Insecticide against flour beetle

Because of the importance of safe insecticides in the protection of foods, additional tests have been run against German cockroaches, red flour beetles, and Mexican bean beetle larvae. The residual deposit test was used on the first two insects, and a dust test on the bean beetles. The procedure for the latter method is to incorporate the materials into dusts which are distributed on bean leaves (6) piperonyl cyclonene, which is superior to butoxide against this insect, was included in this series of tests. 

In comparing the results of Ae two sets of experiments, it will be seen that red thyme was 41% less effective against LBAM than white thyme and in controlling Flour Beetle there was, in comparison, a 65% difference between the two botanical cultivars. Furthermore, the effectiveness of the essential oils drops off rapidly so that only eucalyptus, camphor, and white thyme may be considered as useful canidates. Oddly, black pepper was inactive in these assays, while in earlier work certain components of this commodity have been shown to have strong insecticidal properties. The earliest report being in 1943 (12), which was followed not only by later reports of insecticidal... 

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