Field experiments were conducted to investigate the effects of graded levels of fly ash with SSB and FYM on the incidence of rice stem borer (Scirpophaga incertulas) (Lepidoptera: Pyralidae) in rice crop in low and high Si soils under split plot design. The graded levels of fly ash incorporated in soil at five levels (0, 25, 50, 75 and 100 t/ha) one week before crop transplantation. It was found that fly ash had significant influence on the stem borer population over the control. On an average, with respect to borer incidence, higher dose of fly ash @ 100 t ha-1 markedly decreased infestation (16.9%) while, applications at 25 and 50 t ha-1 permitted slightly more dead hearts incidence, but differed significantly from control. In main plot treatments application of SSB + FYM recorded 16.1 per cent of stem borer incidence. In interaction application of fly ash @ 100 t ha-1 with SSB + FYM reported less per cent of dead hearts. Application of fly ash @ 100 t/ha had significant effect with meagre pest incidence of 11.6 per cent. Besides application of SSB and SSB+FYM alone played a major role in maintaining ETL of stem borer. The present study implies that due to suppressive effects of Si and K present in fly ash the incidence of the rice stem borer mitigated at crop vegetative stage and the use of soil incorporation strategy can create an unfavourable condition for pests to survive.
Rice, Scirpophaga incertulas, management, fly ash, SSB and FYM
Catling, D. 1992. Rice in Deep Water. International Rice Research Institute. The Macmillan Press Ltd., pp. 419-426.
Chau, L.M. and K.L. Heong. 2005. Effects of organic fertilizers on insect pest and diseases of rice. Omonrice, 13: 26-33.
Chandramani, P., R. Rajendran, P. Sivasubramanian and C. Muthiah. 2009. Management of hoppers in rice through host nutrition – A novel approach J. Biopest., 2(1): 99-106.
FAO. 2009. Statistical year book. B1-area and harvested production of cereals. FAO statistical publications pp.34.
Kruger, R.A. and A.K. Surridge. 2009. Solubilisation of silica from fly ash: interaction with root exudates. Silicon in Agriculture: 1st annual research day, South African Sugar Association. Paper No. 6.
Lee, Ho Sung Ha, Chang Hoon Lee, Yong Bok Lee and Pil Joo Kim. 2006. Fly ash effect on improving soil properties and rice productivity in Korean paddy soils. Bioresource tech., 97: 1490–1497.
Magdoff, F. and E.H. Van. 2000. Building Soils for Better Crops. SARE, Washington, DC., p. 230
Muralikannan, N. and S. Anthoniraj. 1998. Occurrence of silicate solubilizing bacteria in rice ecosystem. Madras agric. J., 85: 47- 50.
Raghupathy, B. 1993. Effect of lignite fly ash on rice. IRRN., 18(3): 27-28.
Ranasinghe, M.A.S.K. 1992. Paddy Pests in Sri Lanka. Science education series No. 30, Natural Resources energy Science Authority of Colombo (Sri Lanka), pp. 47-59.
Salim, M. and R. Masih. 1987. Efficacy of insecticides against rice borer at NARC, Islamabad. Pak. J. Agric. Res., 8(4): 477.
Sarwar, M., N. Ahmad and M. Tofique. 2010. Tolerance of different rice genotypes (Oryza sativa l.) against the infestation of rice stem borers under natural field conditions. Nucleus, 47(3): 1-7.
Slansky, F. 1990. Insect nutritional ecology as a basis for studying host plant resistance. Florida Entomol., 73: 354-378.
Subramanian, S. and A. Gopalswamy. 1990. Influence of silicate and phosphate materials on availability and uptake of silicon and phosphorus in acid soil. Oryza, 27(3): 267- 273.
