Seasonal occurrence of adult Haliplus sharpi Wehncke in paddy fields of southwestern Shikoku, Japan

Abstract

The seasonal occurrence of adult Haliplus sharpi Wehncke was examined using quantitative monitoring in two paddy fields in southwestern Shikoku, Japan. A total of 994 individuals were recorded throughout one season of irrigated rice cultivation; thus, paddy fields can be considered one important habitat type for adult H. sharpi. Our results suggested that traditional open channels, called "IDE," were the most important paddy habitat for this species. Additionally, insecticide application (probenazole 10%, benfuracarb 8%) did not appear to have a large effect on the abundance of adult H. sharpi.