Abstract
A study was made to determine whether flight plays a significant role in the dispersion of the clover root curculio ( Sitona hispidula (F.)), and to ascertain at what season and under what conditions flying, if any, takes place. Two devices for trapping flying weevils were used in red clover fields. One, employed at Forest Grove, Oregon, consisted of a pair of insect nets mounted on the ends of a horizontal bar rotated by a gasoline motor. The other, used at University Park, Pennsylvania, was a 4 × 16-foot sticky trap treated on both sides. The timing of weevil catches by both of these devices, operating in widely separated geographical areas, indicated that the overwintered weevils do not fly but that the new-generation weevils have a definite flight period occurring from the latter part of August to about the third week of October. Most flying occurred during warm intervals when temperatures were 80°F. or above.
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