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| PDF : |  06050177.pdf |
| title(En) : | Studies on Water-borne Wood Preservatives. XIX. Test Result of Chemicals against Attack by Fungi and Insects. |
| author(En) : | Takeo Shibamoto, Yoshiyuki Inoue |
| information : | Mokuzai Gakkaishi 6(5), 177-182 (1960) |
| assort : | Original Article |
| summary(En) : | Wood preseratives should have protective effects against attack by fungi, insects or marine borers. This paper deals with the evaluation of chemical substances against insects and fungi. Laboratory tests against insects were carried out using Leucotermes speratus, Coptotermes formosanus and Dinoderus minutus. Stake test was tested against Coptotermes formosanus in Kyushu district. These experiments were aimed at determining the combined action of contact, respiration and digestion poison of the chemicals. The wood block method described in JIS A 9302 was applied for comparing the preserving effectiveness against Poria vaporaria using Japanese cedar and four kinds of foreign wood. The prevention of mold growth on the test blocks was tested against Penicillium citrinum and Aspergillus flavus using cedar, lauan, ramin, plywood and soft board. The results obtained are as follows: 1) Dieldrin was effective in protection against attack by insects. 2) Tributyltin oxide and the preservatives containing three valency arsenic oxide and zinc or copper compound were very effective for protection against decay. Mixed solution of solubilized pentachlorophenol and dissolving zinc fluoride and arsenic trioxide in water that had been acidified with acetic acid had a good preserving effect against decay. 3) Decaying resistance of four kinds of foreign wood was more durable against Poria vaporaria than Japanese cedar. 4) In the cases of insecticides (emulsifiable concentrates), the inhibitory effect against fungi was quite poor. It was observed that the inhibitory concentration against molds was variable depending upon the kinds of test blocks. |