Indian Journal of Entomology

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Biology and Nutritional Indices of the Fall Army Worm Spodoptera Frugiperda (J E Smith) on Maize


Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
2 Department of Seed Science and Technology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
3 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
4 Department of Farm Management, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
 

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, conversion
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  • Biology and Nutritional Indices of the Fall Army Worm Spodoptera Frugiperda (J E Smith) on Maize

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Authors

P. S. Rajisha
Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
N. Muthukrishnan
Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
S. Jeyarajan Nelson
Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
R. Jerlin
Department of Seed Science and Technology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
P. Marimuthu
Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
R. Karthikeyan
Department of Farm Management, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India

Abstract


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, conversion

References





DOI: https://doi.org/10.55446/IJE.2021.328