What Makes It Residual?
Tuesday October 9, 2012
Please explain to me how some of today's "residual insecticides" actually have a residual effect on bed bugs? I certainly have my doubts that there are residual properties of insecticides outside of DE or insecticide dusts that penetrate the exoskeletons of these bugs.
Don't you just love terminology, particularly when there may not be any clearly defined rules regarding certain terms? Within pest management and the use of insecticides we may loosely divide products into those that have no residual and are expected only to kill or affect the pest "on contact", and then to rapidly disintegrate so that they no longer are available. The top prize here probably goes to pyrethrum, which we know breaks down rapidly when exposed to UV light, heat, etc. Or, we place insecticides into the group we call "residual" products, meaning they stick around for some highly variable length of time, and this length of useful residual varies wildly depending on what they are and where they are applied. The old chlordane applied to the cool, dark, dry soil under a slab might remain there at a level high enough... Read more
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