German Cockroach (Blatella germanica)
Adult German cockroaches are about 17mm long and light brown except for the shield behind the head marked with two dark stripes, which run lengthwise on the body. The nymphs are wingless and nearly black with a single light stripe running down the middle of the back. Egg capsules are light tan.
Egg cases are carried by the female until just before hatching and each female may produce four to six cases during her lifetime, each containing 30 to 40 eggs. Eggs hatch in 28 to 30 days, and nymphs develop in 40 to 125 days. Female cockroaches live about 200 days (slightly longer than the male). The German cockroach produces more eggs and has more generations per year (three to four) than any other cockroach, and only a few individuals are needed to develop into troublesome infestations.
An integrated approach involving the use of cockroach traps, insecticidal gels and well targeted use of residual insecticides where appropriate is recommended. Night time inspections may be necessary in difficult to control infestation situations.