Entomologist Roman Khryapin has advised Moscow region dacha owners that giant American cockroaches up to 4.5 centimetres long can be eliminated using pyrethroid-based contact poison.
Speaking to news outlet Moskva 24, the biologist explained that eradicating the insects is straightforward because the species has not developed resistance to pyrethroid chemicals. He recommended selecting treatments with the maximum duration of residual action, adding that one or two procedures are usually sufficient to clear a building permanently.
Pyrethroids are a class of synthetic chemical insecticides formulated to mimic pyrethrins, natural insecticidal compounds found in chrysanthemum flowers. Unlike stomach poisons used in dietary baits, contact insecticides absorb through an insect's exoskeleton to target its nervous system, making them effective when sprayed onto surfaces where pests crawl.
Habitat and pest control
Khryapin noted that American cockroaches are the largest cockroach species adapted to live alongside humans in Russia. However, he emphasized that the species typically avoids residential living quarters, preferring industrial facilities, bathhouses, and basements due to their higher humidity levels.
Dachas are traditional seasonal cottages and country homes widely owned by urban residents across Russia. Located in rural areas outside major cities like Moscow, these properties often feature bathhouses and subterranean cellars, creating humid conditions that attract moisture-loving pests during the summer.
The entomologist cautioned that poisoned baits designed to control German cockroaches, known locally in Russia as prusaks, will fail against the larger insects. Because American cockroaches have entirely different taste preferences, standard gel baits do not attract them.
The German cockroach is a significantly smaller species measuring around 1.5 centimetres. Common across urban housing, it infests kitchens and food storage areas, where control efforts rely primarily on dietary poison gels.
Origins in the Moscow region
Khryapin's guidance follows a report published in early August by media outlet Mash, which claimed that giant American cockroaches imported alongside foreign cargo, shipping containers, and goods had overrun Russian dachas.
However, Khryapin disputed claims of a sudden foreign invasion, stating that the species has already lived in the capital region for a long time.
The American cockroach, scientifically known as Periplaneta americana, is a widespread urban pest found in heated buildings and underground utility networks worldwide. Despite its name, the species originated in tropical regions before spreading globally along international shipping and trade routes.
