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BASF
Pyrethroids can cause a “flushing,” or repellency response from German cockroaches (Blattella germanica). Residual pyrethroid applications could be repellent for long periods, depending on the surface. These behaviors easily can go unnoticed by technicians initially but become apparent with repeated callbacks and treatments.
If repelled, the cockroaches will become determined to find new foraging routes to food and water sources — and avoid particular pyrethroid-treated areas.
Additionally, using repellent materials near bait deposits could deter or prevent cockroaches from feeding on the bait and could be at least as important as direct contamination of bait deposits. Instead, we want to increase the probability that cockroaches will walk or stay on a treated surface to be exposed to a lethal dose.
To avoid repellency issues and reduce callbacks, we recommend applying nonrepellent insecticides that kill, rather than repel, the population.
