INVESTIGATIONS ON THE GOUT FLY (CHLOROPS PUMILIONIS BJERK.) IN DEVON AND CORNWALL

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Abstract
Field observations from 1943 to 1946 on attacks by gout fly on wheat in south‐west England show that there are two generations of the fly during the year, the first emerging in May from October‐laid eggs and the second emerging in late July and early August. The first generation severely damages spring wheat and may also attack very late sown and backward autumn wheat; wheat not above ground before 20 October escapes attack by the second generation. In south‐west England, the optimum period for drilling wheat to escape gout‐fly damage is mid‐October. In this area, both generations of gout fly show a marked preference for wheat; attacks on barley are negligible.
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