A Study on the Morphology and Bionomics of Predatory Bug Agriosphodrus dohrni(Signoret)

Laboratory rearing and simulated field overwintering of Agriosphodrus dohrni were conducted in bothe Dayi County,Sichuan Province and Beijing in l993～1994.It has one generation a year and overwinters in the 5th instar in nymphal stage. The eggs aggregate in the form of egg masses and hatch in 27.08±1.00 days after oviposition. There are altogether 5 instars in nymphal stage and its development lasts for 334.75±4.30 days. The adults mate in 16～18 days after emergence and oviposit 18～19 days later. Not only its morphology and changes in color after moulting in all stages but also the bionomics were described.Experiments both in the laboratory and in the field showed that it is a promisingpredator and can prey on Lymantria dispar,Clostera anachoreta,Apocheima cinerarius, Pristiphora beijingensis,Stilpnotia salicis,Aphis robiniae etc. and many other species of forestpests.