Browsing by Author "Suman Devi"
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ThesisItem Open Access Diversity, abundance and pollination efficiency of insect pollinators on seed crop of broccoli (Brassica oleracea L. var. italica Plenck)(CCSHAU, 2014) Suman Devi; OmbirThe present study was conducted at Chaudhary Charan Singh Haryana Agricultural University, Hisar, Haryana (India). Twenty seven insect species belonging to 14 families under 5 orders were observed visiting the flowers of broccoli. In variety BFT-1, A. dorsata was the most abundant visitor (2.90) followed by A. mellifera (2.30), A. cerana (1.20), A. florea (0.80) and syrphid fly were least frequent visitor (0.20), in variety GH-1 A. mellifera was the most abundant visitor (7.34) followed by A. florea (6.67), A. dorsata (2.15), syrphid fly (1.84) and A. cerana (1.22) and in varieties LPH-1 and DPH-1, A. mellifera was the most abundant visitor (5.96 and 7.00) followed by A. florea (4.46 and 5.50), syrphid fly (2.97 and 3.30), A. dorsata (2.62 and 2.41 ) and A. cerana (1.66 and 2.40). The mean foraging speed, in varieties BFT-1, GH-1, LPH-1 and DPH-1 was maximum in case of A. florea (28.29, 38.54, 37.44 and 36.72, respectively) followed by A. dorsata (5.19, 5.24, 5.24 and 5.20, respectively), A. mellifera (4.54, 4.54, 4.52 and 4.50, respectively ), A. cerana (3.56, 3.51, 3.58 and 3.59, respectively) and syrphid fly (1.90, 2.65, 2.67 and 2.60, respectively). The mean foraging rate in varieties BFT-1, GH-1, LPH-1 and DPH-1 was maximum in case of syrphid fly (14.18, 17.61, 17.42 and 17.33, respectively) followed by A. cerana (10.26, 10.29, 10.27 and 10.32, respectively), A. mellifera (9.27, 10.04, 10.00 and 10.31, respectively), A. dorsata (7.84, 7.88, 7.77 and 7.80, respectively) and A. florea (1.42, 1.71, 1.71 and 1.72, respectively). The average number of broccoli siliqua/plant, siliqua length, number of seeds/siliqua, seed vigour-I, seed vigour-II, test weight and germination per cent under open-pollination were significantly higher than without insect pollination. Number of siliqua/plant, number of seeds/10 siliqua, siliqua length (cm), test weight (g), germination (%) and seed vigour-I, seed vigour-II of uncaged and caged broccoli plants were 3,362.0 and 672.6, 118.75 and 25.85, 6.79 and 3.54, 2.888 and 2.092, 87.50 and 30.25, 1,471.65 and 418.40 and 0.662 and 0.112, respectively.ThesisItem Open Access Effect of different management practices against major insect pests of cotton(CCSHAU, 2018) Suman Devi; Pala RamThe present study was conducted at Chaudhary Charan Singh Haryana Agricultural University, Hisar, Haryana (India). Effect of different management practices such as sowing time, intercropping, evaluation of ecofriendly practices such as use of neem-based insecticides, release of Trichogramma chilonis Ishii etc. were studied against major insect-pests of cotton during 2016 and 2017. In both the varieties, HD-432 (desi) and H-1098i (American), the population of sucking insect pests namely, Amrasca biguttula biguttula Ishida, Thrips tabaci Linderman and Bemisia tabaci Gennadius and incidence of bollworms namely, Earias species, Helicoverpa armigera Hubner and Pectinophora gossypiella Saunders was high in late sown cotton as compared to early sown cotton. During 2016 and 2017, the minimum incidence of bollworms (Earias species and H. armigera, combined) in green fruiting bodies was recorded in treatment T2 (spinosad 45 SC) (10.09% and 8.10%, respectively) which was at par with T3 (spinosad 45 SC alternated with nimbecidine 0.03 % azadirachtin) (10.13% and 9.14%, respectively), T1 (nimbecidine 0.03 % azadirachtin) (12.24% and 10.85%, respectively) and T6 (cotton-sesame intercropping +release of T. chilonis adults alternated with nimbecidine0.03 % azadirachtin) (10.14% and 8.81%, respectively). During 2016 and 2017, on green bolls basis, minimum incidence of P. Gossypiella was recorded in T2 (spinosad 45 SC) (2.67% and 2.00%, respectively) and it was at par with T3 (spinosad 45 SC alternated with nimbecidine 0.03 % azadirachtin) (3.11% and 2.55%, respectively) and T6 (intercropping cotton-sesame+release of T. chilonis adults alternated with nimbecidine 0.03 % azadirachtin) (2.89% and 2.53%, respectively). Intercropping cotton with different crops was found to have significant effect in reducing the population/incidence of major insect pests in cotton crop. The lowest population of sucking insect pests was found in cotton intercropped with bajra and sorghum as border crop and highest was in sole cotton. Lowest incidence of bollworms was found in cotton intercropped with sesame and highest in sole cotton. Intercropping cotton with crops like sesame, pigeonpea, sorghum and bajra enhanced the population of natural enemies in cotton crop. The results of the present study may be useful in managing insect pests in cotton based organic farming systems.ThesisItem Open Access Genetic variability and diversity for morphological and seed vigour parameters in barley (Hordeum vulgare L.)(CCSHAU, 2018) Suman Devi; Yogender KumarThe objectives of present investigation were to determine the magnitude of variability, character association and to study the genetic divergence for various morphological and seed vigour parameters in 50 genotypes of barley under timely and late sown conditions. Significant variability was observed among genotypes for all the traits studied under both the environments. The genotypes IBYT-HI-15, AZAD, BH 959, IBYT-HI- 19, BH 14-42 and BH 14-25 showed significantly higher grain yield than general mean under timely sown condition and under late sown condition, the genotypes namely IBYT-HI-15, RD 2904, BH 902, IBYT-HI-13, HUB 242, IBYT-HI-17, DWR 137, K 560 and DWRB 101 have been found promising. Genotypic correlation estimates under timely sown condition showed significant positive association of grain yield per plot with harvest index, biological yield, germination per cent, 1000 grain weight, accelerated ageing (48 h, 72 h) and days to maturity, similarly under late sown conditions, positive and significant correlation of grain yield was recorded with harvest index, biological yield, 1000 grain weight, vigour index-I, seedling dry weight and number of tillers per meter. The path coefficient analysis revealed that biological yield per plot, harvest index, seedling length and vigour index-II exerted highest positive direct effects on grain yield per plot under both environments. The Euclidean cluster analysis assigned all the genotypes into eight distinct clusters each under both the conditions. The improvement in barley could be achieved through the use genotypes assigned in clusters I and VII under timely sown, whereas the genotypes which contained in cluster II and VI might be considered as potential parents under late sown to obtain high heterotic response and consequently better segregants for grain yield.ThesisItem Open Access Influence of post-harvest treatments on shelf-life and quality of litchi (Litchi chinensis Sonn.)(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2009-09) Suman Devi; Chopra, C.S.