Evaluation of Treatment Schedule for Several Insect Pests on Fruit and Vegetables with Methyl Iodide Fumigation.

摘要

The mortality effects of 2 hours exposure to methyl iodide (MI) at10 or 15°C were examined using seven species of insect pests associated with fruit and vegetables. As the result of fumigation at 15°C, the larval stage of Frankliniella intonsa showed less susceptibility within two species of thrips. A dose of 9.3 mg/1 was required to obtain 100% mortality. The 3rd nymph and adult female stages of PlanoQoccus citri were more tolerant than its egg stage. 100% mortality was obtained at a dose of 29.4mg/1. As the result of fumigation at 10°C， Aphis craccivora was more tolerant than Myzus persicae. A dose of 7.7 mg/1 was required to obtain 100% mortality. Tetranychus kanzawai and Tetranychus urticae showed similar susceptibility. 100% mortality wasobtained at a dose of 13.9 mg/1. CT values were approximated by the results of the current study and prior survey, obtaining 100% mortality for each insect pest. The draft treatment schedules were then evaluated by insect pest group and commodity group.2 hours fumigation was considered a feasible schedule for aphid, spider mite and thrips, and 3 hours fumigation was recommended for mealybug.