Effect of agronomic practices on yellow rice stem borer, Scirpophaga incertulas (Walker)
2016
Soomro, N.M. (University of Sindh, Jamshoro (Pakistan). Dept. of Zoology) | Ursani, T.J. (University of Sindh, Jamshoro (Pakistan). Dept. of Zoology) | Soomro, M.H. (University of Sindh, Jamshoro (Pakistan). Dept. of Zoology) | Malik, S. | Dhuyo, A.R.
The experiments were conducted to study the effect of agronomic practices like cutting heights of stubbles and post-harvest cultural practices on the survival and mortality of hibernating immature stages of yellow rice stem borer (YRSB), Scirpophaga incertulus (Walker). Rice stubbles at different heights i.e. 5,10,15,20 25 and 35 cm were cut above soil surface .The results indicate that as stubble height increased, the larval population decreased. No significant difference of larval population was observed between 15.00 and 20.00 cm of stubble above the soil surface. Highly significant difference was noted in the different heights of stubbles of paddy. Maximum population was noted in stubble height of 15.00 cm. The result also indicates that the harvesting at 15.00 to 20.00 cm above soil surface is recommended, because not only density of larval and pupal population is reduced but it also provides good quality straw for feeding animals. The results of post-harvest cultural practice revealed that in the ploughed rice field, lower number of larvae and pupae, and higher mortality was observed as compared with un-ploughed field. The rice field should not be left fallow or cultivated without plough. Moldboard (MB) plough uproots paddy stubbles which resulted in drying and tearing of stubbles and caused mortality of hibernating larvae of S. incertulas.
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