The larvae morphology and bionomics of dryinid wasps， Dryinus latus
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Key Words：Dryinus latus, Sivaloka damnosus, parasitism, life history, habits
Abstract： The dryinid wasp Dryinus latus Olmi parastitizes on nymphs of Sivaloka damnosus Chou et Lu and takes double effects on controlling pests by virtue of predation and parasitism in Shanghe Country, Shandong Province. The host of D. latus was definitived, and the morphological characters, the life history and larval habits were described for the first time. D. latus has 2 generations per year in Shanghe Country. It overwinters as the 4instar in cocoons. The majority of larvae pupated from late April to early May. Adults of overwinter generation emerged in middle May, and captured S. damnosus larvae as the supply nutrition. Most of adults lay eggs on pale green tissue which was under the wing buds of 3～5instar nymphs of S. damnosus. The development time of the eggs, the larvae from hatching to taking off capsule and the pupae in the first generation were 78.1h, 2095h and16.1d, respectively. The larvae were spinning cocoons in twigs, leaves and fallen leaves, with some twigs and leaves attached to the cocoons. Adults in the first generation had emerged from late July to early August, and larvae in the second generation start to spin cocoons for over-winter in August. The percentage of parasitic was 27.8%～45.7% in the field, and control efficiency was obvious.