Amar N. Sharma - Academia.edu (original) (raw)
Papers by Amar N. Sharma
Genetic Resources and Crop Evolution, 2020
Soybean anthracnose caused by Colletotrichum truncatum (Schw.) Andrus & W.D. Moore is a devas... more Soybean anthracnose caused by Colletotrichum truncatum (Schw.) Andrus & W.D. Moore is a devastating disease in Central and Southern India. Chemical control of this disease is neither economical nor eco-friendly and genetic resistance is considered to be an efficient means for its management. Therefore, in the current study, a total of 225 soybean [Glycine max (L.) Merr.] germplasm accessions were evaluated for anthracnose resistance which resulted in the identification of five genotypes viz., EC 538828, EC 34372, EC 457254, AKSS 67 and Karune as highly resistant. Genetics of anthracnose resistance in three F2 populations derived from EC 34372 × JS 95-60, EC 457254 × JS 95-60 and AKSS 67 × JS 95-60 revealed that the resistance in all the three resistant parents was governed by two major genes interacting in complementary fashion. The χ2 test for goodness of fit revealed that F2 plants in each of the three populations segregated in 9 resistant: 7 susceptible ratio. This is the first report on genetics of anthracnose resistance in soybean and will aid soybean breeders to develop a strategic anthracnose resistance breeding program and to map the genes governing resistance. Research findings from this study indicated the potential role of exotic germplasm in Indian soybean improvement against anthracnose disease.
Girdle beetle happens to be a serious insect pest causing yield losses between 14 to 42 per cent ... more Girdle beetle happens to be a serious insect pest causing yield losses between 14 to 42 per cent in soybean. The incidence of this insect pest is related to the prevailing weather conditions. It is in this context, we intended to ascertain pertinent weather parameters that directly influence the girdle beetle incidence and the appropriate stage it infests and therefore necessary curative measures can be addressed to. Therefore, data survey was conducted on girdle beetle damage on soybean crop under Crop Pest Surveillance and Advisory Project (CROPSAP) in 20 districts of Maharashtra state during 2010-2015. The weekly data collected so were used for the analysis. The correlation analysis of girdle beetle damage with climatic variables showed the significant negative correlation with maximum temperature during current (TMax0 =-0.44**) and previous two lag weeks (TMax-1= -0.61**; TMax-2=-0.54**) and significant positive correlation with relative humidity in current (RH0=0.24*) and first...
Background: Intercropping and mixed cropping based on two or more different crops have been widel... more Background: Intercropping and mixed cropping based on two or more different crops have been widely used in Insect Pest Management to manage the population density of insect pests in various crops like maize with soybean, sorghum with soybean and sunflower with soybean. Genotypic diversity is the mixture or combination of various varieties/lines/genotypes of a crop. It decreases the insect-pests population by unfitness of crop to them due to intraspecific diversity such as mixture of susceptible and resistant varieties. Also, it increases the natural enemy population more due to longer period of flowering, availability of wide diverse food, more movement of herbivores etc. This concept has also been used successfully to manage insect-pests in maize, wheat and potato. In India, this connect is used in very small scale in crop. The objective of this study was to determine effects of genotypic diversity by comparing the population densities of major insect pests between monoculture of s...
Indian Journal of Plant Protection, 2013
A ready mix insecticide formulation, Alika 247 (thiamethoxam 12.6% + lambdacyhalothrin 9.4%) was ... more A ready mix insecticide formulation, Alika 247 (thiamethoxam 12.6% + lambdacyhalothrin 9.4%) was evaluated against stemfly, Melanagromyza sojae (Zehnter); girdle beetle, Obereopsis brevis (Swedenbord); semiloopers [Chrysodeixis acuta (Walker), Diachrysia orichalcea (Fabricius), and Gesonia gemma Swinhoe], and tobacco caterpillar, Spodoptera litura (Fabricius) in soybean under field conditions. Three doses of Alika; 22, 27.5, and 33 g ha−1 were tested at crop flowering as foliar spray. None of the three test doses of Alika could contain stemfly and girdle beetle damages. Whereas, Alika was found effective for semiloopers @ 27.5 and 33 g a.i. ha−1 and provided protection up to 10 days after treatment. Alika @ 27.5 g a.i. ha− 1 was also effective against tobacco caterpillar but not beyond one day after treatment.
