Bio-ecology and Management of Corcyra cephalonica Stainton under Sub humid Southern Zone of Rajasthan

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Date
2014
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MPUAT, Udaipur
Abstract
The present investigations on “Bio-ecology and Management of Corcyra cephalonica Stainton under Sub humid Southern Zone of Rajasthan” were carried out under laboratory condition, Department of Entomology, Rajasthan College of Agriculture, Udaipur during, 2010 to 2012. The study conducted on extent of damage of C. cephalonica in maize under different storage structures in Rajsamand, Chittorgarh and Udaipur districts revealed that the maximum infested grain samples (61.53%) were recorded from grain stored in loose storage during June-July, 2011. Whereas, infested grain samples were not found from the grain stored in metal bin during November-December, 2010. The maximum weight loss (7.46%) was recorded in grain samples collected from loose storage in Udaipur district during June-July, 2011. No weight loss in grains were recorded in the samples collected from metal bin in Chittorgarh and Udaipur district during November-December 2010. In the quantitative and qualitative studies revealed that the maximum germination (78.00%) and protein content (8.60%) were recorded in the samples collected from metal bin in Chittorgarh district during November-December, 2010, while maximum carbohydrate content (72.00%) was recorded in maize samples collected from metal bin in Rajsamand district during November-December 2010. The minimum germination (62.00%) and carbohydrate content (66.50%) were recorded in maize samples collected from loose storage in Udaipur district whereas, minimum protein content (6.70%) were recorded from loose storage in Chittorgarh district during June-July 2011. * Ph.D. Scholar, Department of Entomology, Rajasthan College of Agriculture, MPUAT, Udaipur (Raj.) ** Professor, Department of Entomology, RCA, MPUAT, Udaipur (Raj.) The studies conducted on effect of host on the biology of C. cephalonica revealed that the minimum hatching period (4.25 days) was observed on pearlmillet and maize and maximum on groundnut (5.50 days). The minimum larval period (32.50 days) was recorded on pearlmillet and maximum was on oat (45.25 days). The maximum larval weight was recorded with pearlmillet (52.25 mg) and minimum on oat (38.50 mg). The minimum pupal period was recorded on pearlmillet and maize (9.50 days) and maximum on oat (11.25 days); while maximum pupal weight was recorded on pearlmillet (38.50 mg) and minimum on oat (32.00 mg). The maximum adult emergence was recorded on pearlmillet (79.00%) and minimum on groundnut (65.00%). The Growth Rate Index was maximum on pearlmillet (1.71) and minimum on groundnut (1.07). The highest fecundity of female (302.50 eggs/female) was recorded on maize and minimum was on groundnut (225.50 eggs/female). The maximum longevity period of female (7.25 days) was recorded on wheat and minimum on sorghum (4.50 days); whereas the maximum adult male longevity was (10.25 days) recorded on pearlmillet and minimum was on sorghum (8.00 days). The minimum developmental period was recorded on pearlmillet (46.25 days) and maximum was on oat (61.25 days). The studies conducted on effect of temperature and relative humidity on the growth and development of C. cephalonica revealed that the development period of male and female was minimum at 40°C temperature and 80 per cent relative humidity with a mean of 35.70 and 31.30 days, respectively. Whereas the development period of male and female was maximum with a mean of 89.50 and 92.00 days at 20°C temperature and 40 per cent relative humidity, respectively. The minimum larval period (22.70 days) was recorded at 40°C temperature and 80 per cent relative humidity, whereas the maximum larval period of (70.10 days) was recorded at 20°C temperature and 40 per cent relative humidity. The maximum weight of full grown larva (51.00 mg) was recorded at 30°C temperature and 80 per cent relative humidity and minimum larval weight (33.00 mg) was observed at 20°C temperature and 40 per cent relative humidity. The maximum pupal period of male (13.60 days) and female (14.40 days) were observed at 20°C temperature and 40 per cent relative humidity. Whereas, the minimum pupal period of male (8.40 days) and female (9.85 days) was recorded at 30°C temperature and 80 per cent relative humidity. The higher weight of male (36.00 mg) and female (38.00 mg) pupa were observed at 30°C temperature and 80 per cent relative humidity, whereas lowest pupal weight of male (21.00 mg) and female (23.00 mg) pupa were observed at 20° C temperature and 40 per cent relative humidity. The maximum adult emergence of male (61.40%) and female (80.90%) were observed at 30°C temperature and 80 per cent relative humidity and minimum were male (35.10%) and female (54.90%) at 20°C temperature and 40 per cent relative humidity. The maximum adult longevity of male (16.30 days) and female (10.50 days) were observed at 20°C temperature and 40 per cent relative humidity while minimum adult longevity of 3.05 (male) and 2.81 (female) days were observed at 40°C temperature and 80 per cent relative humidity. The maximum growth rate index of male (1.35) and female (1.64) were recorded at 30°C temperature and 80 per cent relative humidity while minimum growth rate index male (0.39) and female (0.60) were observed at 20°C temperature and 40 per cent relative humidity. The efficacy of different grain protectants against C. cephalonica revealed that the highest larval mortality (82.20%), pupal mortality (10.00%) and minimum adult emergence (6.00%) were recorded in case of application neem leaf powder at 10g/kg seed, after 40 days of release. Application of wood ash at 15g/kg seed was found least effective. The studies conducted on varietal screening against C. cephalonica revealed that the maximum development period (68.00 days), minimum adult emergence (62.50%) and lowest weight loss (18.50%) were observed on Pratap Hybrid Maize-1. Among the different storage structures the pusa bin was most efficient storage structure where minimum quantitative losses due to C. cephalonica was recorded at 120 days. The gunny bag exhibited highest weight loss in stored maize due to C. cephalonica.
Description
Bio-ecology and Management of Corcyra cephalonica Stainton under Sub humid Southern Zone of Rajasthan
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Citation
Meena and Rana, 2014
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