Anjumoni Devee - Academia.edu (original) (raw)
Papers by Anjumoni Devee
Research Biotica, Sep 28, 2023
Tomatoes rank second among the most significant vegetables farmed worldwide for their high nutrit... more Tomatoes rank second among the most significant vegetables farmed worldwide for their high nutritional content and widespread consumption. The cultivated tomato (Lycopersicon esculentum Mill.) is a genetically enhanced species that is a member of the genus Solanum belonging to the nightshade family (Solanaceae). It can be grown outdoors, in greenhouses, or in net houses all over the globe.
International Journal of Enviornment and Climate Change, Aug 25, 2023
Wheat is widely used as a staple food in the world including India. But storage conditions of whe... more Wheat is widely used as a staple food in the world including India. But storage conditions of wheat grains are infected by several coleopteran pests. Tribolium castaneum Herbst is a ubiquitous and pestiferous pest among all. Adult and larvae both are harmful to wheat storage which often demolishes stored grains. The present study attempted at Entomology laboratory, Assam Agricultural University-Jorhat, to manage Dry powders of A. indica, C. roseus, C. heptaphylla, D. stramonium, E. tereticornis, M. struthiopteris, and V. negundo were used against T. castaneum to get rid of problematic local medicinal plants. During probit analysis the highest LD 50 value was found in A. indica (1.49%) followed by D. stramonium (1.52%) and E. tereticornis (2.02%) and the lowest LD 50 in Matteuccia struthiopteris (11.72%). In the repellency test, the highest rate of repellency was observed in A. indica (82.21%) followed by D. stramonium (72.59%), E. tereticornis (70.36%), and the lowest in Matteuccia struthiopteris (32.58%). Based on LD 50 and mean repellency, the three botanicals (A. indica, D. stramonium, E. tereticornis) were selected for further work e.g., mortality and weight loss. A mortality study recorded 100% mortality after 35 days of Original Research Article
Journal of Entomological Research
Zenodo (CERN European Organization for Nuclear Research), Feb 10, 2023
International Journal of Current Microbiology and Applied Sciences, 2021
Okra (Abelmoschus esculentus L. Moench) is an important commercial crop in India which plays a ke... more Okra (Abelmoschus esculentus L. Moench) is an important commercial crop in India which plays a key role in national economy. India is the biggest producer of okra ranked first in the world (72.9% of the total world production) with 0.53 million ha area, 6.35 million tones production and a productivity of 11.96 t/ha (Anonymous, 2017a). In Assam, the crop is grown in an area of 12.11 thousand ha with an annual production of 191.70 thousand metric tonnes (Anonymous, 2017b). The state is contributing approximately 3.15 per cent of the total production of okra in the country, which is very low compare to other leading states. Despite large area and quite a good number of cultivars, the supply of okra in Indian market is not matching to its demand. The productivity of okra is low due to many factors and one of the most important constraint in production is the attack of insect pests. Okra is attacked by a number of insect pests, which are the major problems in getting higher yields (Kumar...
The Asian Journal of Horticulture, 2013
International journal of tropical agriculture, 2018
Research & Reviews: Journal of Agricultural Science and Technology, Jan 29, 2021
Indian Journal of Entomology
Leucinodes orbonalis Guenée (Lepidoptera: Crambidae) is a serious pest of brinjal. During the fie... more Leucinodes orbonalis Guenée (Lepidoptera: Crambidae) is a serious pest of brinjal. During the field observations, a solitary larval parasitoid of L. orbonalis viz., Trathala flavoorbitalis (Cameron) (Hymenoptera: Ichneumonidae) was osberved. The present study reports larval parasitism of L. orbonalis with 6% field parasitism by T. flavoorbitalis in Manipur.