Efficacy of crude aqueous extracts of eight plant species was assessed against Spodoptera litura ... more Efficacy of crude aqueous extracts of eight plant species was assessed against Spodoptera litura larvae at 25, 50, 75 and 100 % concentrations alone and in combination with Bacillus thuringiensis sub sp. kurstaki Berliner (Btk) under controlled laboratory conditions. Leaf extracts of Acacia arabica and Annona squamosa were found most promising causing 76.66 % and 83.33 % larval mortality respectively at 25 % concentration within 3 days of treatment. Leaf extract of Datura stramonium inflicted 93.33 % larval mortality at 50 % concentration within 4 days. When used in combination with Btk, increased larval mortality could be observed vis-à-vis plant extracts alone in cases of seed extracts of A. arabica, A. squamosa and D. stramonium and leaf extract of Pongamia pinnata only on 3 days of treatment and onwards indicating synergistic effect. However, leaf extracts of A. arabica, A. squamosa, D. stramonium, Eucalyptus globulus, Ipomoea carnea, Lantana camara and Nicotiana tabacum had ant...
Legume Research - An International Journal, 2015
Flubendiamide 20 WG, a benzenedicarboxamide compound with novel mode of action was evaluated agai... more Flubendiamide 20 WG, a benzenedicarboxamide compound with novel mode of action was evaluated against the major lepidopteron defoliators of soybean namely, Chrysodeixis acuta (Walker), Diachrysia orichalcea (Fabricius), Gesonia gemma Swinhoe, and Spodoptera litura (Fabricius) during 2010 and 2012 rainy seasons under the field conditions at Indore. Three application rates; 50, 60 and 120 g a.i. ha-1 of Flubendiamide 20 WG were tested in comparison to the conventional insecticides viz., Endosulfan 35 EC @ 250g a.i. ha-1 (2010) and Triazophos 40 EC @ 320 g a.i. ha-1 (2012). The application rate of 60 g a.i. ha-1 of Flubendiamide 20 WG was found most effective with better incremental cost benefit ratio as compared to the check insecticides. It has provided significantly better protection to soybean crop from the lepidopteron defoliators up to 15 days after spraying.
International Journal of Tropical Insect Science, 2011
Combinations of Bacillus thuringiensis subsp. kurstaki (Btk) and some plant extracts, namely Acac... more Combinations of Bacillus thuringiensis subsp. kurstaki (Btk) and some plant extracts, namely Acacia arabica (Lam.) Willd., Annona squamosa L., Datura stramonium L., Eucalyptus globulus (Labille), Ipomoea carnea Jacq., Lantana camara L., Nicotiana tabacum L. and Pongamia pinnata (L.) Pierre, were studied for their efficacy and synergistic activity against Spodoptera litura (Fab.) larvae. D. stramonium seed extract fortified with Btk recorded highest mean larval mortality of 74.7%, followed by 61% with A. arabica seed extract, 54.4% with N. tabacum leaf extract and 53% with A. squamosa seed extract. Combination of A. arabica seed extract at 25% concentration and Btk resulted in considerable mortality within 24 h. All Btk fortified extracts caused higher larval mortality than with Btk alone, indicating synergistic action except for the A. arabica leaf extract and Btk combination, which showed antagonistic effect.
Indian Journal of Agricultural Sciences, 2000
The two procedures for grouping genotypes: The All‐India Co‐ordinated Research Project on Soybean... more The two procedures for grouping genotypes: The All‐India Co‐ordinated Research Project on Soybean (AICRPS) method and a novel ‘maximin‐minimax’ approach, were compared for their effectiveness. Sixteen soybean (Glycine max (L.) Merrill) genotypes are grouped into different categories of resistance by using data from field experiments conducted during the rainy seasons of 1993 and 1994. According to the AICRPS method, which
Flubendiamide 20 WG, a benzenedicarboxamide compound with novel mode of action was evaluated agai... more Flubendiamide 20 WG, a benzenedicarboxamide compound with novel mode of action was evaluated against the major lepidopteron defoliators of soybean namely, Chrysodeixis acuta (Walker), Diachrysia orichalcea (Fabricius), Gesonia gemma Swinhoe, and Spodoptera litura (Fabricius) during 2010 and 2012 rainy seasons under the field conditions at Indore. Three application rates; 50, 60 and 120 g a.i. ha -1 of Flubendiamide 20 WG were tested in comparison to the conventional insecticides viz., Endosulfan 35 EC @ 250g a.i. ha -1 (2010) and Triazophos 40 EC @ 320 g a.i. ha -1 (2012). The application rate of 60 g a.i. ha -1 of Flubendiamide 20 WG was found most effective with better incremental cost benefit ratio as compared to the check insecticides. It has provided significantly better protection to soybean crop from the lepidopteron defoliators up to 15 days after spraying.
