Cockroaches have three distinct live stages: the egg, several nymphal stages and the adult. Feritilized adult females produce small bean-like capsules that contain a number of eggs. Capules may be dropped or glued to surfaces by the female. Nymphs that emerge from the eggs resemble the adult cockroaches but are smaller and have undeveloped rudimentary wings. Several nymphal stages my occur as the cockroach molts and finally reaches the adult stage. The life cycle my require 3 months to 3 years, depending on the species an enviromental conditions
The German cockroach is the most common in Texas. This light brown roach is marked with two dark stripes that run lenghtwise on the head and thorax. Adult males and females are windged but rarely fly and are about 1/2 inch in length. German roaches thrive in all types of buildings and often are found in kitchens in home and commericial food establishments. They are the most prolific in the numer of offspring they produce. The female carries her egg capsule unitl just before the nymphs hatch.
The American cockroach is the largest of the common house-infesting cockroaches. The American roach is reddish brown with a light yellow band around the edge of the prothorax or head sheild. In adults, which fly occasionally, the wings cover the entire abdomen. They are 1 to 1 1/2 inches long and perfer warm, damp, dark areas such as sewers. American cockroaches are found in alleyways, lawns, shade trees, and other high organic matter situations. Homes, commercial food establishments an dother buildings that provide favorable shelters and ample food are infested frequently.
The Brown-banded cockroach is light gold to glossy brown in color. It is similar in size and outline to the German cockroach. Transverse yellow bands cross the base of the wings and the abdomen. In adults, which fly occasionally, the wings cover the body. The female’s wings are short. Females glue their egg capsules to surfaces. Nymphal brown-banded roaches have a pronounced yellow band across their backs. Brown-banded roaches prefer starchy foods and have a low water requirement. They are usually found scattered thoughtout homes, apartments, hotels, and hospitals.
The Oriental cockroaches are glossy dark brown to black. Wings of the adult male cover one half to three fourths of the abomen, while the female has redimentary wings which are reduced to mere lobes. Neither sex can fly. Nymphs and adults are found around decaying organic matter. Lawns, compost piles, sewers, flower beds, and dumps are favorable habitats for the oriental cockroach. During drought conditions and cool weather this roach may move into homes and other buildings in large numbers.
Smoky Brown Cockroach
The Smoky brown cockroach is very dark brown in color. Adults are about 3/4 to 1 inch long, have long wings and are good fliers. Smoky brown roaches prefer and outdoor habitat, but seasonal migration my bring them indoors.