不快害虫としてのユスリカの化学的防除に関する研究 : 4. 2 種昆虫成長阻害物質製剤のセスジユスリカ幼虫に対する室内および野外試験結果

抄録

Two insect growth regulators (IGRs), diflubenzuron and methoprene, were tested against laboratory-reared larvae of Chironomus yoshimatsui. A 25% WP formulation of diflubenzuron resulted in high larval and pupal mortality when 3,7,and 10-day-old larvae were exposed to the chemical solution at a concentration from 0.312 to 2.5ppb for 15,10,and 8 days, respectively. During the same exposure periods to a 10% SR formulation of methoprene in the laboratory, the larvae and pupae suffered from insignificant mortality but the adult emergence remained low at the same concentration prepared. A drip application of diflubenzuron in a river at 1ppm concentration maintained for 60min resulted in excellent larval control with no adult emergence as measured by using adhesive tapes; however, methoprene at same rate of application to the river produced lesser control of the midge.