Efficacy of crude aqueous extracts of eight plant species was assessed against Spodoptera litura ... more Efficacy of crude aqueous extracts of eight plant species was assessed against Spodoptera litura larvae at 25, 50, 75 and 100 % concentrations alone and in combination with Bacillus thuringiensis sub sp. kurstaki Berliner (Btk) under controlled laboratory conditions. Leaf extracts of Acacia arabica and Annona squamosa were found most promising causing 76.66 % and 83.33 % larval mortality respectively at 25 % concentration within 3 days of treatment. Leaf extract of Datura stramonium inflicted 93.33 % larval mortality at 50 % concentration within 4 days. When used in combination with Btk, increased larval mortality could be observed vis-à-vis plant extracts alone in cases of seed extracts of A. arabica, A. squamosa and D. stramonium and leaf extract of Pongamia pinnata only on 3 days of treatment and onwards indicating synergistic effect. However, leaf extracts of A. arabica, A. squamosa, D. stramonium, Eucalyptus globulus, Ipomoea carnea, Lantana camara and Nicotiana tabacum had antagonistic effect when used in combination with Btk.
Combinations of Bacillus thuringiensis subsp. kurstaki (Btk) and some plant extracts, namely Acac... more Combinations of Bacillus thuringiensis subsp. kurstaki (Btk) and some plant extracts, namely Acacia arabica (Lam.) Willd., Annona squamosa L., Datura stramonium L., Eucalyptus globulus (Labille), Ipomoea carnea Jacq., Lantana camara L., Nicotiana tabacum L. and Pongamia pinnata (L.) Pierre, were studied for their efficacy and synergistic activity against Spodoptera litura (Fab.) larvae. D. stramonium seed extract fortified with Btk recorded highest mean larval mortality of 74.7%, followed by 61% with A. arabica seed extract, 54.4% with N. tabacum leaf extract and 53% with A. squamosa seed extract. Combination of A. arabica seed extract at 25% concentration and Btk resulted in considerable mortality within 24 h. All Btk fortified extracts caused higher larval mortality than with Btk alone, indicating synergistic action except for the A. arabica leaf extract and Btk combination, which showed antagonistic effect.
Genetic Resources and Crop Evolution, 2020
Soybean anthracnose caused by Colletotrichum truncatum (Schw.) Andrus & W.D. Moore is a devas... more Soybean anthracnose caused by Colletotrichum truncatum (Schw.) Andrus & W.D. Moore is a devastating disease in Central and Southern India. Chemical control of this disease is neither economical nor eco-friendly and genetic resistance is considered to be an efficient means for its management. Therefore, in the current study, a total of 225 soybean [Glycine max (L.) Merr.] germplasm accessions were evaluated for anthracnose resistance which resulted in the identification of five genotypes viz., EC 538828, EC 34372, EC 457254, AKSS 67 and Karune as highly resistant. Genetics of anthracnose resistance in three F2 populations derived from EC 34372 × JS 95-60, EC 457254 × JS 95-60 and AKSS 67 × JS 95-60 revealed that the resistance in all the three resistant parents was governed by two major genes interacting in complementary fashion. The χ2 test for goodness of fit revealed that F2 plants in each of the three populations segregated in 9 resistant: 7 susceptible ratio. This is the first report on genetics of anthracnose resistance in soybean and will aid soybean breeders to develop a strategic anthracnose resistance breeding program and to map the genes governing resistance. Research findings from this study indicated the potential role of exotic germplasm in Indian soybean improvement against anthracnose disease.
Girdle beetle happens to be a serious insect pest causing yield losses between 14 to 42 per cent ... more Girdle beetle happens to be a serious insect pest causing yield losses between 14 to 42 per cent in soybean. The incidence of this insect pest is related to the prevailing weather conditions. It is in this context, we intended to ascertain pertinent weather parameters that directly influence the girdle beetle incidence and the appropriate stage it infests and therefore necessary curative measures can be addressed to. Therefore, data survey was conducted on girdle beetle damage on soybean crop under Crop Pest Surveillance and Advisory Project (CROPSAP) in 20 districts of Maharashtra state during 2010-2015. The weekly data collected so were used for the analysis. The correlation analysis of girdle beetle damage with climatic variables showed the significant negative correlation with maximum temperature during current (TMax0 =-0.44**) and previous two lag weeks (TMax-1= -0.61**; TMax-2=-0.54**) and significant positive correlation with relative humidity in current (RH0=0.24*) and first...
