2022 Volume 13 Issue 1 Pages 5-9
In Takahama Town, Fukui Prefecture, Japan, the Cephalanthera falcata, which is categorized as a vulnerable species by the Ministry of the Environment, grows naturally, and is preyed on by the Japanagromyza tokunagai In this study, to prevent the J. tokunagai from laying eggs inside the flower stem of the C. falcata, the measures of bagging treatment and an insecticide application of Cyromazine solution was used. In this experiment, we prepared three treatment groups: i) bagging treatment group ii) insecticide application group and iii) no measures group. The number of experimental tests was 2 individuals in the bagging treatment group, 2 individuals in the insecticide application group and 3 individuals in the no measures group. Bagging treatment and the first insecticide application was carried out on April 27, 2021, with the second insecticide application being carried out on May 12, 2021. Fruits were collected on November 25, 2021. The percentage of ripe seeds was 100% in the bagging treatment group, approximately 56% in the insecticide application group and 0% in the no measures group. These results indicate that bagging treatment is the most effective method of controlling the damage caused by J. tokunagai, and that insecticide application is unable to suppress the damage entirely.
