the effect of different larval density of chilo suppressalis (lepidoptera: pyralidae) on rice infestation in controlled condition

abstract the effect of different larval density of chilo suppressalis walker was evaluated through 2006-2008 on rice infestation in controlled condition of the cages. the results indicated that there were significant effects between dead hearts, white heads and crop yield. the highest dead hearts and white heads were related to the treatment of 32 larvae per m2 and the lowest ones were obtained in control (without release of larvae). also, the highest crop yield was determined for the treatment control and the lowest was related to the treatment 32 larvae per m2.