Browsing by Author "Sharma, Kamal Ravi"

Now showing 1 - 8 of 8
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    A review on phytotoxicity and defense mechanism of silver nanoparticles (AgNPs) on plants
    (Springer Science and Business Media B.V., 2023) Kumar, Sumit; Masurkar, Prahlad; Sravani, Bana; Bag, Dipanjali; Sharma, Kamal Ravi; Singh, Prashant; Korra, Tulasi; Meena, Mukesh; Swapnil, Prashant; Rajput, Vishnu D.; Minkina, Tatiana
    Silver nanoparticles (AgNPs) are noteworthy used nanomaterials in a wide array of fields, particularly in the agricultural sector. Plants play a multifarious role in the ecosystem and provide a source of food for mankind. The responsibility of the scientific community is to recognize the deleterious impact of AgNPs (1�100�nm in size) on critical crop growth and development of plants, which is required for the assessment of environmental threats to plant, human, and animal health. The continued use of AgNPs in agriculture areas may have negative effects on plant biochemical and physiological responses. The current context focused mainly on AgNPs uptake, transport, and accumulation on crop plants and summarizes different levels of phytotoxicity of AgNPs on plant functions and focused on mechanisms of phytotoxicity employed by AgNPs. Moreover, some tolerance mechanisms and various survival strategies developed by plants under AgNPs toxicity are discussed. This background provides comprehensive information necessary to facilitate profound understanding of the toxic impacts of AgNPs on crop plants. � 2023, The Author(s), under exclusive licence to Springer Nature B.V.
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    EFFECT OF CROP GROWTH STAGES ON THE FIELD POPULATION OF RICE HOPPERS
    (The Entomological Society of India, 2023) Sharma, Kamal Ravi; Raju, S.V.S.; Singh, Kuldeep; Babu, S. Ramesh
    The rice hoppers viz., brown plant hopper (BPH) Nilaparvata lugens (Stal), white-backed planthopper (WBPH) Sogatella furcifera (Horvath) and green leafhopper (GLH) Nephotettix virescens Distant cause loss in rice and the damage is influenced by plant growth stages. Field experiment has been conducted in this study to evaluate the effect of the growing stages on the incidence of these hoppers at the Agricultural Research Farm, Banaras Hindu University, Varanasi, Uttar Pradesh, India during kharif 2018 and 2019. The results revealed that the incidence is significantly varying among the growth stages, and positively correlated (p < 0.05). Nilaparvata lugens and S. furcifera are the most abundant during the maximum tillering to booting stage. In contrast that of N. virescens peaked during the booting to flowering stage. � 2023, The Entomological Society of India. All rights reserved.
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    Effect of environmental factors on the population dynamics of major sucking pests of brinjal
    (Malhotra Publishing House, 2023) Kumar, Naveen; Kumar, Rajnish; Kumar, Lavlesh; Lal, Kishan; Sharma, Kamal Ravi
    Incidence of whitefly started during 34th SMW, while initial jassid and hadda beetle infestation was observed during 35th SMW. However, peak population of whitefly was observed during 41st SMW, whereas, jassid and hadda beetle population reached its peak level on 42nd and 43rd SMW, respectively. The correlation analysis showed that the whitefly population has significantly positive correlation with maximum temperature. Further, negative significant correlation showed with morning RH, evening RH and rainfall with whitefly population. Correlation analysis of certain abiotic factors with jassid and hadda beetle revealed that the population also showed positive correlation with temperature but negative correlation was found with relative humidity and rainfall. � 2023, Journal of Entomological Research. All Rights Reserved.
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    Field efficacy of novel insecticides emamectin benzoate and spinosad against fruit borer, Helicoverpa armigera (H�bner) on tomato
    (Malhotra Publishing House, 2022) Singh, Kuldeep; Raju, S.V.S.; Sharma, Kamal Ravi
    Emamectin Benzoate 5 EC @ 15 g a.i./ha was effective in reducing the infestation of fruit borer and increased the yield of healthy fruits by 38.94 and 39.99% and minimized the yield loss by 42.23 and 42.43% over untreated control during 2017-18 and 2018-19, respectively. Spinosad 45 SC formulation was also effective @ 75 g a.i./ha in protecting the crop and increased the yield of healthy fruits by 34.50 and 36.16% and minimized the yield loss by 35.57 and 36.26% during both the years, respectively. � 2022. All Rights Reserved.
