Scaptomyza flava Fallen

Whitish, usually blotch-like, leaf mines formed by larvae of this often abundant species occur on various members of the Brassicaceae, including oilseed rape and vegetable crops such as broccoli, Brussels sprout, cauliflower and radish. In severe cases, infested leaves are killed but any effect on plant growth is usually of little or no significance.

BIOLOGY

Adults occur from April onwards and there are several overlapping generations each year. The larvae feed within the lamina of expanded leaves to form blotch mines or irregular, often branched galleries, which frequently follow the major veins (Plate 8a). The frass deposited by this species is frequently placed within side galleries; this keeps the main feeding area frass-free. Fully fed larvae pupate externally within the mine (Plate 8b) or on the ground and adults emerge shortly afterwards.

DESCRIPTION

Adult 2.5-3.0mm long, pale yellow, with grey markings and bright red eyes. Larva up to 4mm long, white, translucent and elongate; anterior spiracles prominent; posterior spiracles borne on short but prominent, pointed processes (cf. cabbage leaf miner, Phytomyza rufipes, p. 192). Puparium 3.0-3.5 mm long, elongate, reddish-brown; anterior spiracles horn-like

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