Roaches are one of the most loathsome and widespread of all pests. Their presence connotes filth and disease. Roaches infestations are difficult to eradicate. While in the home they spread bacteria, diseases and cause allergies. Scientists have shown that greater numbers of asthma cases are reported in areas where there are large roach infestations. Roaches like to breed in hard to reach dark crevices. They spread filth and contaminate food.