Diseases of cereal and forage Diseases of cereal and forage crops in the United States in 1921 diseasesofcereal21stak Year: 1922 224 CORN - Smut Fig. Go. Occurrenoe of and percentage losses from smut (upper figures) and rust (lower figures) of corn, I92I. corrriented on the fact that in many fields as high as /T''/'' plants were affected. The sriiut v;as so prevalent that fields appeared to te spotted v/ith black v/hen viev/ed from a railroad car v;indow. (For losses and distribution see Fig. 60.) There are differences in varietal susceptibility; even soire farmers reported that they had
Diseases of cereal and forage Diseases of cereal and forage crops in the United States in 1921 diseasesofcereal21stak Year: 1922 224 CORN - Smut Fig. Go. Occurrenoe of and percentage losses from smut (upper figures) and rust (lower figures) of corn, I92I. corrriented on the fact that in many fields as high as /T''/'' plants were affected. The sriiut v;as so prevalent that fields appeared to te spotted v/ith black v/hen viev/ed from a railroad car v;indow. (For losses and distribution see Fig. 60.) There are differences in varietal susceptibility; even soire farmers reported that they had observed differences. Cooperative experiments betv/een the plant breeding and plant patholog/ departments at the University of Minnesota have been carried on for several years and it has been definitely established in corroboration of Jones' results at Connecticut, that there are differences in varietal susceptibility, and it seemis that it v/ill be quite possible to produce smt resistant varieties. Just v>hy the smut was so miuch miore prevalent in many states this year than for several years past, cannot be explained easily. It would seem that in many localities the v/eather conditions were unfavorable for the development of the disease. However, this can scarcely have been true, since the fact of the unusual prevalence of the disease is unquestioned. Rust caused by Puccinia sorghi Schw. The rust of corn was very generally distributed. It was reported from most of the states in v;hich corn is grown - from Rhode Island to California, and from. Minnesota to Louisiana. It probably v/as almost universally present, although in the aggregate it causes very little injury. Browning states that in Rliode Island there was much less rust than there was last year but that there was a rather high percentage on Evergreen Bantam. Other• varieties, ac- cording to Browning, were almost free from the disease. Neal states that in
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