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Birsa Agricultural University, Ranchi
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ThesisItem Open Access Effect of Intercropping and Insecticides on Pest Complex of Cauliflower with Particular Reference To Diamond Back Moth(Birsa Agricultural University, Ranchi, 1997) Sanjay Kumar Sethi; Ravindra prasadThe present Investigation entitled “Effect of intercropping and insecticides on pest complex of cauliflower with particular reference to diamond back moth” was conducted in the insecticides compound of Birsa Agriculture University, Ranchi Bihar in the winter season of 1996-1997. During the course of investigation it was observed that significantly lower incidence of pest – complex viz. diamond back moth (DBM), aphid and the Bihar hairy caterpillar were recorded on cauliflower when it was intercropped with either marigold or coriander as compared with that of sole crop of cauliflower. Significantly the highest suppression of DBM the Bihar hairy caterpillar were recorded when foliar spraying of cypermethrin @ 0.1 Kg a.i/ha, applied over the crop thrice of three weeks interval all most remains at par with that of quinalphos and B.t. K. ( delfin) @0.5 Kg a.i/ha and0.75 kg/ha respectively . However ,aphid (Bravicoryne brassicae L.) was most effectively suppressed by three foliar spraying with cypermethrin @0.1 Kg a.i/ha applied at three weeks interval .B.T. K. (Delfin) was found to be ineffective against aphid. The interaction between intercropping and insecticides were found significantly effective in suppressing the population of DBM and the Bihar hairy caterpillar throughout the experimental period , however ,it was found significantly in respect of reduction in aphid population only up to 5 days after each of the three spraying with only to insecticides viz. quinalphos @0.5 kg a.i/ha and cypermethrin @ 0.1 kg a.i. /ha. Intercropping showed no any significantly effect on yield of cauliflower, though apparently higher yield (172 q/ha) was obtained when cauliflower was intercropped with coriander as compared to that of sole crop (156.68q/ha). Cypermethrin , quinalphos and B.t.k (Delfin) proved superior over untreated control and being at par among themselves on terms of yield . However, the highest yield (188.33 q/ha) was obtained when the crop was treated with cypermethrin and the lowest yield (117.42 q/ha) obtained when the crop was left untreated. The interaction between intercropping and insecticides proved significThesisItem Open Access Studies On Rice Leaffolder With Particular Reference Ton Varietal Resistance And Chemical Control(Birsa Agricultural University, Ranchi, 1990) Prasad, Anirudh; PremchandStudies were made on the biology of the insect, effect of damage by simulating various degrees of damahes, on yield attributes, screening for varietal and chemical control. Biology of the leaffolder was studied. Effect of three degrees of simulated damage were studied. Defoliation at 50 DAT appeared to adversely effect the yield attributes. Such as panicle bearing tiller, panicle length, grain weight and number of grains. Five cultivars have been identified which showed nil incidence as against 30.9% leaf damage in susceptible check TN1. Furadan 3G appeared to be the best insecticide recording the lowest percentage of leaf damage. However it was at par with coroban 10G mocap 10G and padan 4G. When percent productivity tiller is concerned all the treated but padan 4g were better than control. Highest yield was recorded under the treatment furadan 3G. The highest benefit cost ratio was obtained under the treatment trebon 10BCThesisItem Open Access Pest Complex of Brinjal As Affected By Varietal Resistance And Insecticidal Application(Birsa Agricultural University, Ranchi, 1990) Mandal, Sunil Kumar; S.P. ShawBrinjal is the most popular as well as important nutritive vegetable crop of India and is found growing in all the year round. Farmers of Chotanagpur region have taken brinjal cultivation in a big way as a cash crop. But, yield performance of brinjal is affected by different insect pests. Frempong et al. (1978) reported the occurance of about 140 species of insect peste under 50 different families of 10 orders on brinjal crops. The important pests of the tract are Jassid (Amranca blautulla biautulle Zahida), Aphid (Aphis gossypii Glov), Epilachna beetle (Epilachna vigintioctopunctata Fab), Bihar hairy caterpillar (Spilosong obliqua Walk) and Brinjal shoot and fruit borer (Leucinodes orbonalis Guan). The present investigations entitled "Post Complex of brinjal (Solanum melongong L.) as affected by varietal resis tance and insecticidal application" were conducted in the insec tory plot of Entomology Department and the sectional field of Horticulture Department of Birsa Agricultural University, Kanke, Ranchi, Bihar during monsoon-winter season, 1988-89.ThesisItem Open Access STUDIES ON THE EFFECTS OF VARIOUS FOOD -PLANTS ON THE GROWTH AND DEVELOPMENT OF B=DIACRISIA OBLIQUA AND ITS CONTROLS(Birsa Agricultural University, 1978) PRASAD, DEVENDRA; PREMCHANDResults of the effect of different food plants has opened a nar avenue for finding out the pretical utility of the toxic factor present in jorar and lantana upon which the caterpillars did not survive in the laboratory. Velvet bean, however, proved lethal in the laboratory as well as it was found free from damage by the Bihar hairy caterpillars. Regults of the chemical control suggest that the labomtory findings are not always successful to the same extent. Hence, field studies should be the basis of recommendationsof a pesticides against a particular insects. There is plenty of scope for conducting trials on the breeding and utilisation of Ganthecona bug in controlling the insects. Nuclear polyhedrosis has a potential value for the control of the insects. This may be taken up for a detailed study.ThesisItem Open Access Studies on Bionomics and Control of Rice Gall Midge(Birsa Agricultural University, 1981) Choudhary, Rajeev Kumar; PremchandSeveral grasses serve as alternate host of rice gall midge(orseolia oryzee wood – mason)with a view to know that how the population of rice hall midge develops on grasses, when rice crop is also standing in the field a fortnightly survey was conducted in and around university farm between july and September 1985. The gale midge could be found on three grasses viz eleusins indica recorded the maximum infestation in 3rd week of july and this was the peak period of activity . other two grasses viz. Eleusine indica,Bothriochloa sp. And paspalum sp. Eleusine indica recorded the maximum infestation in 3rd week of july and this was the peak period of activity. Other two grasses showed the incidence only in August. Occurrence of parasite (platygaster orysae cam.) on gall midge in case of grasses could be found in the 3rd week of july. It went on increasing till first week of September. Probably this high level of parasitism resulted in nil population of gall midge in the 3rd week of September. In case of rice , incidence of orseolia oryzae (wood mason) was recorded in the middle of August.The peak period of activity could be observed in last week of September. Later, a sharp fall in incidence was noticed. Polyembryonic species of parasite (platygaster oryzae cam.)was recorded from galled tillers of rice in last week of August. Level of parasitism increased gradually and reached its peak in the 4th week of October. This high level of parasitism probably reduced the gall midge population to nil in the first week of November. In the chemical control trial of rice gall midge quinalphos 50 gave better performace followed by rice husk + quinalphos EC in case of broadcast sowing followed by bushening.In this cultural practices, quinalphos 5G showed the lowest incidence and recorded the highest yield. As far as transplanting practice is concerned,Karanj cake powder + fenvalerate EC recorded the highest yield and maximum benefit cost ratio.Phorate 10G showed the lowest incidence and recorded the 2nd highest yield.ThesisItem Open Access Studies on The Bionomics and control of Diamond Back Moth(1980) Tigga, Lucretia; Tigga, Lucretia; Prem chand; Prem chandLaboratory studies were made on the bionomics of Plutella xylestslla incubation Perion , larval and pupal periods and their survival exhibited marked effect of fluctuations with little variations in atmospheric temperature. Total life cycle occupied shorter period during warmer months and longer during cooler months.