Relative toxicity of insecticides viz., clothianidin, bifenthrin, imidacloprid, spinosad, thiaclo... more Relative toxicity of insecticides viz., clothianidin, bifenthrin, imidacloprid, spinosad, thiacloprid, flubendiamide, flonicamid and dimethoate is reported against cowpea aphid, Aphis craccivora Koch. Clothianidin @100 g a.i ha-1 was the most effective in bringing down the population of aphid at 1, 3, 7 DAS, while at 10 DAS, dimethoate (450 g a.i. ha-1) recorded the lowest incidence of aphid population (4.49 number per plant) with highest per cent reduction (79.19). The highest mean yield of 13.08 q ha-1 was obtained from dimethoate 450 g a.i. ha-1 followed by imidacloprid 20 g a.i. ha-1 (12.25 q ha-1) as compared to the lowest in the untreated plots (9.17 q ha-1). The highest benefit was achieved in the plots treated with imidacloprid 20 g a.i. ha-1 with a benefit-cost ratio of 8.72:1 whereas the lowest benefit cost ratio of 0.37:1 was obtained from the plots treated with spinosad 45 g a.i. ha-1. In laboratory, following dry film bioassay, the LC 50 (at 24 h) of clothianidin, bifenthrin, imidacloprid , spinosad, thiacloprid, flubendiamide, flonicamid and dimethaote were found to be 0.031, 0.117, 0.063, 0.912, 0.042,0.027, 0.079 and 0.057 ppm with the order of toxicity flubendiamide> clothianidin > thiacloprid > dimethoate >imidacloprid >flonicamid> bifenthrin >spinosad, respectively. Taking dimethoate as unity, the order of relative toxicity of insecticides was: flubendiamide (2.11)> clothianidin (1.83)> thiacloprid (1.35) > imidacloprid (0.90)>flonicamid (0.72)> bifenthrin (0.48)>spinosad (0.06) at 24 h. It was concluded that though dimethoate 450 g ai. ha-1 was an equally effective insecticide against A. craccivora as imidacloprid, the latter was more effective in terms of aphid population reduction, yield and benefit-cost ratio. Considering the LC 50 values and relative toxicity against A. craccivora, flubendiamide 60 a.i ha-1 was the most toxic and spinosad 45 a.i ha-1 the least toxic among the tested chemicals.
Journal of Entomological Research, 2021
Different IPM modules untreated control were evaluated against Diamond back moth, Plutella xylos... more Different IPM modules untreated control were evaluated against Diamond back moth, Plutella xylostella , cabbage butterfly, Pieris canidia , cutworm, Agrotis ipsilon and cabbage aphid, Brevicoryne brassicae . Among the modules, Module (M5) i.e. lamda-cyhalothrin @ 25g a.i. per ha contributed maximum effectiveness in reducing the population of various pests followed by Module (M1) consisting of 3 releases of Trichogramma chilonis @ 1 lakh/ha at 10 days interval + 3 releases of T. pieridis @ 1 lakh/ha at 10 days interval + one spray of Bt@ 2ml/lit at 15 days after release of Trichogramma + one spray of NSKE 5%. However, the highest population of coccinellids was achieved in the biopesticide treated plots compared to lamda-cyhalothrin treated plots. The highest marketable yield was recorded in Module (M5) (262.50 and 252.50 q/ha) with a cost benefit ratio of 2.28 and 2.62 which was followed by Module (M1) contributed the yield of 212.78 and 202.67 q/ha as against 114.89 and 96.11 q/h...
Association of Entomological Society , 2016
Different IPM modules untreated control were evaluated against Diamond back moth, Plutella xylost... more Different IPM modules untreated control were evaluated against Diamond back moth, Plutella xylostella, cabbage butterfly, Pieris canidia, cutworm, Agrotis ipsilon and cabbage aphid, Brevicoryne brassicae. Among the modules, Module (M5) i.e. lamda-cyhalothrin @ 25g a.i. per ha contributed maximum effectiveness in reducing the population of various pests followed by Module (M1) consisting of 3 releases of Trichogramma chilonis @ 1 lakh/ha at 10 days interval + 3 releases of T. pieridis @ 1 lakh/ha at 10 days interval + one spray of Bt@ 2ml/lit at 15 days after release of Trichogramma + one spray of NSKE 5%. However, the highest population of coccinellids was achieved in the biopesticide treated plots compared to lamda-cyhalothrin treated plots. The highest marketable yield was recorded in Module (M5) (262.50 and 252.50 q/ha) with a cost benefit ratio of 2.28 and 2.62 which was followed by Module (M1) contributed the yield of 212.78 and 202.67 q/ha as against 114.89 and 96.11 q/ha in the untreated control plots with a cost benefit ratio of 1.79 and 2.03 during 2013-14 and 2014-15, respectively. Though the maximum return was obtained from Module (M5) followed by Module (M1), considering the coccinellids population, it may be concluded that instead of use of chemical alone farmers can adopt the IPM module M1 for effective reduction of pests on cabbage.
