Market underpinned by excessive rains in the southern Plains and Midwest that threaten winter wheat yields and production. U.S. spring wheat crop was 90 percent planted. CBOT July soft red winter wheat was last down 1/2 cent at $4.33-3/4 per bushel, K.C. July hard red winter wheat last down 3 cents at $4.33 and MGEX July spring wheat last down 2-1/2 cents at $5.56-3/4.