Importance

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Abstract

A wood preservative that comprises as an active ingredient a Piper methysticum, plant or a processed product thereof or a compound represented by Formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.16 are same or different and each denotes a hydrogen atom, hydroxy or a C.sub.1-4 alkoxy, or R.sup.1 and R.sup.2 are taken together to form a group represented by --O--(CH.sub.2).sub.n --O-- wherein n is an integer of 1 to 3, R.sup.5 is a C.sub.1-4 alkoxy and X is --CH.dbd.CH--, --CH.sub.2 --CH.sub.2 -- or epoxyethylene, and the bond: {character pullout} denotes a single bond or a double bond can prevent the attacking wood by an insect harmful to the wood and also prevents the appearance and the growth of a wood-rotting fungus or a wood- staining fungus while being highly safe to humans and animals without exerting no adverse effect on the environment.

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First Claim