Abstract
The sugar maple cambium miner, Phytobia setosa (Loew), forms elongate serpentine mines in the cambium of living sugar maple and red maple. The mines appear as brown streaks in lathe-turned veneer. P. setosa damage has been found in 7 States, the District of Columbia, and in the province of Quebec, Canada. Adults emerge in the first week of May and the females lay their eggs singly on 1-year-old twigs. The larvae have 3 instars, mining from mid-May until late July. The larvae leave the host via the primary roots to pupate beginning early July and overwinter as puparia. The solitary parasite Symphya agromyzae Rohwer was reared from a puparium of P. setosa and is the first record of this parasite from Wisconsin.
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