to Cry1Ac, synchrony in H. armigera adult emergence from Bt cotton and other alternate hosts, estimation of crop yield gain in Bt cotton against bollworms, validation of integrated resistance management (IRM) strategy to Bt cotton and exploitation of Bt cotton as a trap crop in conventional cotton pest management were carried out at RARS, Raichur. The maximum LC50 of 0.028 μg/ml of diet was recorded in Raichur population. In late season, higher LC50 values of 0.037 and 0.026 μg/ml of diet were recorded in Dharwad and Raichur populations, respectively. But there was no significant difference among six different populations of H. armigera response to Cry1Ac toxin. The total number of H. armigera moths emerged from Bt and non Bt cotton were 6.60 per cent and 42.80 per cent, respectively and total per cent emergence of H. armigera moths from red gram was maximum (95.60%). In late season, moths emerged from Bt cotton were very less (10.80%). On cultivated Bt cotton, larval survivability was from zero to 0.16 larvae per plant as compared to 0.00 to 1.56 larvae/plant in non Bt cotton. Reaction of different Bt cotton hybrids against bollworms indicated that RCH-144Bt recorded maximum GOB per plant (59.17/plant) which was on par with RCH-371Bt (55.71/plant) and RCH-2Bt (54.67/plant). Significantly highest seed cotton yield of 19.60q/ha was recorded in RCH-144Bt. Bt IRM recorded significantly superior seed cotton (38.73 q/ha) yield compared to Bt farmers practice (35.92 q/ha). The net profit per ha was maximum in Bt IRM module (Rs. 68392/ha) as compared to Bt farmers practice (Rs. 59875/ha). Cotton IPM plot and Bt border trap crop treatment recorded maximum good opened bolls (41.93 and 42.11/plant) with least bad opened bolls (9.17 and 10.22/plant). These two treatments also excelled and registered higher seed cotton yield of 20.60 and 20.60 q/ha respectively.