关键词: 德国小蠊, 卵鞘, 若虫, 成虫

Abstract: The life cycle of Blattella germanica was fully observed under the normalized condition. The Ootheca is long and reveeal ellipsis in shape attached in the end of the abdominal region of the female. It is dropped after after the nymph is hatched. The first Otheca can averagely hatch 40.20 nymphs. The rate of the egg incbuation is 95.17%. The Ootheca incubation is 97.41%, The nymph decarticates five times and can hatch for six times. The growing time is 37.56 days. The survival rate is 55.98%. The proportion of sex namely female to male was 1:0.811. One female produces 4-10 oothecas, 6.86 in average. After the fifth the Ootheca produces less nymphs gradually. The female can live for 203.89 days, and the male can live for 157.82 days in average. If a single female and asingle male are starved, they can only live 14.29 days and 8.50 day, The duration of life eycle is 62.61 days. and they can reproduce more than five generations in a year. The reproduction of a pair of adult is 1000 billion.