These insects have the behavior of running away if they are exposed to light. Notably, they have the behavior of leaving chemical trails in their feces which help other cockroaches to discover the sources of water and food, and also discover where the other cockroaches are hiding. Also, they emit airborne pheromones which assist them in mating and swarming.
However, these insects can invade your home in search of food and water. If they invade your home, they are therefore considered as pests. In addition, they may cause damage in your home if they invade in large numbers.
Notably, you may experience feeding damage if these pests invades your home since they like starch and all your starchy items such as meat products and cereals will be chewed. If your home is invaded by the German cockroach, then all your books and their bindings will be destroyed since they like feeding on them. Also, the larger roaches can chew on your paper products hence leading to damage of the products. In addition, your food may be contaminated by the fecal material from their feeding. Therefore, it is advisable to take the necessary control measures so as to avoid food contamination and the staining of other products.
Also, roaches may cause damage in your home because they transmit numerous diseases. They produce odorous secretions that can affect the flavor of various foods and also lead to the transmission of diseases. They have disease-causing organisms such as viruses, protozoa, and bacteria that are carried on their bodies and legs which they deposit on utensils and foods.