Pesticide Research Journal, 2010
Dissipation behaviour of imidacloprid and bifenthrin applied underfield condition on Brassica cam... more Dissipation behaviour of imidacloprid and bifenthrin applied underfield condition on Brassica campestris, rapeseed crops was studied in tender shoots and seeds. The initial deposits of imidacloprid at 20, 40, 60 g a.i ha−1, bifenthrin at 60, 80,100g a.i ha−1and deltamethrin at 15g a.i ha−1 were 0.830,1.126,1.280,0.446, 0.666, 1.448 and 1.478. respectively. Imidacloprid residues reached below its detectable level after 5th and 10th day of its application at lower and higher rates. The half life values were 1.44, 1.96, 1.67, 1.17, 1.36, 1.43 and 1.51 days for imidacloprid at 20, 40, 60 g a.i ha−1, bifenthrin at 60, 80, 100 g a.i ha−1 and deltamethrin at 15 g a.i ha−1, respectively. Based on the observations, a waiting period of at least four days after imidacloprid application at recommended dose (20 g a.i ha−1) is suggested and considered safe from point of health hazards due to toxic effect of residues in leaves.
Pesticide Research Journal, 2010
The relative toxicity of imidacloprid and bifenthrin were evaluated against the 4th instar nymph ... more The relative toxicity of imidacloprid and bifenthrin were evaluated against the 4th instar nymph of Lipaphis erysimi (Kalt.) by working out the probit analysis. Imidacloprid was found to be most effective followed by bifenthrin and deltamethrin. Their LC50 values were 0.00017 and 0.00015 for imidacloprid, 0.00152 and 0.00122 for bifenthrin, 0.00199 and 0.00134 for deltamethrin, after 24 and 48 h of treatment respectively. Imidacloprid was 8.93 times and bifenthrin 1.10 times more toxic than deltamethrin after 48 h of treatment. On the basis of LC50 values the order of toxicity was found to be imidacloprid >bifenthrin >deltamethrin.
Varietal screening of 12 different aromatic rice varieties including check variety pertaining to ... more Varietal screening of 12 different aromatic rice varieties including check variety pertaining to 1% dead heart (DH) and white ear head (WEH) were done at Instructional Cum Research farm, Assam Agricultural University, Jorhat during Kharif 2017 and 2018 under field condition in order to evaluate the resistance/susceptibility reaction against rice stem borer, Scirpophaga innotata Walker. The two year pooled data of stem borer infestation at different intervals (30 and 60 DAT) revealed that no resistant variety was observed against stem borer attack in active tillering stage. However, Kola Joha, Sofguti Joha, Boga Joha, Maniki Joha, Keteki Joha, Ronga Joha and Kon Joha showed Moderately Resistant (MR) reaction during vegetative stage with damage score of “3, while Krishna Joha, Koni Joha, Bokul Joha and Tulsi Bhog Joha showed Moderately Susceptible (MS) reaction and recorded damage score of “5”. Kon Joha and Maniki Joha were considered as Resistant (R) variety at reproductive stage (Sc...
Pesticide Research Journal, 2010
Bifenthrin at three different concentrations viz., 40, 60, 80 g a.i./ha with dimethoate at 450 g ... more Bifenthrin at three different concentrations viz., 40, 60, 80 g a.i./ha with dimethoate at 450 g a.i./ha (standard check) were evaluated against tea mosquito bug, Helopeltis theivora and studied their dissipation pattern in green tea leaves. The initial deposits were estimated as 0.162, 0.263, 0.345 and 1.23 µg g−1 for bifenthrin at 40, 60, 80 g a.i./ha and dimethoate at 450 g a.i./ha respectively. The residues of bifenthrin 40 g (0.025 µg g−1) and 60 g (0.050 µg g−1) could be detectable only up to 3rd day of spraying while residues of bifenthrin 80 g and dimethoate 450 g a.i./ha persisted up to 7th and 15th d of application. The half life of bifenthrin at 40, 60 and 80 g a.i./ha, in tea leaves was 1.17,1.17 and 1.90 d respectively and 3.38 d for dimethoate 450 g a.i./ha. A waiting period of 3 days for bifenthrin and 7 days for dimethoate have been suggested.
