Browsing by Author "Rama Rao, C.V"
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ThesisItem Open Access Biology and management of groundnut pod borer Caryedon serratus (Olivier) in groundnut pods(ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD, 2005) SANDEEP, R.S.; Rama Rao, C.VThe present investigations were undertaken to study the biology of Caryedon serratus (Olivier) on groundnut pods and the relative efficacy of some plant products under laboratory conditions at Post Harvest Technology Center, Agricultural College, Bapatla during the year 2004-2005. The Pre-oviposition and oviposition periods of C. serratus ranged from 1.04 to 2.41 days and 3 to 16 days, respectively. The egg, larval and pupal periods ranged from 3 to 9, 19 to 38, 9 to 34 days with an average of 6.25, 31.21, 26.55 days, respectively. The fecundity of female ranged from 15 to 85 eggs with an average of 35.44 eggs/female. The adult longevity and total life cycle ranged from 19 to 30 and 43 to 70 days with an average of 19.62 and 57.16 days, respectively. The average length of egg, larva, pupa and adult was 1.00 mm, 7.28 mm, 6.93 mm and 6.22 mm, respectively, whereas the average breadth of the respective life stages was 0.71 mm, 2.61 mm, 2.80 mm and 2.81 mm, respectively. The study on relative efficacy of some grain protectants i.e. neem kernel powder, Acorus calamus rhizome powder, karanja seed powder Lantana camara leaf powder, Ocimum canum leaf powder and eucalyptus leaf powder each at 1% concentration (mixed with groundnut pods), neem oil, karanja oil, mustard oil, castor oil, sesamum oil and citronella oil each at 1% concentration (gunny bag treatment) and proven check deltamethrin @ 0.02% concentration revealed that A. calamus rhizome powder was effective in controlling oviposition and pod damage by C. serratus upto 150 and 180 days, respectively. The L. camara leaf powder was effective upto 30 and 120 days after treatment in restricting oviposition and pod damage, respectively. The O. canum leaf powder recorded 25.94 and 26.30 per cent pods with eggs and pod damage, respectively and gave protection upto 120 days after treatment. Karanja seed powder controlled oviposition upto 30 days and pod damage upto 90 days where as neem kernel powder recorded 76.23 and 63.48 per cent pods with eggs and pod damage, respectively at 180 days after treatment. The least effective was eucalyptus leaf powder. Among the oils tested by treating the gunny bags, neem oil and castor oil protected groundnut pods upto 180 days after treatment with zero per cent pods with eggs and zero per cent pod damage by C. serratus. Citronella oil provided protection against oviposition upto 120 days and controlled pod damage upto 150 days after treatment. It was followed by Karanja oil and the least effective was sesamum oil. Deltamethrin a proven check controlled oviposition and pod damage by C. serratus upto 180 days after treatment. Besides, this the plant products and plant oils did not affect the germination of groundnut kernels.ThesisItem Open Access Biology and management of Maruca vitrata in redgram(ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, 2008) HARITHA, B; Rama Rao, C.VStudies on “Biology and management of spotted pod borer, Maruca vitrata (Geyer) on redgram” were conducted at lam farm and in the laboratory, pulses section, lam farm, Guntur during Kharif 2007-2008. Larval incidence of M.vitrata on redgram was first noticed on 17th December and reached on a peak on 15th January coinciding with maximum flowering stage, thereafter population gradually declined. Multiple regression analysis indicated that all the weather variables (maximum and minimum temperatures, morning and evening relative humidity, rainfall) together accounted for 82.1 per cent variation in larval population (R 2 = 0.821) which was significant. However, only minimum temperature showed significant influence independently on variation in larval population. Laboratory studies on biology of M.vitrata on redgram showed that the egg period lasts for 3.60 days. The larva had five instars with mean larval duration of 10.90 days. The pupal period lasted for 6 days. The adults emerged from the pupa with a longevity of 4.10 days. Total life cycle lasted for 24.60 days. Among the twelve insecticides evaluated for their efficacy against M.vitrata, treatments like spinosad (0.015%) and proclaim (0.0025%) were effective in suppressing the inflorescence damage. Next effective treatments were flubendiamide (0.006%), novaluron (0.01%), indoxacarb (0.0145%), thiodicarb (0.075%), rynaxypyr (0.009%), lufenuron (0.01%), chlorpyriphos (0.05%) + dichlorvos (0.1%), pyridalyl (0.002%). Spinosad, rynaxypyr,novaluronand proclaim were found effective in reducing pod damage by 52.10,45.78,45.41 and 44.96 per cent overcontrol respectively. Higher yields were obtained in plots treated with spinosad (1518.40 kg/ha), indoxacarb (1388.16 kg/ha) and flubendiamide (1335.76 kg/ha).ThesisItem Open Access Studies On Keeping Quality Of Duck Versus Chicken Eggs(College of Animal Sciences Chaudhary Charan Singh Haryana Agricultural University Hisar, 1980) Rama Rao, C.V; Tripathi, V. N