Effect of six constant temperatures viz., 18±1, 21±1, 24±1, 27±1, 30±1 and 33±10C was studied on the egg hatchability, larval pupal development and adult survival of Spilarctia obliqua. Development rate of egg, larva and pupa gradually increased with increase in temperature, while total developmental period decreased. Mean developmental period of the pest decreased from 93.73 days at 18±10C to 31.20 at 33±10C. The lowest and the highest temperatures at which no development took place were found to be 12±10C and 39±10C, respectively. Regression equations between development rate and temperature were found to be Y= 0.0189 X -0.1998 (R2=0.88) for egg, Y=0.00122 X -0.0248 (R2=0.84) for small larva (1-3rd instar), Y=0.0058 X -0.0675 (R2=0.76) for large larva (4-6th instar), Y=0.0074 X-0.1075 (R2=0.94) for pupa and Y=0.0142 X-0.4363 (R2=0.79) for adults. Developmental threshold were determined to be 10.57, 11.27, 11.55, 15.28 and 10.92oC for egg, small larva, large larva, pupa, and adult respectively with corresponding thermal constant being 52.91, 344.82, 243.90, 142.85 and 70.42 degree days (DD). Thermal constant to complete a generation was found to be 854.90 DD. This was the first studies on this aspects, these estimated thermal thresholds and degree days could be used to predict the S. obliqua activity in the field for their effective management through pest forecasting.
Constant temperature, Degree day, Spilarctia obliqua, Thermal constant, Threshold of development
Briere, J.F., Pracros, P., Roux, A.P and Pierre, J.S. (1999). A novel model of temperature-dependent development for arthropods. Environmental Entomology, 28:22-29.
Damos, P and Soultani, M.S. (2012). Temperature-driven models for insect development and vital thermal requirements. Psyche, doi:10.1155/2012/123405.
Deshmukh, P.D., Rathore, Y.S. and Bhattacharya, A.K. (1982). Effect of temperature on the growth and development of Diacrisia obliqua Walker on five host plants. Indian Journal of Entomology, 44(1): 21 -33.
Gupta, G. and Bhattacharya, A.K (2008) Assessing toxicity of post-emergence herbicides to the Spilarctia obliqua Walker (Lepidoptera: Arctiidae). Journal of Pest Science, 81 (1): 9–15.
IJSG. (2013). International Jute Study group (IJSG). Annual report 2012-13. pp 181.
Kipyatkov, V.E and Lopatina, E.B. (2010). Intra-specific variation of thermal reaction norms for development in insects: new approaches and prospects. Entomological Review, 90 (2): 163-184.
Li, L.T., Wang, Y.Q., Ma, J.F., Liu, L., Hao, Y.T., Dong, C., Gan, Y.J., Dong, Z.P., Wang, Q.Y. (2013). The effects of temperature on the development of the moth Athetis lepigone, and a prediction of field occurrence. Journal of Insect Science 13 : (103)1-13.
Padmavathi, C., Katti, G., Sailaja, V., Padmakumari, A.P., Jhansilakshmi, V., Prabhakar, M. and Prasad, Y.G. (2013). Temperature thresholds and thermal requirements for the development of the rice leaf folder, Cnaphalocrocis medinalis. Journal of Insect Science, 16(96):1-14.
Satpathy, S., Biswas, C., Sarkar, S.K., Selvaraj, K and Gotyal, B.S., De, R.K., Gawande, S.P., Ramesh Babu, V., Tripathi, A.N and Tripathi, M.K. (2013). Changing pest and disease status and prospects of pest management in jute and allied fibre crops. Presented in national seminar on Jute and allied fibres in changing times: issues and Strategies on 3-5 January, 2013, Kolkata .52p.
Satpathy, S., Selvaraj, K., Gotyal, B.S., Biswas, C., Gawande, S.P., Sarkar, S.K., De, R.K., Tripathi, A.N., Ramesh Babu, V., Mondal, K. and Meena, P.N. (2014). Problems and prospects of pest management in jute and allied fibre crops. Presented in “International Confer-ence on Natural Fibres (Jute and Allied Fibres) on 13 August, 2014, Kolkata.P 30-36.
Selvaraj, K., Chander, S. and Prasannakumar, N.R. (2014). Determination of thermal constant and development threshold of pink borer, Sesamia inferens Walker. The Proceedings of the National Academy of Sciences: Biological Sciences, DOI 10.1007/s40011-014-0348-1
Singh, G. and Singh, I. (1993). Comparative development and survival of Bihar hairy caterpillar (Spilosoma obliqua) at different temperature and on different varieties of sunflower at Ludhiana. Indian Journal of Agricultural Sciences, 63, 447-450.
Singh, S. and Sehgal, S.S. (1992). Studies on growth and development of Spilosoma obliqua Walker on different food plants. Indian Journal of Entomology, 54, 471-482.
Summers, C.G., Coviello, R.L and Gutierrez, A.P. (1984). Influence of constant temperatures on the development and reproduction of Acyrthosiphon kondoi (Homoptera: Aphididae). Environmental Entomology, 13:236-242.
Trudgill, D.L., Honek, L.D. and Van Straalen, N.M. (2005). Thermal time-concepts and utility. Annals of Applied Biology, 146:1–14.
Urra, F and Apablaza, J. (2005). Threshold temperature and thermal constant for the development of Copitarsia decolora (Lepidoptera: Noctuidae). Ciencia e Investiga-ción Agraria, 32(1): 16-23
Zalom, F.P., Goodell, L., Wilson, W. and Bentley, W. (1983). Degree days: the calculation and use of heat in pest management. Division of agricultural and natural resources, University of California, Davis, CA. USA.10 p.
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