Background: Intercropping and mixed cropping based on two or more different crops have been widel... more Background: Intercropping and mixed cropping based on two or more different crops have been widely used in Insect Pest Management to manage the population density of insect pests in various crops like maize with soybean, sorghum with soybean and sunflower with soybean. Genotypic diversity is the mixture or combination of various varieties/lines/genotypes of a crop. It decreases the insect-pests population by unfitness of crop to them due to intraspecific diversity such as mixture of susceptible and resistant varieties. Also, it increases the natural enemy population more due to longer period of flowering, availability of wide diverse food, more movement of herbivores etc. This concept has also been used successfully to manage insect-pests in maize, wheat and potato. In India, this connect is used in very small scale in crop. The objective of this study was to determine effects of genotypic diversity by comparing the population densities of major insect pests between monoculture of s...
Indian Journal of Plant Protection, 2013
A ready mix insecticide formulation, Alika 247 (thiamethoxam 12.6% + lambdacyhalothrin 9.4%) was ... more A ready mix insecticide formulation, Alika 247 (thiamethoxam 12.6% + lambdacyhalothrin 9.4%) was evaluated against stemfly, Melanagromyza sojae (Zehnter); girdle beetle, Obereopsis brevis (Swedenbord); semiloopers [Chrysodeixis acuta (Walker), Diachrysia orichalcea (Fabricius), and Gesonia gemma Swinhoe], and tobacco caterpillar, Spodoptera litura (Fabricius) in soybean under field conditions. Three doses of Alika; 22, 27.5, and 33 g ha−1 were tested at crop flowering as foliar spray. None of the three test doses of Alika could contain stemfly and girdle beetle damages. Whereas, Alika was found effective for semiloopers @ 27.5 and 33 g a.i. ha−1 and provided protection up to 10 days after treatment. Alika @ 27.5 g a.i. ha− 1 was also effective against tobacco caterpillar but not beyond one day after treatment.
Efficacy of crude aqueous extracts of eight plant species was assessed against Spodoptera litura ... more Efficacy of crude aqueous extracts of eight plant species was assessed against Spodoptera litura larvae at 25, 50, 75 and 100 % concentrations alone and in combination with Bacillus thuringiensis sub sp. kurstaki Berliner (Btk) under controlled laboratory conditions. Leaf extracts of Acacia arabica and Annona squamosa were found most promising causing 76.66 % and 83.33 % larval mortality respectively at 25 % concentration within 3 days of treatment. Leaf extract of Datura stramonium inflicted 93.33 % larval mortality at 50 % concentration within 4 days. When used in combination with Btk, increased larval mortality could be observed vis-à-vis plant extracts alone in cases of seed extracts of A. arabica, A. squamosa and D. stramonium and leaf extract of Pongamia pinnata only on 3 days of treatment and onwards indicating synergistic effect. However, leaf extracts of A. arabica, A. squamosa, D. stramonium, Eucalyptus globulus, Ipomoea carnea, Lantana camara and Nicotiana tabacum had ant...
Legume Research - An International Journal, 2015
Flubendiamide 20 WG, a benzenedicarboxamide compound with novel mode of action was evaluated agai... more Flubendiamide 20 WG, a benzenedicarboxamide compound with novel mode of action was evaluated against the major lepidopteron defoliators of soybean namely, Chrysodeixis acuta (Walker), Diachrysia orichalcea (Fabricius), Gesonia gemma Swinhoe, and Spodoptera litura (Fabricius) during 2010 and 2012 rainy seasons under the field conditions at Indore. Three application rates; 50, 60 and 120 g a.i. ha-1 of Flubendiamide 20 WG were tested in comparison to the conventional insecticides viz., Endosulfan 35 EC @ 250g a.i. ha-1 (2010) and Triazophos 40 EC @ 320 g a.i. ha-1 (2012). The application rate of 60 g a.i. ha-1 of Flubendiamide 20 WG was found most effective with better incremental cost benefit ratio as compared to the check insecticides. It has provided significantly better protection to soybean crop from the lepidopteron defoliators up to 15 days after spraying.
