Composition in which light / ultraviolet light deterioration of pyrethroid compound is prevented and method for preventing light / ultraviolet light deterioration
<；P>；PROBLEM TO BE SOLVED: To provide a chemical vaporizer intended for improving pest-controlling effect or the like by efficiently impregnating/diffusing a large amount of a volatile chemical in a netty chemical holder and also capable of improving the feed efficiency of the volatile chemical in the production or the like. <；P>；SOLUTION: A holder 13 of a volatile chemical is situated and sandwiched in between the planar part of the respective flat plate parts 25a and 25b of feed sections 18a and 18b of the volatile chemical and the bottom of saucer-shaped parts 20a and 20b of the chemical vaporizer 10, wherein the bottom of the saucer-shaped parts 20a and 20b is provided with a plurality of through-holes 32. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
