Views:90 Author:Site Editor Publish Time: 2021-11-18 Origin:Site
The main problem with controlling infestations of cockroaches is ensuring that enough insecticide gets to a sufficiently large proportion of the population to effect control. Cockroach infestations have been treated with insecticidal sprays, dusts, gels, sand baits, etc. Cockroach bait may consist of simple poisons, killing from direct feeding only, to the latest insecticides which use delayed transferred toxic action, which can reach a sufficiently high proportion of the cockroach population to achieve effective control in a short period of time.
Secondary transmission of toxic baits
Cockroaches eat the feces of other roaches and they feed on each other. After consuming a lethal dose of a residual bait insecticide known to have delayed toxicant activity, cockroaches return to the harborage where they excrete feces. The insecticide-laden feces, fluids and eventual carcass, can contain sufficient residual pesticide to kill others in the same nesting site. As the roach staggers around for hours or even days, it infects other roaches in the nest, with toxicant transfer through feces, which then go on to infect others. This secondary transmission occurs through direct contact with, or ingestion of, traces of baits dispersed in the environment by contaminated cockroaches. These traces were either deposited by “trampling” in the environment or on dead contaminated cockroaches. The cascading effect goes on to wipe out whole colonies from indirect exposure by contact with the corpses, feces, or harborages of cockroaches previously exposed.
Such nests, when contaminated with sufficient residual pesticide via faeces, secretions, exuviae, or corpses provide an important reservoir of pesticide, which would be available to infect co species. Residual pesticides by virtue of their efficacy against cockroaches, their deployment in secure bait stations, and the way in which the active toxicant is transmitted to cockroaches that have not fed on the baits, offer an effective and environmentally compatible way of controlling cockroaches.
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