International Journal of Environment and Climate Change
A screening trial with 10 castor genotypes to assess their relative reaction to leafhoppers (Empo... more A screening trial with 10 castor genotypes to assess their relative reaction to leafhoppers (Empoasca flavescens) was conducted at CCSHAU, Regional Research Station, Bawal during the Kharif season, 2019-20. Among the 10 genotypes, leafhopper population varied from 2.3 to 8.3. Based on leafhopper population and hopper burn score, the triple bloom genotypes Maharaja-9 and GCH-7 were found tolerant to leafhopper whereas the single bloom genotype DCH-177 was highly susceptible. The phenols content in the castor leaves had a significant negative correlation with leafhopper population and hopper burn score while total carbohydrates present in the leaves had a significant positive correlation with leafhopper population and hopper burn score. The intensity of bloom and phenols and carbohydrates content were found to play a major role in the infestation of castor leafhopper.
A screening trial with 10 castor genotypes to assess their relative reaction to leafhoppers (Empo... more A screening trial with 10 castor genotypes to assess their relative reaction to leafhoppers (Empoasca flavescens) was conducted at CCSHAU, Regional Research Station, Bawal during the Kharif season, 2019-20. Among the 10 genotypes, leafhopper population varied from 2.3 to 8.3. Based on leafhopper population and hopper burn score, the triple bloom genotypes Maharaja-9 and GCH-7 were found tolerant to leafhopper whereas the single bloom genotype DCH-177 was highly susceptible. The phenols content in the castor leaves had a significant negative correlation with leafhopper population and hopper burn score while total carbohydrates present in the leaves had a significant positive correlation with leafhopper population and hopper burn score. The intensity of bloom and phenols and carbohydrates content were found to play a major role in the infestation of castor leafhopper.
This study was conducted to determine the impact of environmental conditions on whitefly populati... more This study was conducted to determine the impact of environmental conditions on whitefly population development and OYVMV progression. The increase in the whitefly population began in July and peaked in the first week of October due to favourable climatic circumstances, with maximum temperatures of 34 ± 2°C and minimum temperatures of 23 ± 2°C, morning relative humidity of more than 90%, wind speed of about 3 km/h, more sunshine hours, and no rain. Pusa Sawani (6.54) had the highest average whitefly population, followed by Pusa A4 (5.27) and Varsha Uphar (3.78). During the first week of October, the terminal PDI was highest in Pusa Sawani (73.00%) and lowest in Varsha Uphar (18.75%). In all three cultivars, whitefly population and PDI had a positive relationship with bright daylight hours and morning relative humidity. The highest temperature was positively correlated with the whitefly population and adversely correlated with PDI. However, whitefly population and OYVMV disease were negatively correlated with evening relative humidity, wind speed, and rainfall.
In a field experiment to evaluate the bioefficacy of different pesticides against castor leafhopp... more In a field experiment to evaluate the bioefficacy of different pesticides against castor leafhopper out dimethoate 30 EC showed 84.73% reduction in leafhopper population and was found most effective by giving yield of 40.50 q/ha followed by malathion 50 EC with 71.96% reduction in the leaf hopper population and 39.25 q/ha yield. Among the bio-pesticides, nimbecidine 1500 ppm proved most effective with a mean leafhopper population of 12.33 leafhopper/three leaves with a yield of 34.25 q/ha. Nimbecidine 300 ppm was the second best effective bio-pesticide and gave 35.40% reduction in the leaf hopper population and 32.75 q/ha yield.
Among different treatments, Malathion 50 EC (1 ml/l) in addition with jaggery (3 g/l) was highly ... more Among different treatments, Malathion 50 EC (1 ml/l) in addition with jaggery (3 g/l) was highly efficient with highest fruit yield (233.42 q/ha) and minimum fruit infestation after two sprays (19.53%). Nimbecidine and NSKE (10%) were statistically at par and observed as the second best effective treatments with fruit infestation of 27.41 and 27.79%, respectively. NSKE (5%), Beauveria bassiana and Metarhizum anisopliae were also effective to certain extent with 50.59, 47.31 and 41.85% reduction in fruit infestation over control, respectively. Cow urine treatment was least effective treatment but had significantly lower per cent of fruit infestation (39.86%) as compared to control (54.29%).