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    Host Preference and Damage Assessment of Pulse Beetle, Callosobruchus maculatus (Fabricius) (Chrysomelidae: Coleoptera) on Different Hosts
    (Agricultural Research Communication Centre, 2021) Ramesh Babu, S.; Raju, S.V.S.; Singh, P.S.; Sharma, Kamal Ravi
    The host preference of pulse beetle, C. maculatus to selected host grains were evaluated under laboratory conditions in the Department of Entomology and Agricultural Zoology, Banaras Hindu University during the year 2018. Cowpea and green gram were most preferred hosts for C. maculatus in terms of oviposition, per cent survival and mean developmental periods. Red gram and soybean were comparatively less preferred host for oviposition (66.38 eggs/50 seeds and 69.00 eggs/50 seeds respectively) than other host grains. In terms of per cent grain damage (92.25%; 90.19%) and per cent weight loss of grains (76.27%; 75.92%) cowpea and green gram were most preferable hosts respectively after 120 days after insect inoculation. � 2021, Agricultural Research Communication Centre. All rights reserved.
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    Incidence of fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) on finger millet and sorghum in Karnataka, India
    (Malhotra Publishing House, 2022) Vinay, N.; Raju, S.V.S.; Srinivasa, N.; Sharma, Kamal Ravi
    During the survey, the fall armyworm infestation was noticed on finger millet and sorghum in two villages of Tumkur district of Karnataka, India. The pest was identified based on both morphological characters of larva and the damage symptoms in the field by available literatures. The survey revealed the incidence of 19.52 - 25.20% on finger millet and 27.32 - 30.67% on sorghum at both the locations. Present report records first incidence of fall armyworm on finger millet in Karnataka. � MPH J. ent. Res.
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    Population dynamics of insect pests in rice ecosystem
    (The Entomological Society of India, 2021) Raju, S.V.S.; Sharma, Kamal Ravi; Ramesh Babu, S.; Mohanta, Pankaj Kumar
    Investigations on major insect pests in rice was carried out at the Agricultural Research Farm, Banaras Hindu University, Varanasi during kharif 2017-18 and 2018-19. Observations on Scirpophaga incertulas incidence revealed that deadhearts and white ears were observed to be maximum during 1st week of October (40thSMW) and 3rd week of November (47th SMW), respectively. Likewise, Cnaphalocrocis medinalis was observed during 1st week of August (31st SMW) with maximum incidence being in the 1st week of October (40th SMW) with 11.39% damaged leaves/ 10 hills. Nilapravata lugens appeared from 2nd week of August (33rd SMW) and attained its peak in 1st week of October (40th SMW) as 17.33/ 10 hills. The maximum incidence of Nephotettix virescens was observed in the 4th week of October (43rd SMW)-15.67 insects/ 10 hills. The activity of Leptocorisa acuta commenced from 3rd week of October (42nd SMW) and reached its peak during 3rd week of November (47th SMW-14.67/ 10 sweeps in nets). Correlation analysis revealed that the rainfall and evening RH exhibited a negative impact on S. incertulas, C. medinalis, N. lugens, N. virescens and L. acuta; minimum and maximum temperature, and morning RH, showed both positive and a negative impact on these insect pests of rice. � 2021, The Entomological Society of India. All rights reserved.
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    Weather based prediction model for green leafhopper (GLH), Nephotettix virescens distant of rice in middle gangetic plains
    (Malhotra Publishing House, 2021) Sharma, Kamal Ravi; Raju, S.V.S.; Meena, R.S.; Babu, S. Ramesh; Singla, Saurav
    The GLH Nephotettix virescens Distant occurrence began to increase during the 33rd SMW (3.0 GLH/15 sweeps) and peaked during the 40th SMW (19 GLH/15 sweeps). The GLH sweep net catches revealed maximum and significant positive correlation with sun shine hours of current week, and showed a significant negative correlation with evening relative humidity and wind speed of 2-lag week and current week. On the other hand, GLH catches revealed a positive correlation with maximum temperature and morning relative humidity of current, 1-lag as well as 2-lag week. Minimum temperature and rainfall of current, 1-lag, 2-lag week and current, 1-lag week, respectively, were negatively correlated with GLH catches. Tmax, Tmin, and SSH were found to be the most significant weather influences that affected GLH sweep net catches. With pest and weather data obtained during Kharif 2019, the model was validated (R2 = 0.92, RSME = 0.218, and MAE = 0.303). � 2021. MPH J. ent. All Rights Reserved.