A preliminary report of observations on Dicladispa armigera similis (Uhmann).
The biology and ecology of the chrysomelid Dicladispa armigera similis [D. armigera] was studied in the field in Puding County, China, in 1981. The morphological characters of its nymphs, and the variation of nymphal colour are described. Generally the adults moulted between 06.00 and 08.00 h. Mating took place mostly during the day, and the eggs were laid separately in the mesophyll of tender rice leaves at night. Rice was the main host, but the pest also fed on wheat, Leersia hexandra, Echinochloa crus-galli and Eleocharis equisetina before the emergence of rice seedlings. The adults overwintered in holes in the soil, under rice straw or among the roots of weeds. There were 2 generations a year at Puding County at an altitude of 1220 m.