It is useful and won't attract more cockroaches.

The principle of cockroach house is to physically kill cockroaches. By the smell of attractants, cockroaches are attracted to climb into the cockroach house, and the stickers on the inner wall of the cockroach house are attached to the cockroaches entering, so as to catch cockroaches. Because the cockroach house has no effect of killing cockroaches, it can only attract some cockroaches at home who go out to hunt.

Harm

Cockroaches can be artificially infected with bacteria that cause cholera, pneumonia, diphtheria, gangrene, anthrax and tuberculosis in Asia. Cockroaches can carry a variety of worm eggs, such as roundworm, hookworm, beef tapeworm, roundworm, whipworm and so on.

They can also be used as intermediate hosts of Echinococcus moniliforme, Hymenolepis breviscapus, tumor tube and other nematodes. Cockroaches can also carry a variety of protozoa, four of which are pathogenic to humans or animals, such as Amima dysentery and Giardia enterorrhoea. Experimental studies have confirmed that cockroaches can carry, keep and excrete viruses, including Coxsackie virus and poliovirus. Cockroaches can also carry fungi.

Many kinds of fungi, including a large number of Aspergillus flavus, were isolated from cockroaches caught indoors in Nanjing and Nantong, Jiangsu Province. Although cockroaches carry a variety of pathogens, it is generally believed that pathogens cannot reproduce in their bodies and belong to mechanical transmission media.

However, due to their extensive invasion and miscellaneous eating habits, they can not only move in garbage, toilets, washrooms and other places, but also feed on food, so they can not be ignored in causing intestinal diseases and the spread of parasitic eggs. In addition, cases of allergic reactions caused by cockroach body fluids and feces have also been reported.

furthermore, products from factories, goods in shops and food at home can all cause economic losses due to cockroach biting and fouling. Occasionally, communication equipment, computers and other failures caused by cockroaches have caused accidents. Some people abroad call cockroaches "computer pests".