落水管理とメタアルデヒド剤によるスクミリンゴガイの直播水稲の食害防止

Abstract

The effect of a combination of drainage and methaldehyde on feeding damage to directseeded rice by the golden apple snail, Pomacea canaliculata (Lamarck), was tested under conditions of high snail density and heavy rainfall. A 10-day drainage immediately following the wet seeding and subsequent 11-day low-level water management was successful in suppressing the snail damage below an acceptable injury level when methaldehyde granules (10%) were applied at a rate of 4 kg/10 a, 4 days and 10 days after sowing. The analysis of the results of methaldehyde application revealed that the success was due mainly to its effect as feeding arrestant.