Browsing by Author "Singh, Rashmirekha"
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ThesisItem Open Access EFFICACY OF ESSENTIAL OILS OF SOME MEDICINAL PLANTS AGAINST DIAMOND BACK MOTH (Plutellaxylostella L.) ON CABBAGE(Department of Entomology and agricultural Zoology, Institute of agricultural Science, BHU. Varanasi, 2017) Singh, Rashmirekha; singh, Prof. N.NAn experiment was carried out under field conditions at the Vegetable Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi during rabi seasons of 2016-17, to evaluate the bio-efficacy of eight essential oils along with one insecticide against diamondback moth (DBM), Plutellaxylostella (L.) and their impact on cabbage yield. All treatments showed high efficacy in reducing the Diamond back moth population as compared to untreated control. Among the different treatments P. cablin oil was most effective against Diamond back moth which was followed by C. longa oil,O.basilicum var. surbhi oil, Cymbopogoncitratesoil, O. basilicum × O. tenuiflorum oil, Cymbopogon martini oil, Ocimumbasilicum Var. Saumya, Acephate 75 SP and Mentha oil, respectively. The difference in their effectiveness was statistically significant. Whereas, Mentha oil recorded the lowest efficacy compared with rest of treatments but it was also significantly superior over control. The analysis of yield data revealed that the effect of different essential oils was quiet good when compared with untreated control. The effect of Cymbopogon citrates i.e. Citronella oil on cabbage yield was found superior over rest of the treatments.This may be due to effectiveness of C. citrates against other important insect pests of cabbage, whereas the performances of Cymbopogonmartinii oil, Pogostemoncablin oil and O. basilicum var. saumya oil were also very good like the performance of Citronella oil.The yield from rest of treatments was also found statistically superior over the control plots. Yield from untreated plots was very less comparable to the treated plots.ThesisItem Open Access Varietal screening and biorational approaches for management of groundnut bruchid, Caryedon serratus Olivier during storage(Department of Entomology, OUAT, Bhubaneswar, 2022-12-27) Singh, Rashmirekha; Mishra, P.R.Groundnut bruchid, Caryedon serratus Olivier is a primary pest of stored groundnut which causes both quantitative and qualitative loss to groundnut inflicting damage up to 70 and 80 per cent in pods and kernels, respectively (Sreedhar et al., 2020). Laboratory studies on “Varietal screening and biorational approaches for management of groundnut bruchid, Caryedon serratus Olivier during storage” were conducted in Department of Entomology, Department of Seed Science & Technology, Department of Plant Physiology and Department of Animal nutrition, OUAT, Bhubaneswar during 2018 to 2020. Bio-ecological aspects of C. serratus were studied at different temperature (20, 25, 30 and 350C) and relative humidity combinations (60, 70 and 80 per cent) on the cultivar Devi with factorial completely randomized design. The effect of temperature and relative humidity on developmental period and survival of the test insect revealed that increasing temperature and humidity encouraged the growth and development of the insect. Lower temperature coupled with lower humidity proved unpropitious for the development. However, optimum combination of 30°C and 70 per cent RH was most conducive to growth and development attributing to the highest survival percentage. The temperature and RH had a significant effect on the growth and development of C. serratus. Twenty groundnut varieties were assessed for their relative resistance/susceptibility against the groundnut bruchid, based on the biological attributes of the pest on the variety following the method stated by Mensah, (1986). Index of susceptibility (IS) was taken as the criteria for assessing the resistance or susceptibility and the varieties were classified into five categories viz., resistant (0-2.5), moderately resistant (2.6-5.0), moderately susceptible (5.1- 7.5), susceptible (7.6-10) and highly susceptible (>10). Groundnut pods of 5 varieties viz., ICGV-00351, ICGV-02266, ICGV-15423, ICGV-15412, ICGV-15398 were classified as moderately resistant while ICGV-15400 was highly susceptible to pest attack. The biophysical parameters like shell thickness and hardness contributed to resistance, while inter granular space, pod size and weight provided susceptibility. Biochemical traits such as protein content had a positive effect on the biology of C. serratus whereas phenol, fibre and ash contents exerted a negative effect. Biorational management of C. serratus through elevated levels of CO2, nano particles (nano silica and nano zinc), essential oils, desiccant beads and inert materials were studied. Elevated levels of CO2 at 60-80 per cent for 180 minutes resulted in cent per cent mortality of the bruchid within 1 to 2 days of treatment. Among the nano particles, nano silica and nano zinc applied @1000 ppm and 750 ppm caused the highest mortality of the bruchid. Desiccant beads viz., zeolite and sodium aluminum silicate impregnated with groundnut pods in the ratio of 1:1 proved effective in suppression of the bruchid. Essential oils of citronella and neem @10 ml/kg of pods proved superior over other treatments. Among the inert materials, diatomaceous earth @ 2g/kg of pods provided satisfactory result with highest mortality.