Alva Review-Courier -

SALEM, Ore. (AP) — The beginning of spring ushers a flurry of activity on the vast, rolling wheat fields of Umatilla and Morrow counties in northeast Oregon.

Farmers drive large sprayer rigs over still-green plants to control weeds and pests, while crossing their fingers for make-or-break rainstorms that can turn otherwise average yields into a bumper crop.

This year, however, a new layer of uncertainty has emerged for the Northwest wheat industry. Since the U.S. pulled out of the Trans-Pacific Partnership, or TPP, growers are worried about maintaining strong relationships with longtime f...