RUDRA NARAYAN BORKAKATI | ASSAM AGRICULTURE UNIVERSITY (original) (raw)
Papers by RUDRA NARAYAN BORKAKATI
Journal of Biological Control, Jun 1, 2019
Experiment was conducted to evaluate the efficacy of six different strains of entomopathogenic fu... more Experiment was conducted to evaluate the efficacy of six different strains of entomopathogenic fungi and one insecticide molecule against sucking pests of Bhut Jalakia during 2014-15 to 2016-17. Bhut Jalakia is one of the hottest chillis in the world, grown extensively in Assam, Nagaland and Manipur. Aphis gossypii Glover, Scirtothrips dorsalis Hood and Bemisia tabaci (Genn.) are the major sucking pests of Bhut Jalakia inflicting damage right from planting to fruiting stages of the crop. Three rounds of biopesticides @ 1 × 10 8 spores/gm and insecticide (imidacloprid 17.8 SL @ 20 gm a.i./ha) imposed at 3 weeks interval against the pests revealed that imidacloprid 17.8 SL could significantly reduce the mean population of A. gossypii (4.64); S. dorsalis (2.03) and B. tabaci (0.28), closely followed by Beauveria bassiana (NBAIR-Bb-5a) with 7.20, 3.07 and 0.64 per 10 leaves and both the treatments were on par in their efficacy after third spray. The rest of the entomopathogenic fungi were more or less effective in reducing the sucking pests and statistically at par with each other compared to untreated control plot. Highest yield of 52.64 q/ha recorded in imidacloprid treated plot followed by NBAIR strain of Bb-5a with 45.85 q/ha and had no any significant difference from each other. Minimum yield of 26.78 q/ha was obtained in untreated control plot.
Annals of Plant Protection Sciences, 2016
The major insect-pests observed attacking soybean variety JS 335 were girdle beetle, Obereopsis b... more The major insect-pests observed attacking soybean variety JS 335 were girdle beetle, Obereopsis brevis; tobacco caterpillar, Spodoptera litura; green semilooper, Chrysodeixis acuta; whitefly, Bemisia tabaci and jassids, Empoasca kerri. The peak activity of girdle beetle (1.0 damaged plant per meter row) was observed during first week of October. Whereas the peak activity of caterpillar pests that is, S. litura (2.5 larvae per meter row) and C. acuta (0.7 larvae per meter row) was recorded during second fortnight of August and that of sucking pests that is, B. tabaci (3.2 whiteflies per plant) and E. kerri (3.4 jassids per plant) was recorded during last week of August and Second week of August, respectively. The biocontrol agent's three species of lady bird beetle, Menochilus sexmaculata, Coccinella septumpunctata and Coccinella transversalis and orb weaver spider, Neoscona sp. were found predating mainly upon whiteflies and jassids. Whereas, lynx spider, Oxyopes sp. and a predatory pentatomid bug, Eocanthecona furcellata was noticed sucking the body sap of lepidopterous larvae. The peak activity of lady bird beetle in second week of August and September with 0.4 grub and adult per plant, whereas the predatory pentatomid bug and spider is both last week of August with 1.1 and 1.2 bugs and spider per plant respectively.
International Journal of Current Microbiology and Applied Sciences, Sep 10, 2020
International Journal of Current Microbiology and Applied Sciences, Aug 10, 2020
International Journal of Current Microbiology and Applied Sciences, Jul 10, 2020
Journal of entomological research, 2007
In a series of experiments designed to obtain axenic growth of several species of vesicular-arbus... more In a series of experiments designed to obtain axenic growth of several species of vesicular-arbuscular (VA) mycorrhizal fungi, it was
Journal of entomology and zoology studies, 2020
Potato variety "Kufri Megha" was raised in 18 m 2 plot containing 9 treatments including control ... more Potato variety "Kufri Megha" was raised in 18 m 2 plot containing 9 treatments including control and was replicated 4 times. The treatments were Metarhizium anisopliae (AAU strain, Biometa) 15 kg/ha; Beauveria bassiana (AAU strain, Biosona) 15kg /ha; Imidacloprid 20 g a.i./ha as soil drenching; Malathion 5% dust 40kg/ha as soil application; Metarhizium anisopliae (Ma4-NBAII strain)15 kg /ha; Metarhizium anisopliae (Ma35-NBAII strain) 15kg /ha; Beauveria bassiana (Bb5a-NBAII strain) 15 kg /ha; Beauveria bassiana (Bb23-NBAII strain) 15 kg /ha, along with imidacloprid 17.8 SL @ 20 g. a.i. /ha (0.4 ml/l) and Malathion 5% dust 40kg/ha taken as standard check and Untreated control against subterranean pests of Potato. Among the various treatments evaluated against potato, imidacloprid was the most effective and proved to be the best in reducing the population of red ant (
Indian journal of entomology, 2019
Journal of Agrometeorology, Oct 24, 2021
Journal of Experimental Agriculture International
Krishi Vigyan Kendra, Nagaon has been full-fledged established in 2004 and the institution has be... more Krishi Vigyan Kendra, Nagaon has been full-fledged established in 2004 and the institution has been working betterment of the rural livelihood till date. On the basis of Participatory Rural Appraisal (PRA), KVK, Nagaon planned different activities according to the thrust area. On the basis of requirement of the rural community various activities like On Farm Testing, Front Line Demonstration, Training were conducted in order to test performance parameters of newly released varieties of field crops and improved technologies. With an objective to evaluate the impact of different KVK activities disseminated the study was conducted in Nagaon district of Assam covering 40 numbers of beneficiaries. The primary data required for the study were collected from selected sample respondents through specially prepared schedules included the data relating to the profile of respondents, adoption of various improved agricultural practices. various approaches by which help progressive farmers to ach...