International Journal of Environment and Climate Change
A screening trial with 10 castor genotypes to assess their relative reaction to leafhoppers (Empo... more A screening trial with 10 castor genotypes to assess their relative reaction to leafhoppers (Empoasca flavescens) was conducted at CCSHAU, Regional Research Station, Bawal during the Kharif season, 2019-20. Among the 10 genotypes, leafhopper population varied from 2.3 to 8.3. Based on leafhopper population and hopper burn score, the triple bloom genotypes Maharaja-9 and GCH-7 were found tolerant to leafhopper whereas the single bloom genotype DCH-177 was highly susceptible. The phenols content in the castor leaves had a significant negative correlation with leafhopper population and hopper burn score while total carbohydrates present in the leaves had a significant positive correlation with leafhopper population and hopper burn score. The intensity of bloom and phenols and carbohydrates content were found to play a major role in the infestation of castor leafhopper.
A screening trial with 10 castor genotypes to assess their relative reaction to leafhoppers (Empo... more A screening trial with 10 castor genotypes to assess their relative reaction to leafhoppers (Empoasca flavescens) was conducted at CCSHAU, Regional Research Station, Bawal during the Kharif season, 2019-20. Among the 10 genotypes, leafhopper population varied from 2.3 to 8.3. Based on leafhopper population and hopper burn score, the triple bloom genotypes Maharaja-9 and GCH-7 were found tolerant to leafhopper whereas the single bloom genotype DCH-177 was highly susceptible. The phenols content in the castor leaves had a significant negative correlation with leafhopper population and hopper burn score while total carbohydrates present in the leaves had a significant positive correlation with leafhopper population and hopper burn score. The intensity of bloom and phenols and carbohydrates content were found to play a major role in the infestation of castor leafhopper.
This study was conducted to determine the impact of environmental conditions on whitefly populati... more This study was conducted to determine the impact of environmental conditions on whitefly population development and OYVMV progression. The increase in the whitefly population began in July and peaked in the first week of October due to favourable climatic circumstances, with maximum temperatures of 34 ± 2°C and minimum temperatures of 23 ± 2°C, morning relative humidity of more than 90%, wind speed of about 3 km/h, more sunshine hours, and no rain. Pusa Sawani (6.54) had the highest average whitefly population, followed by Pusa A4 (5.27) and Varsha Uphar (3.78). During the first week of October, the terminal PDI was highest in Pusa Sawani (73.00%) and lowest in Varsha Uphar (18.75%). In all three cultivars, whitefly population and PDI had a positive relationship with bright daylight hours and morning relative humidity. The highest temperature was positively correlated with the whitefly population and adversely correlated with PDI. However, whitefly population and OYVMV disease were negatively correlated with evening relative humidity, wind speed, and rainfall.
In a field experiment to evaluate the bioefficacy of different pesticides against castor leafhopp... more In a field experiment to evaluate the bioefficacy of different pesticides against castor leafhopper out dimethoate 30 EC showed 84.73% reduction in leafhopper population and was found most effective by giving yield of 40.50 q/ha followed by malathion 50 EC with 71.96% reduction in the leaf hopper population and 39.25 q/ha yield. Among the bio-pesticides, nimbecidine 1500 ppm proved most effective with a mean leafhopper population of 12.33 leafhopper/three leaves with a yield of 34.25 q/ha. Nimbecidine 300 ppm was the second best effective bio-pesticide and gave 35.40% reduction in the leaf hopper population and 32.75 q/ha yield.
Among different treatments, Malathion 50 EC (1 ml/l) in addition with jaggery (3 g/l) was highly ... more Among different treatments, Malathion 50 EC (1 ml/l) in addition with jaggery (3 g/l) was highly efficient with highest fruit yield (233.42 q/ha) and minimum fruit infestation after two sprays (19.53%). Nimbecidine and NSKE (10%) were statistically at par and observed as the second best effective treatments with fruit infestation of 27.41 and 27.79%, respectively. NSKE (5%), Beauveria bassiana and Metarhizum anisopliae were also effective to certain extent with 50.59, 47.31 and 41.85% reduction in fruit infestation over control, respectively. Cow urine treatment was least effective treatment but had significantly lower per cent of fruit infestation (39.86%) as compared to control (54.29%).
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Papers by Jai Parkash