Journal of entomology and zoology studies, 2018
The present investigation was conducted to study the diversity of Carabids in Gerbera and Gladiol... more The present investigation was conducted to study the diversity of Carabids in Gerbera and Gladiolus crops of Jorhat, Assam during the year 2014 2015 and 2015 2016. The specimens were identified by following published keys and literature and described on the basis of observed morphological characteristics. Results found a total 8 species of carabids belonging to 4 genera viz., Clivina, Scarites, Harpalus, and Sparostes under 3 tribesClivinini, Scaritini and Harpalini 2 subfamily (Scaritinae and Harpalinae) from the flower crop Gerbera and Gladiolus. Among these 8 species, 3 under genera Clivina viz., C. assamensis, C. memnonia, C. lobata and 2 under Scarites and Harpalus, viz., S. indus, S. inconspicuous, H. rufipes, H. calceatus and one from Sparostes viz., Sparostes striatulus. Among all the species, S. indus, C. assamensis and S. inconspicuous were relatively more abundance with 18.75%, 16.75%, 15%, respectively. The species richness, species diversity and species evenness were co...
International Journal of Tropical Insect Science, 2020
The yellow banded wasp, Vespa cincta F. is one of the most destructive pests of honeybee colonies... more The yellow banded wasp, Vespa cincta F. is one of the most destructive pests of honeybee colonies in India. Despite high species richness, there is diminutive information on the intraspecific variations occurring in the wasp from different geographical regions. The present study was undertaken to ascertain if any intraspecific variability existed in populations of V. cincta from four geographical regions of Assam, India. The adult specimens from each region were studied using 24 morphological characters, as well as with genetic markers subjected to PCR. No significant variation was recorded for 15 morphological characters; however, nine characters viz., body length, thorax length and width, mandible length and width, fore wing width, fore leg width, hind leg width, and sting width were significantly larger in specimens collected from Barak Valley and Hill Zone (BVHZ) as compared to specimens from Upper Brahmaputra Valley Zone (UBVZ), Lower Brahmaputra Valley Zone (LBVZ) and North Ba...
Research Biotica, Sep 28, 2023
Tomatoes rank second among the most significant vegetables farmed worldwide for their high nutrit... more Tomatoes rank second among the most significant vegetables farmed worldwide for their high nutritional content and widespread consumption. The cultivated tomato (Lycopersicon esculentum Mill.) is a genetically enhanced species that is a member of the genus Solanum belonging to the nightshade family (Solanaceae). It can be grown outdoors, in greenhouses, or in net houses all over the globe.
International Journal of Enviornment and Climate Change, Aug 25, 2023
Wheat is widely used as a staple food in the world including India. But storage conditions of whe... more Wheat is widely used as a staple food in the world including India. But storage conditions of wheat grains are infected by several coleopteran pests. Tribolium castaneum Herbst is a ubiquitous and pestiferous pest among all. Adult and larvae both are harmful to wheat storage which often demolishes stored grains. The present study attempted at Entomology laboratory, Assam Agricultural University-Jorhat, to manage Dry powders of A. indica, C. roseus, C. heptaphylla, D. stramonium, E. tereticornis, M. struthiopteris, and V. negundo were used against T. castaneum to get rid of problematic local medicinal plants. During probit analysis the highest LD 50 value was found in A. indica (1.49%) followed by D. stramonium (1.52%) and E. tereticornis (2.02%) and the lowest LD 50 in Matteuccia struthiopteris (11.72%). In the repellency test, the highest rate of repellency was observed in A. indica (82.21%) followed by D. stramonium (72.59%), E. tereticornis (70.36%), and the lowest in Matteuccia struthiopteris (32.58%). Based on LD 50 and mean repellency, the three botanicals (A. indica, D. stramonium, E. tereticornis) were selected for further work e.g., mortality and weight loss. A mortality study recorded 100% mortality after 35 days of Original Research Article
Journal of Entomological Research
Zenodo (CERN European Organization for Nuclear Research), Feb 10, 2023
International Journal of Current Microbiology and Applied Sciences, 2021
Okra (Abelmoschus esculentus L. Moench) is an important commercial crop in India which plays a ke... more Okra (Abelmoschus esculentus L. Moench) is an important commercial crop in India which plays a key role in national economy. India is the biggest producer of okra ranked first in the world (72.9% of the total world production) with 0.53 million ha area, 6.35 million tones production and a productivity of 11.96 t/ha (Anonymous, 2017a). In Assam, the crop is grown in an area of 12.11 thousand ha with an annual production of 191.70 thousand metric tonnes (Anonymous, 2017b). The state is contributing approximately 3.15 per cent of the total production of okra in the country, which is very low compare to other leading states. Despite large area and quite a good number of cultivars, the supply of okra in Indian market is not matching to its demand. The productivity of okra is low due to many factors and one of the most important constraint in production is the attack of insect pests. Okra is attacked by a number of insect pests, which are the major problems in getting higher yields (Kumar...
