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Diadegma insulare is a small wasp not more than 6 mm long with reddish-brown legs and abdomen. Egg is rounded, clear and lack projections. The larva of D. insulare is white segmented and bears a short (1/4 of the total length of the larva) narrow "tail". The female has a well-defined ovipositor. Larva is very active (Sourakov and Mitchell 2000).

Adult Diadegma insulare female oviposit one egg per host larva. After 10 to 15 days, the wasp larva emerges from the host cocoon and spins its own cocoon which may have a distinctive white band. Diadegma insulare overwinters within the cocoon as a pupa in crop debris (Sourakov and Mitchell 2000).A good nectar source is very important to increase the longevity of Diadegma insulare female from 2-5 days to more than 20 days (Edward 1997).

Eastern North America, South America, New Hampshire west to southern British Columbia, south to Florida, Texas, southern California, Pacific island including Hawaii, West Indies and Mexico south to Venezuela (Fitton and Walker 1992; Sourakov and Mitchell 2000).