No matter where we go, cockroaches seem to lurke around in every household we live in. Those who have lived in northern and southern China may notice the marked differences between roaches in these areas.

American cockroaches are typically found in southern China. The average length of the American cockroach is two-to-three centimeters. These roaches prefer to nest in warm and humid environments. In contrast, German cockroaches in northern China are much smaller and able to survive the cold weather.

Despite their difference in size, they have equally developed resistance to insecticides, leading to population growth.

A study by Purdue University shows the German cockroach population became resistant to insecticides within months, resisting chemicals they were not yet exposed to.

Commonly foud around unsanitary areas, these pests often carry bacteria that may harm to people's health. The insect's feces and discarted body parts may cause allergic reactions and even asthma.

So how can we conquer these armies of invaders? Here are some possible solutions:

1.      Use only one type of insecticide spray instead of multiple sprays at once;

2.      Resort to other chemical-free alternatives ones such as traps and vacuuming;

3.      Sanitize surfaces in your home, especially cracks, holes, and behind the refrigerator;

4.      Keep your house cool and dry;

5.      If theres severe infestation, get professional help from pest control.

(Cover image via VCG)

(If you want to contribute and have specific expertise, please contact us at nature@cgtn.com.)