The Asian Journal of Horticulture, 2013
International journal of tropical agriculture, 2018
Research & Reviews: Journal of Agricultural Science and Technology, Jan 29, 2021
Indian Journal of Entomology
Leucinodes orbonalis Guenée (Lepidoptera: Crambidae) is a serious pest of brinjal. During the fie... more Leucinodes orbonalis Guenée (Lepidoptera: Crambidae) is a serious pest of brinjal. During the field observations, a solitary larval parasitoid of L. orbonalis viz., Trathala flavoorbitalis (Cameron) (Hymenoptera: Ichneumonidae) was osberved. The present study reports larval parasitism of L. orbonalis with 6% field parasitism by T. flavoorbitalis in Manipur.
Relative toxicity of insecticides viz., clothianidin, bifenthrin, imidacloprid, spinosad, thiaclo... more Relative toxicity of insecticides viz., clothianidin, bifenthrin, imidacloprid, spinosad, thiacloprid, flubendiamide, flonicamid and dimethoate is reported against cowpea aphid, Aphis craccivora Koch. Clothianidin @100 g a.i ha-1 was the most effective in bringing down the population of aphid at 1, 3, 7 DAS, while at 10 DAS, dimethoate (450 g a.i. ha-1) recorded the lowest incidence of aphid population (4.49 number per plant) with highest per cent reduction (79.19). The highest mean yield of 13.08 q ha-1 was obtained from dimethoate 450 g a.i. ha-1 followed by imidacloprid 20 g a.i. ha-1 (12.25 q ha-1) as compared to the lowest in the untreated plots (9.17 q ha-1). The highest benefit was achieved in the plots treated with imidacloprid 20 g a.i. ha-1 with a benefit-cost ratio of 8.72:1 whereas the lowest benefit cost ratio of 0.37:1 was obtained from the plots treated with spinosad 45 g a.i. ha-1. In laboratory, following dry film bioassay, the LC 50 (at 24 h) of clothianidin, bifenthrin, imidacloprid , spinosad, thiacloprid, flubendiamide, flonicamid and dimethaote were found to be 0.031, 0.117, 0.063, 0.912, 0.042,0.027, 0.079 and 0.057 ppm with the order of toxicity flubendiamide> clothianidin > thiacloprid > dimethoate >imidacloprid >flonicamid> bifenthrin >spinosad, respectively. Taking dimethoate as unity, the order of relative toxicity of insecticides was: flubendiamide (2.11)> clothianidin (1.83)> thiacloprid (1.35) > imidacloprid (0.90)>flonicamid (0.72)> bifenthrin (0.48)>spinosad (0.06) at 24 h. It was concluded that though dimethoate 450 g ai. ha-1 was an equally effective insecticide against A. craccivora as imidacloprid, the latter was more effective in terms of aphid population reduction, yield and benefit-cost ratio. Considering the LC 50 values and relative toxicity against A. craccivora, flubendiamide 60 a.i ha-1 was the most toxic and spinosad 45 a.i ha-1 the least toxic among the tested chemicals.