Indian Journal of Entomology, 2018
Journal of entomology and zoology studies, 2019
Field experiments were conducted during 2015-16 and 2016-17 to study the impact of habitat manipu... more Field experiments were conducted during 2015-16 and 2016-17 to study the impact of habitat manipulation on the incidence of major pests of cabbage and their natural enemies revealed that out of four modules, T1 module (Cabbage intercropped with cowpea and mustard as border crop) was found to be the best in reducing the larval population of Plutella xylostella (1.89 / plant), Pieris canidia (2.82/plant), Agrotis ipsilon (1.26 /plant) and Brevicoryne brassicae (2.03 aphid/leaves). The highest numbers of Coccinellid predator (1.81/ leaves) with highest yield of (17872 kg/ha) and highest cost benefit ratio (1: 4.60) also recorded from the same module. Thus cabbage intercropped with cowpea and mustard as border crop could be adopted to get rid of key pests of cabbage.
Indian Journal Of Entomology, 2021
Field experiment was conducted to evaluate the efficacy of egg parasitoid, Trichogramma chilonis ... more Field experiment was conducted to evaluate the efficacy of egg parasitoid, Trichogramma chilonis Ishii against sugarcane Plassey borer Chilo tumidicastalis Hampson. It was observed that the incidence of C. tumidicostalis in chemical control plot was 15.02% in comparison to 11.49% in parasitoid released plot. These revealed a significant difference between the treatments resulting in 55.77% reduction in damage. The mean % parasitism of eggs of C. tumidicostalis in parasitoid released plot was 28.13% as against 9.85% in chemical control plot. The cane yield attributed in parasitoid released plot was 74.15 t/ ha as compared to 69.23 and 49.74 t/ ha in chemical and untreated plots, respectively. A net return of Rs. 101221/ ha was achieved in the parasitoid released plots as against Rs. 87179/ ha in case of chemical control plot. Maximum cost benefit ratio was obtained with T. chilonis released plot (1:2.15) followed by chemical control (1:1.70).
Indian Journal of Entomology, 2020
International Journal of Current Microbiology and Applied Sciences, 2020
The omnipresent, free-floating perennial aquatic herb, water hyacinth is known to originate in th... more The omnipresent, free-floating perennial aquatic herb, water hyacinth is known to originate in the Amazon basin of South America. It has been distributed worldwide through travel and trades in different times of history. Though it was brought to India for ornamental purpose, due to higher rate of multiplication, it has become one of the major noxious aquatic weeds and spread almost all the water bodies in Indian sub-continent, including main rivers like Brahmaputra, Cauvery, and Ganga. Problems created by water hyacinth are associated with navigation, flood control, agriculture, irrigation, drainage and conservation of wild life. Water hyacinth weevils are the important bio- control agent of water hyacinth. First shipment of water hyacinth weevils were released in Assam during the year 1988. So,an experiment had designed to study the biology of these weevils and result of the experiment can provide a better idea about favourable environmental condition for these weevils to perform e...
Annals of Plant Protection Sciences, 2016
The results revealed that the infestation and severity of insect pests were highly influenced by ... more The results revealed that the infestation and severity of insect pests were highly influenced by weather parameters. Population of aphid reached its peak (6.80 & 7.20/leaf) during March, 2014 and 2015, respectively. The maximum population of thrips (1.40/leaf) was observed during April, 2014 and (1.53/leaf) during March, 2015. The peak incidence of mite (28.0/leaf) was recorded during April, 2015 and (26.6/leaf) during March, 2015. Coccinella transversalis and Micraspis discolor were the most dominant predator species observed throughout the cropping season. The maximum population of coccinellids (1.86 & 1.80/plant) was observed during March, 2014 and 2015, respectively. All the insect population and coccinellid predators showed significant positive correlation with maximum temperature.
