Loading...
Theses
Browse
16 results
Search Results
ThesisItem Open Access Fumigant toxicity and long term efficacy of some essential oils and their combinations against insect pests of stored grain(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-07) Bhatt, Maya; Tiwari, S.N.Experiment were conducted in the Post-Harvest Entomology Laboratory of Department of Entomology, G. B. Pant University of Agriculture & Technology, Pantnagar, to study the fumigant toxicity and long term efficacy of four essential oils and their combination against stored grain insect pests Sitophilus oryzae, Rhizopertha dominica, Tribolium castaneum and Callosobruchus chinensis. Lethal concentration was calculated for each four essential oils at 40, 80, 160, 370 and 750 µL/L (Kim and Ahem, 2001 method) and at 0.09, 0.19, 0.39, 0.78 and 1.56 µl/ cm2 (Tapondjou et al., 2004 method). Result showed that adults of R. dominica and C. chinensis were most susceptible to fumigant action that S. oryzae and T. castaneum. Fumigant toxicity of essential oils was dependent on dose and exposure period. Same combination of essential oils were effective against insect pests of stored cereals for six monthsThesisItem Open Access Studies on biophysical basis of resistance in pigeonpea genotypes against pod borer complex(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-08) Verma, Sunil; Maurya, R.P.The present investigation was carried out at Norman E. Borlaug Crop Research Centre, G.B. Pant University of Agriculture and Technology, Pantnagar during 2015-16. Twenty five species of insect pests were found to attack the pigeonpea genotypes among which five insect pests attained major pest status viz., Empoasca kerri Pruthi, Grapholitica critica Meyr., Maruca vitrata (Geyer), Clavigralla gibbosa Spinola and Melanagrmyza obtusa (Malloch). Eleven natural enemies were also found associated with the insect pest complex, among which Eocantheocona furcellata (Wolff.) was identified as a potential predator of M. vitrata, G. critica and Spodoptera litura. Incidence of insect pests of pigeonea was studied from 31st SW to 52nd SW. M. vitrata and M. obtusa were found to be dominant pests among the pod borer complex incidence of the predatory bugs was studied from 38th SW to 47th SW maximum population of E. furcellata (5.8 bugs/m2) and R. fuscipes (1.4 bugs/m2) were observed during 42nd SW and 41st SW respectively. Result of screening of thirty one pigeonpea genotypes with three checks against pod borer complex revealed that two genotypes was found to be highly resistant, seven genotypes found highly susceptible, eight genotypes was found moderately susceptible and seventeen genotypes was found least susceptible to M. vitrata damage. In case of H. armigera seven genotypes was found highly susceptible, thirteen genotypes was found to be moderately susceptible and nine genotypes was found to be least susceptible to H. armigera damage. While ten genotypes was found highly susceptible, nine genotypes was found moderately susceptible and twelve genotypes was found least susceptible to M. obtusa damage over the checks cultivars PA 291, PUSA 992 and UPAS 120. Results on morphological characters revealed that the pod length of pigeonpea genotypes varied from 50.71 mm to 61.53 mm, pod width varied from 6.42 mm to 8.37 mm, pod wall thickness varied from 0.33 mm to 0.48 mm, number of grains per pod varied from 3.28 grains to 4.16 grains, number of pod per plant varied from 27.4 pods/plant to 94 pods/plant, trichomes density on pod varied from 257/9mm2 to 324.4/9mm2 and days to flowering varied from 74 days to 78 days. Correlation studies of morphological characters with pod damage per cent revealed that some genotypes having greater pod length, greater width and thicker pod wall suffered less damage, whereas, no significant role of trichomes density on pod, number of pod/plant and number of grains/pod was reported on pod damage of genotypes.ThesisItem Open Access Population dynamics and management of insect pest complex of brinjal (Solanum melongena L.) using neem oil and some newer insecticides(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-06) Patel, Kanhaiya Kumar; Karnatak, A.K.ThesisItem Open Access Chemical analysis of honey, pollen and insecticide residue in honey samples collected from various locations of Uttarakhand and Uttar Pradesh(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-08) Durgapal, Kamal Kumar; Mall, PramodThesisItem Open Access Bioefficacy of some insecticides against Spilosoma obliqua (Wlk.), Spodoptera litura (Fab.) and Coridius janus (Fab.)(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-06) Ravindra Kumar; Srivastava, R.P.ThesisItem Open Access Population dynamics of insect pests of tomato and bioefficacy of imidacloprid (17.1 % w/w SL) against potential pests of tomato crop at Pantnagar(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-06) Rawat, Nistha; Bisht, R.S.ThesisItem Open Access Preliminary studies on seasonal incidence and growth parameters of Helicoverpa armigera (Hubner) on wheat at Pantnagar(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-06) Patel, Chenesh; Tiwari, RuchiraThesisItem Open Access Population dynamics of insect-pests and their predators associated with paddy crop at Pantnagar during 2015(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-07) Arya, Ashutosh Kumar; Singh, C.P.ThesisItem Open Access Studies on insect pests infesting hybrid and open varieties of tomato and development of different modules for their management(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-07) Nautiyal, Anjali; Srivastava, R.M.