Journal of Entomological Research, 2021
Different IPM modules untreated control were evaluated against Diamond back moth, Plutella xylos... more Different IPM modules untreated control were evaluated against Diamond back moth, Plutella xylostella , cabbage butterfly, Pieris canidia , cutworm, Agrotis ipsilon and cabbage aphid, Brevicoryne brassicae . Among the modules, Module (M5) i.e. lamda-cyhalothrin @ 25g a.i. per ha contributed maximum effectiveness in reducing the population of various pests followed by Module (M1) consisting of 3 releases of Trichogramma chilonis @ 1 lakh/ha at 10 days interval + 3 releases of T. pieridis @ 1 lakh/ha at 10 days interval + one spray of Bt@ 2ml/lit at 15 days after release of Trichogramma + one spray of NSKE 5%. However, the highest population of coccinellids was achieved in the biopesticide treated plots compared to lamda-cyhalothrin treated plots. The highest marketable yield was recorded in Module (M5) (262.50 and 252.50 q/ha) with a cost benefit ratio of 2.28 and 2.62 which was followed by Module (M1) contributed the yield of 212.78 and 202.67 q/ha as against 114.89 and 96.11 q/h...
Association of Entomological Society , 2016
Different IPM modules untreated control were evaluated against Diamond back moth, Plutella xylost... more Different IPM modules untreated control were evaluated against Diamond back moth, Plutella xylostella, cabbage butterfly, Pieris canidia, cutworm, Agrotis ipsilon and cabbage aphid, Brevicoryne brassicae. Among the modules, Module (M5) i.e. lamda-cyhalothrin @ 25g a.i. per ha contributed maximum effectiveness in reducing the population of various pests followed by Module (M1) consisting of 3 releases of Trichogramma chilonis @ 1 lakh/ha at 10 days interval + 3 releases of T. pieridis @ 1 lakh/ha at 10 days interval + one spray of Bt@ 2ml/lit at 15 days after release of Trichogramma + one spray of NSKE 5%. However, the highest population of coccinellids was achieved in the biopesticide treated plots compared to lamda-cyhalothrin treated plots. The highest marketable yield was recorded in Module (M5) (262.50 and 252.50 q/ha) with a cost benefit ratio of 2.28 and 2.62 which was followed by Module (M1) contributed the yield of 212.78 and 202.67 q/ha as against 114.89 and 96.11 q/ha in the untreated control plots with a cost benefit ratio of 1.79 and 2.03 during 2013-14 and 2014-15, respectively. Though the maximum return was obtained from Module (M5) followed by Module (M1), considering the coccinellids population, it may be concluded that instead of use of chemical alone farmers can adopt the IPM module M1 for effective reduction of pests on cabbage.
Pesticide Research Journal, 2010
Dissipation behaviour of imidacloprid and bifenthrin applied underfield condition on Brassica cam... more Dissipation behaviour of imidacloprid and bifenthrin applied underfield condition on Brassica campestris, rapeseed crops was studied in tender shoots and seeds. The initial deposits of imidacloprid at 20, 40, 60 g a.i ha−1, bifenthrin at 60, 80,100g a.i ha−1and deltamethrin at 15g a.i ha−1 were 0.830,1.126,1.280,0.446, 0.666, 1.448 and 1.478. respectively. Imidacloprid residues reached below its detectable level after 5th and 10th day of its application at lower and higher rates. The half life values were 1.44, 1.96, 1.67, 1.17, 1.36, 1.43 and 1.51 days for imidacloprid at 20, 40, 60 g a.i ha−1, bifenthrin at 60, 80, 100 g a.i ha−1 and deltamethrin at 15 g a.i ha−1, respectively. Based on the observations, a waiting period of at least four days after imidacloprid application at recommended dose (20 g a.i ha−1) is suggested and considered safe from point of health hazards due to toxic effect of residues in leaves.
Pesticide Research Journal, 2010
The relative toxicity of imidacloprid and bifenthrin were evaluated against the 4th instar nymph ... more The relative toxicity of imidacloprid and bifenthrin were evaluated against the 4th instar nymph of Lipaphis erysimi (Kalt.) by working out the probit analysis. Imidacloprid was found to be most effective followed by bifenthrin and deltamethrin. Their LC50 values were 0.00017 and 0.00015 for imidacloprid, 0.00152 and 0.00122 for bifenthrin, 0.00199 and 0.00134 for deltamethrin, after 24 and 48 h of treatment respectively. Imidacloprid was 8.93 times and bifenthrin 1.10 times more toxic than deltamethrin after 48 h of treatment. On the basis of LC50 values the order of toxicity was found to be imidacloprid >bifenthrin >deltamethrin.