International Journal of Tropical Insect Science, 2011
Combinations of Bacillus thuringiensis subsp. kurstaki (Btk) and some plant extracts, namely Acac... more Combinations of Bacillus thuringiensis subsp. kurstaki (Btk) and some plant extracts, namely Acacia arabica (Lam.) Willd., Annona squamosa L., Datura stramonium L., Eucalyptus globulus (Labille), Ipomoea carnea Jacq., Lantana camara L., Nicotiana tabacum L. and Pongamia pinnata (L.) Pierre, were studied for their efficacy and synergistic activity against Spodoptera litura (Fab.) larvae. D. stramonium seed extract fortified with Btk recorded highest mean larval mortality of 74.7%, followed by 61% with A. arabica seed extract, 54.4% with N. tabacum leaf extract and 53% with A. squamosa seed extract. Combination of A. arabica seed extract at 25% concentration and Btk resulted in considerable mortality within 24 h. All Btk fortified extracts caused higher larval mortality than with Btk alone, indicating synergistic action except for the A. arabica leaf extract and Btk combination, which showed antagonistic effect.
Indian Journal of Agricultural Sciences, 2000
The two procedures for grouping genotypes: The All‐India Co‐ordinated Research Project on Soybean... more The two procedures for grouping genotypes: The All‐India Co‐ordinated Research Project on Soybean (AICRPS) method and a novel ‘maximin‐minimax’ approach, were compared for their effectiveness. Sixteen soybean (Glycine max (L.) Merrill) genotypes are grouped into different categories of resistance by using data from field experiments conducted during the rainy seasons of 1993 and 1994. According to the AICRPS method, which
Flubendiamide 20 WG, a benzenedicarboxamide compound with novel mode of action was evaluated agai... more Flubendiamide 20 WG, a benzenedicarboxamide compound with novel mode of action was evaluated against the major lepidopteron defoliators of soybean namely, Chrysodeixis acuta (Walker), Diachrysia orichalcea (Fabricius), Gesonia gemma Swinhoe, and Spodoptera litura (Fabricius) during 2010 and 2012 rainy seasons under the field conditions at Indore. Three application rates; 50, 60 and 120 g a.i. ha -1 of Flubendiamide 20 WG were tested in comparison to the conventional insecticides viz., Endosulfan 35 EC @ 250g a.i. ha -1 (2010) and Triazophos 40 EC @ 320 g a.i. ha -1 (2012). The application rate of 60 g a.i. ha -1 of Flubendiamide 20 WG was found most effective with better incremental cost benefit ratio as compared to the check insecticides. It has provided significantly better protection to soybean crop from the lepidopteron defoliators up to 15 days after spraying.
Efficacy of crude aqueous extracts of eight plant species was assessed against Spodoptera litura ... more Efficacy of crude aqueous extracts of eight plant species was assessed against Spodoptera litura larvae at 25, 50, 75 and 100 % concentrations alone and in combination with Bacillus thuringiensis sub sp. kurstaki Berliner (Btk) under controlled laboratory conditions. Leaf extracts of Acacia arabica and Annona squamosa were found most promising causing 76.66 % and 83.33 % larval mortality respectively at 25 % concentration within 3 days of treatment. Leaf extract of Datura stramonium inflicted 93.33 % larval mortality at 50 % concentration within 4 days. When used in combination with Btk, increased larval mortality could be observed vis-à-vis plant extracts alone in cases of seed extracts of A. arabica, A. squamosa and D. stramonium and leaf extract of Pongamia pinnata only on 3 days of treatment and onwards indicating synergistic effect. However, leaf extracts of A. arabica, A. squamosa, D. stramonium, Eucalyptus globulus, Ipomoea carnea, Lantana camara and Nicotiana tabacum had antagonistic effect when used in combination with Btk.
Combinations of Bacillus thuringiensis subsp. kurstaki (Btk) and some plant extracts, namely Acac... more Combinations of Bacillus thuringiensis subsp. kurstaki (Btk) and some plant extracts, namely Acacia arabica (Lam.) Willd., Annona squamosa L., Datura stramonium L., Eucalyptus globulus (Labille), Ipomoea carnea Jacq., Lantana camara L., Nicotiana tabacum L. and Pongamia pinnata (L.) Pierre, were studied for their efficacy and synergistic activity against Spodoptera litura (Fab.) larvae. D. stramonium seed extract fortified with Btk recorded highest mean larval mortality of 74.7%, followed by 61% with A. arabica seed extract, 54.4% with N. tabacum leaf extract and 53% with A. squamosa seed extract. Combination of A. arabica seed extract at 25% concentration and Btk resulted in considerable mortality within 24 h. All Btk fortified extracts caused higher larval mortality than with Btk alone, indicating synergistic action except for the A. arabica leaf extract and Btk combination, which showed antagonistic effect.