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Cooperators in the four states (see Acknowledgments) collected wheat samples from which Hessian flies were retrieved.
Yokoyama with ARS at Fresno, California, showed that compressing standard bales, then fumigating them with hydrogen phosphide for 7 days at 68 [degrees] F, kills any Hessian flies that might be hiding inside.
Newly emerged Hessian flies were allowed to oviposit on seedlings in the first leaf stage under cheesecloth tents placed over the flats.
For example, Hessian flies that supposedly came to this country with mercenary troops fighting in the American Revolution ultimately waged war on the U.
They planted their crop after the date in the fall when wheat fields in a given region were generally free of Hessian flies.