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In order to protect heat insulating polyurethane board, used in windowless poultry house, from insect damage caused by Alphitobius diaperinus, work has been carried out using polyurethane boards impregnated with a number of organophosphorus insecticides.Test INo insecticidal effects were shown on boards impregnated with 0.5, 1.0, 3.0 and 5.0% of tetrachlorvinphos, or on the board impregnated with 1.0% of chlorfenvinphos.A good insecticidal effect was shown on the board impregnated 0.17% of micro encapsulated diazinon. However, when the diazinon boards were used repeatedly or at temperatures below 20°C, the insecticidal effects diminished.Test IIMicro encapsulated diazinon boards and insecticide-free boards (control boards) were installed in the inside walls of windowless poultry house, and insect damage with those boards was observed over several months.Seventy five percent of the control boards were damaged by Alphitobius diaperinus and in the case of the most heavily damaged ones alive insects were found up to 10cm from the cut end.Seven out of 16 of the micro encapsulated diazinon impregnated boards were damaged by insects. However, the damage was quite on each board. Dead insects were found in the boards up to 2-3cm from the cut end surface.From the chemical analyses, it has been observed that diazinon insecticide can be impregnated into polyurethane boards and remain stable for at least one year.
日本家禽学会の論文