Field studies on the control of pine beetles were conducted with some organic chemicals in the Kasuya Experiment Forest. Province of Chikuzen. Cryphalus fulvus is by far the most important and harmful bark beetle among others. The control of this bark beetle results the prevention of attack of all other beetles on the living pine trees. Both DDT and BHC have an excellent repellency effect on Cryphalus fulvus at the lowest dosage of 0.01 per cent DDT or 0.005 per cent BHC spray without giving any phytotoxic effects even on the young shoots of pine trees. Under favourable conditions the repellency effect lasts more than two months.
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