Studies on the Control of Confection Insects

Abstract

In order to protect confection from vermin, the investigation on the wapped plastic films for confection and their perforation by vermin was made, and then the experiment to know what kind of films was easily perforated by vermin was tried, and furthermore the test of electric light killer for vermin was put.
These results obtained were as follows: (1) 200 samples of the wrapped plastic films of the claimed confections were tested by infrared spectra. Consequently, a large number of these films were made of polyethylene-laminated-cellophane and polypropylene, and a few were made of cellophane, dampproof-cellophane and polyethylene etc.. (2) The relationship between the above-mentioned plastic films and the vermin's perforating of them were tested by use of the nice confection for vermin, and consequently, it was found that polyethylene, cellophane and polypropylene had easily been perforated by vermin, especially by Plodia intepunctella Hbn. larvae. (3) Therefore, to keep away vermin from confection by wrapped film, as its material, polyvinylidenechloride, polyvinylchloride, polycarbonate or polyester film are necessary to be used. (4) Electric light killer was scarcely effective for the confection vermin like Plodia interpunctella Hbn. larvae.