Journal of Biological Control, Jun 1, 2019
Experiment was conducted to evaluate the efficacy of six different strains of entomopathogenic fu... more Experiment was conducted to evaluate the efficacy of six different strains of entomopathogenic fungi and one insecticide molecule against sucking pests of Bhut Jalakia during 2014-15 to 2016-17. Bhut Jalakia is one of the hottest chillis in the world, grown extensively in Assam, Nagaland and Manipur. Aphis gossypii Glover, Scirtothrips dorsalis Hood and Bemisia tabaci (Genn.) are the major sucking pests of Bhut Jalakia inflicting damage right from planting to fruiting stages of the crop. Three rounds of biopesticides @ 1 × 10 8 spores/gm and insecticide (imidacloprid 17.8 SL @ 20 gm a.i./ha) imposed at 3 weeks interval against the pests revealed that imidacloprid 17.8 SL could significantly reduce the mean population of A. gossypii (4.64); S. dorsalis (2.03) and B. tabaci (0.28), closely followed by Beauveria bassiana (NBAIR-Bb-5a) with 7.20, 3.07 and 0.64 per 10 leaves and both the treatments were on par in their efficacy after third spray. The rest of the entomopathogenic fungi were more or less effective in reducing the sucking pests and statistically at par with each other compared to untreated control plot. Highest yield of 52.64 q/ha recorded in imidacloprid treated plot followed by NBAIR strain of Bb-5a with 45.85 q/ha and had no any significant difference from each other. Minimum yield of 26.78 q/ha was obtained in untreated control plot.
Annals of Plant Protection Sciences, 2016
The major insect-pests observed attacking soybean variety JS 335 were girdle beetle, Obereopsis b... more The major insect-pests observed attacking soybean variety JS 335 were girdle beetle, Obereopsis brevis; tobacco caterpillar, Spodoptera litura; green semilooper, Chrysodeixis acuta; whitefly, Bemisia tabaci and jassids, Empoasca kerri. The peak activity of girdle beetle (1.0 damaged plant per meter row) was observed during first week of October. Whereas the peak activity of caterpillar pests that is, S. litura (2.5 larvae per meter row) and C. acuta (0.7 larvae per meter row) was recorded during second fortnight of August and that of sucking pests that is, B. tabaci (3.2 whiteflies per plant) and E. kerri (3.4 jassids per plant) was recorded during last week of August and Second week of August, respectively. The biocontrol agent's three species of lady bird beetle, Menochilus sexmaculata, Coccinella septumpunctata and Coccinella transversalis and orb weaver spider, Neoscona sp. were found predating mainly upon whiteflies and jassids. Whereas, lynx spider, Oxyopes sp. and a predatory pentatomid bug, Eocanthecona furcellata was noticed sucking the body sap of lepidopterous larvae. The peak activity of lady bird beetle in second week of August and September with 0.4 grub and adult per plant, whereas the predatory pentatomid bug and spider is both last week of August with 1.1 and 1.2 bugs and spider per plant respectively.
International Journal of Current Microbiology and Applied Sciences, Sep 10, 2020
International Journal of Current Microbiology and Applied Sciences, Aug 10, 2020
International Journal of Current Microbiology and Applied Sciences, Jul 10, 2020
Journal of entomological research, 2007
In a series of experiments designed to obtain axenic growth of several species of vesicular-arbus... more In a series of experiments designed to obtain axenic growth of several species of vesicular-arbuscular (VA) mycorrhizal fungi, it was
Journal of entomology and zoology studies, 2020
Potato variety "Kufri Megha" was raised in 18 m 2 plot containing 9 treatments including control ... more Potato variety "Kufri Megha" was raised in 18 m 2 plot containing 9 treatments including control and was replicated 4 times. The treatments were Metarhizium anisopliae (AAU strain, Biometa) 15 kg/ha; Beauveria bassiana (AAU strain, Biosona) 15kg /ha; Imidacloprid 20 g a.i./ha as soil drenching; Malathion 5% dust 40kg/ha as soil application; Metarhizium anisopliae (Ma4-NBAII strain)15 kg /ha; Metarhizium anisopliae (Ma35-NBAII strain) 15kg /ha; Beauveria bassiana (Bb5a-NBAII strain) 15 kg /ha; Beauveria bassiana (Bb23-NBAII strain) 15 kg /ha, along with imidacloprid 17.8 SL @ 20 g. a.i. /ha (0.4 ml/l) and Malathion 5% dust 40kg/ha taken as standard check and Untreated control against subterranean pests of Potato. Among the various treatments evaluated against potato, imidacloprid was the most effective and proved to be the best in reducing the population of red ant (
Indian journal of entomology, 2019
Journal of Agrometeorology, Oct 24, 2021
Journal of Experimental Agriculture International
Krishi Vigyan Kendra, Nagaon has been full-fledged established in 2004 and the institution has be... more Krishi Vigyan Kendra, Nagaon has been full-fledged established in 2004 and the institution has been working betterment of the rural livelihood till date. On the basis of Participatory Rural Appraisal (PRA), KVK, Nagaon planned different activities according to the thrust area. On the basis of requirement of the rural community various activities like On Farm Testing, Front Line Demonstration, Training were conducted in order to test performance parameters of newly released varieties of field crops and improved technologies. With an objective to evaluate the impact of different KVK activities disseminated the study was conducted in Nagaon district of Assam covering 40 numbers of beneficiaries. The primary data required for the study were collected from selected sample respondents through specially prepared schedules included the data relating to the profile of respondents, adoption of various improved agricultural practices. various approaches by which help progressive farmers to ach...
