Resseliella sp Bean stem midge

This undescribed species of Reselliella is a minor pest of field bean and was first reported, in the early 1980s, in eastern England. First-generation adults appear in late May and June. Eggs are then laid in stem lesions, especially on winter-sown beans. The larvae, which gradually change in appearance from translucent whitish to deep orange-red, feed gregariously in rows immediately below the epidermis; they occur mainly from mid-June to mid-July, and their feeding sites typically appear as black patches running up the stem. Fully grown larvae drop to the ground, pupate in the soil and a second generation of midges emerges from mid-July to mid-August. The fungus Fusarium is associated with the larval feeding sites and, where significant fungal growth develops, infested plants may become lodged. First-brood larvae are associated mainly with winter beans, as spring-sown bean plants have relatively few stem lesions when egg-laying females of the first generation are active.

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