Varietal screening of 12 different aromatic rice varieties including check variety pertaining to ... more Varietal screening of 12 different aromatic rice varieties including check variety pertaining to 1% dead heart (DH) and white ear head (WEH) were done at Instructional Cum Research farm, Assam Agricultural University, Jorhat during Kharif 2017 and 2018 under field condition in order to evaluate the resistance/susceptibility reaction against rice stem borer, Scirpophaga innotata Walker. The two year pooled data of stem borer infestation at different intervals (30 and 60 DAT) revealed that no resistant variety was observed against stem borer attack in active tillering stage. However, Kola Joha, Sofguti Joha, Boga Joha, Maniki Joha, Keteki Joha, Ronga Joha and Kon Joha showed Moderately Resistant (MR) reaction during vegetative stage with damage score of “3, while Krishna Joha, Koni Joha, Bokul Joha and Tulsi Bhog Joha showed Moderately Susceptible (MS) reaction and recorded damage score of “5”. Kon Joha and Maniki Joha were considered as Resistant (R) variety at reproductive stage (Sc...
Pesticide Research Journal, 2010
Bifenthrin at three different concentrations viz., 40, 60, 80 g a.i./ha with dimethoate at 450 g ... more Bifenthrin at three different concentrations viz., 40, 60, 80 g a.i./ha with dimethoate at 450 g a.i./ha (standard check) were evaluated against tea mosquito bug, Helopeltis theivora and studied their dissipation pattern in green tea leaves. The initial deposits were estimated as 0.162, 0.263, 0.345 and 1.23 µg g−1 for bifenthrin at 40, 60, 80 g a.i./ha and dimethoate at 450 g a.i./ha respectively. The residues of bifenthrin 40 g (0.025 µg g−1) and 60 g (0.050 µg g−1) could be detectable only up to 3rd day of spraying while residues of bifenthrin 80 g and dimethoate 450 g a.i./ha persisted up to 7th and 15th d of application. The half life of bifenthrin at 40, 60 and 80 g a.i./ha, in tea leaves was 1.17,1.17 and 1.90 d respectively and 3.38 d for dimethoate 450 g a.i./ha. A waiting period of 3 days for bifenthrin and 7 days for dimethoate have been suggested.
Journal of entomology and zoology studies, 2018
The present investigation was conducted to study the diversity of Carabids in Gerbera and Gladiol... more The present investigation was conducted to study the diversity of Carabids in Gerbera and Gladiolus crops of Jorhat, Assam during the year 2014 2015 and 2015 2016. The specimens were identified by following published keys and literature and described on the basis of observed morphological characteristics. Results found a total 8 species of carabids belonging to 4 genera viz., Clivina, Scarites, Harpalus, and Sparostes under 3 tribesClivinini, Scaritini and Harpalini 2 subfamily (Scaritinae and Harpalinae) from the flower crop Gerbera and Gladiolus. Among these 8 species, 3 under genera Clivina viz., C. assamensis, C. memnonia, C. lobata and 2 under Scarites and Harpalus, viz., S. indus, S. inconspicuous, H. rufipes, H. calceatus and one from Sparostes viz., Sparostes striatulus. Among all the species, S. indus, C. assamensis and S. inconspicuous were relatively more abundance with 18.75%, 16.75%, 15%, respectively. The species richness, species diversity and species evenness were co...
International Journal of Tropical Insect Science, 2020
The yellow banded wasp, Vespa cincta F. is one of the most destructive pests of honeybee colonies... more The yellow banded wasp, Vespa cincta F. is one of the most destructive pests of honeybee colonies in India. Despite high species richness, there is diminutive information on the intraspecific variations occurring in the wasp from different geographical regions. The present study was undertaken to ascertain if any intraspecific variability existed in populations of V. cincta from four geographical regions of Assam, India. The adult specimens from each region were studied using 24 morphological characters, as well as with genetic markers subjected to PCR. No significant variation was recorded for 15 morphological characters; however, nine characters viz., body length, thorax length and width, mandible length and width, fore wing width, fore leg width, hind leg width, and sting width were significantly larger in specimens collected from Barak Valley and Hill Zone (BVHZ) as compared to specimens from Upper Brahmaputra Valley Zone (UBVZ), Lower Brahmaputra Valley Zone (LBVZ) and North Ba...