Abstract
The results secured from the use of the new chemical calcium cyanide for destroying chinch bugs at wheat harvest are given. Calcium cyanide did not prove practical when sown broadcast in infested wheat fields or when applied as a line barrier on the surface of the ground. In tests where it was applied in a narrow strip or trap crop between wheat and com fields, it proved promising. However, best results were secured when the material was distributed in a narrow line in the bottom of a deep narrow furrow such as made with a plow. The furrow should have practically a vertical wall next to the crop to be protected and a line of the chemical placed at the foot of the vertical wall. One pound of calcium cyanide flakes to each sixty linear feet of furrow applied in the afternoon when heavy migration of bugs began, proved effective in destroying the bugs for the rest of the day. This requires about 22 pounds, costing four dollars a day for material used in a quarter of a mile of barrier.
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