Indian Journal of Entomology, 2018
Journal of entomology and zoology studies, 2019
Field experiments were conducted during 2015-16 and 2016-17 to study the impact of habitat manipu... more Field experiments were conducted during 2015-16 and 2016-17 to study the impact of habitat manipulation on the incidence of major pests of cabbage and their natural enemies revealed that out of four modules, T1 module (Cabbage intercropped with cowpea and mustard as border crop) was found to be the best in reducing the larval population of Plutella xylostella (1.89 / plant), Pieris canidia (2.82/plant), Agrotis ipsilon (1.26 /plant) and Brevicoryne brassicae (2.03 aphid/leaves). The highest numbers of Coccinellid predator (1.81/ leaves) with highest yield of (17872 kg/ha) and highest cost benefit ratio (1: 4.60) also recorded from the same module. Thus cabbage intercropped with cowpea and mustard as border crop could be adopted to get rid of key pests of cabbage.
Indian Journal Of Entomology, 2021
Field experiment was conducted to evaluate the efficacy of egg parasitoid, Trichogramma chilonis ... more Field experiment was conducted to evaluate the efficacy of egg parasitoid, Trichogramma chilonis Ishii against sugarcane Plassey borer Chilo tumidicastalis Hampson. It was observed that the incidence of C. tumidicostalis in chemical control plot was 15.02% in comparison to 11.49% in parasitoid released plot. These revealed a significant difference between the treatments resulting in 55.77% reduction in damage. The mean % parasitism of eggs of C. tumidicostalis in parasitoid released plot was 28.13% as against 9.85% in chemical control plot. The cane yield attributed in parasitoid released plot was 74.15 t/ ha as compared to 69.23 and 49.74 t/ ha in chemical and untreated plots, respectively. A net return of Rs. 101221/ ha was achieved in the parasitoid released plots as against Rs. 87179/ ha in case of chemical control plot. Maximum cost benefit ratio was obtained with T. chilonis released plot (1:2.15) followed by chemical control (1:1.70).
Indian Journal of Entomology, 2020
International Journal of Current Microbiology and Applied Sciences, 2020
The omnipresent, free-floating perennial aquatic herb, water hyacinth is known to originate in th... more The omnipresent, free-floating perennial aquatic herb, water hyacinth is known to originate in the Amazon basin of South America. It has been distributed worldwide through travel and trades in different times of history. Though it was brought to India for ornamental purpose, due to higher rate of multiplication, it has become one of the major noxious aquatic weeds and spread almost all the water bodies in Indian sub-continent, including main rivers like Brahmaputra, Cauvery, and Ganga. Problems created by water hyacinth are associated with navigation, flood control, agriculture, irrigation, drainage and conservation of wild life. Water hyacinth weevils are the important bio- control agent of water hyacinth. First shipment of water hyacinth weevils were released in Assam during the year 1988. So,an experiment had designed to study the biology of these weevils and result of the experiment can provide a better idea about favourable environmental condition for these weevils to perform e...
Annals of Plant Protection Sciences, 2016
The results revealed that the infestation and severity of insect pests were highly influenced by ... more The results revealed that the infestation and severity of insect pests were highly influenced by weather parameters. Population of aphid reached its peak (6.80 & 7.20/leaf) during March, 2014 and 2015, respectively. The maximum population of thrips (1.40/leaf) was observed during April, 2014 and (1.53/leaf) during March, 2015. The peak incidence of mite (28.0/leaf) was recorded during April, 2015 and (26.6/leaf) during March, 2015. Coccinella transversalis and Micraspis discolor were the most dominant predator species observed throughout the cropping season. The maximum population of coccinellids (1.86 & 1.80/plant) was observed during March, 2014 and 2015, respectively. All the insect population and coccinellid predators showed significant positive correlation with maximum temperature.