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In spring, adult males of the gall wasp Antistrophus rufus L. emerge from inconspicuous galls in stems of their host plant Silphium laciniatum L. and search for sites on stems where females will later emerge. The behavior of males suggests that they use olfaction rather than visual or tactile cues in searching for mates. In an earlier publication, we reported that galls of A. rufus were associated...
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