松山市宮前川におけるユリウス発生と防除の変換

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This report describes the result of ten years'(1981〜1990)reserch programme undertaken to determine more effective acceptable methods control of nuisance at the Miyama River in Matsuyama. In this river polluted by foul water of homes and treatment plants, the dominant species of midges were the follwing species; Chironomus yoshimatsui, Glyptotendips pallens and Cricoropus bicinctus.G.pallens was the most abundant species at the downstream of the treatment plants and C,yosimatsui was the dominant species at the mid-stream. Many method for decreasing population of midges were tasted,r.g. removal of detritus by bulldozer or air compressure, stock with fish(carp and steed barbel),set of vinyl float and pesticides. In the early years(1981〜present),the organophosphate pesticides, temephos, chlorpyrifosmethyl and fenthion were used in order to control midges. Soon afterwards it was found that those organophosphate pesticides had no effect on the midges.Natural selection produced the poplation resistant to organophosphate. Indeed. resistance to the temephos had already been recordedin 1981. In adition,temephos resistant strains of midges had shown cross-resistance to chlorpyrifosmethlyl.From 1982,reserch was done to test the effevtiveness of the IGR (insect growth regulator). The result of trials of IGR indicate that it has considerable potenial as an alternative to organophosphate for the control of midges. Adult emergence declined by more than 95% within seven to ten days of each of the methoprene and pyriproxyfen treatment.
松山東雲女子大学・松山東雲短期大学の論文

松山市宮前川におけるユリウス発生と防除の変換

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