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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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Thesis Type: M.Sc × Author: A.J.Umesha ×
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    ThesisItemOpen Access
    Studies on seasonal incidence and management of apion amplum (faust) (apionidae: coleoptera) on greengram
    (UAS, Dharwad, 2006) A.J.Umesha; K.Basavana Goud
    Investigations on the seasonal incidence, monitoring by light trap, economic injury level and management of A. amplum by intercropping and insecticides were carried out during kharif 2005-06. Studies on the seasonal incidence of the seed weevil, A. amplum on greengram revealed that peak activity of the pest on greengram was noticed on the crop sown during the month of July, which recorded highest mean population of weevils (6.96 weevils/plant), highest per cent pod (63.30%) and seed damage (69.68%), whereas complete absence of the pest was noticed on the crops sown from December to April. Monitoring of A. amplum using modified ICRISAT light trap revealed that two peaks were observed on weevil abundance i.e., on 30th and 40th standard weeks, which coincided with peak field incidence of the pest. Correlation between trap catches and weather parameters revealed that trap catches of A. amplum had significant positive correlation with minimum temperature, morning relative humidity, evening relative humidity and also rainfall, but trap catches had highly significant negative correlation with minimum temperature. Determining of economic injury level (EIL) for seed weevil A. amplum on greengram revealed that EIL of seed weevil was 1.02 weevils/plant. Investigations on the management of seed weevil by intercropping revealed that greengram grown with pigeonpea and maize in the ratio of 4:2 and 2:1, respectively minimized the activity of weevil. Significantly higher greengram equivalent yield was recorded in redgram (9.95 q/ha) and maize (9.74 q/ha) intercropping system. Evaluation of different insecticides under field conditions revealed that application of fenvalerate @ 20 kg/ha and spinosad @ 0.2 ml/l was found effective in reducing the weevil population, pod and seed damage to greegram. When the cost effectiveness was considered, fenvalerate dusting @ 20 kg/ha and chlorpyriphos @ 2 ml/l spray recorded highest C:B ratio of 1:2.23 and 1:1.86, respectively.