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Rajisha, P. S.
- Biology and Nutritional Indices of the Fall Army Worm Spodoptera Frugiperda (J E Smith) on Maize
Abstract Views :117 |
PDF Views:72
Authors
P. S. Rajisha
1,
N. Muthukrishnan
1,
S. Jeyarajan Nelson
1,
R. Jerlin
2,
P. Marimuthu
3,
R. Karthikeyan
4
Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
2 Department of Seed Science and Technology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
3 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
4 Department of Farm Management, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
2 Department of Seed Science and Technology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
3 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
4 Department of Farm Management, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
Source
Indian Journal of Entomology, Vol 84, No 1 (2022), Pagination: 92-96Abstract
Lifecycle, progressive growth of larval head capsule, and nutritional indices of Spodoptera frugiperda (J E Smith) on maize (Co-H6) were studied at the Department of Agricultural Entomology, TNAU, Coimbatore during 2018-19. Incubation, total larval, and pupal periods were observed as 2-3, 13-20, and 7-11 days, respectively. The total lifecycle of male and female was 33-46 and 35-47, respectively. The head width was observed to be 0.34, 0.60, 0.89, 1.32, 1.86, and 2.36 mm from the first to the sixth instars, respectively. Linear regression analysis showed a significant relationship between larval instars and head capsule width (R2=0.0979); and geometric progression ratio was observed as 1.48. Nutritional indices were also studied for the third and fifth instar on the maize plants. Consumption index (CI) and approximate digestibility (AD) increased with larval age, while efficiency of conversion of ingested food (ECI) and efficiency of conversion of digested food (ECD) were inversely related to age. These values for the third and fifth instar were- CI= 2.30 and 2.31; AD=35.7 and 40.29; ECI=18.33 and 12.21; ECD=51.33 and 30.3, respectively.Keywords
Spodoptera frugiperda, maize, fecundity, egg, larval, pupal periods, lifecycle, stages, larval instars, head capsule width, Dyar’s law, nutritional indices, consumption, digestibility, conversionFull Text
References
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- Population Dynamics of Fall Army Worm Spodoptera Frugiperda (J E Smith) on Maize
Abstract Views :85 |
PDF Views:71
Authors
Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
2 Department of Seed Science and Technology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
3 Department of Farm Management, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
2 Department of Seed Science and Technology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
3 Department of Farm Management, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
Source
Indian Journal of Entomology, Vol 84, No 1 (2022), Pagination: 134-136Abstract
Population dynamics of the fall army worm (FAW) Spodoptera frugiperdaon maize was carried out at the research field of Tamil Nadu Agricultural University, Coimbatore (kharif and rabi, 2018 and 2019). The results revealed that maximum FAW trap catches were obtained during 34th(7.6 moths/ trap) and 5th(7.8 moths/ trap) standard weeks (SW) of kharif and rabi seasons of 2018, respectively. During 2019, a more or less similar trend was observed with a maximum during 31st(7.2 moth/ trap) and 48th (8.2 moth/ trap) SW of kharif and rabi seasons, respectively. Correlation with weather factors indicated a significant negative correlation with evening relative humidity (RH) and significant positive correlation with morning RH during 2019-20. No significant effect of weather factors was observed during 2018-19 except for a significant positive correlation with evening RH and rainfall. The correlation between larval counts and pheromone trap catches were significantly positive with r-value of 0.55 and an R2value of 0.907 during 2018-19.
Keywords
Maize, Spodoptera frugiperda, population dynamics, trap catches, temperature, relative humidity, rainfall, correlation and regression coefficients, pheromone trap, larval countsFull Text
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