2019 Volume 63 Issue 4 Pages 181-188
To evaluate the relationship between the occurrence of split-hull paddies and incidence of pecky rice damage caused by two mirid pests, Stenotus rubrovittatus（Matsumura）（Heteroptera: Miridae）and Trigonotylus caelestialium（Kirkaldy）（Heteroptera: Miridae）, among eight rice varieties, we conducted release experiments in a greenhouse. For each variety, we released a male and female pair of adult mirids onto a rice panicle for 3 days with three replications. By examining the correlation between the percentage of split-hull paddies and the pest species to the incidence of pecky rice damage, only the percentage of split rice hulls was significant. There was no pest species effect, indicating adults of the two species examined have a similar potential to cause pecky rice damage. Thus, the number of split-hull paddies and the level of pecky rice damage caused by adults of the two mirid pests were related regardless of the rice variety. Further studies are needed to predict pecky rice damage caused by the two mirids in the field, because the abundance of both adults and nymphs of T. caelestialium are known to be related to the level of pecky rice damage.
