. Fig. 59. Distribution of corn crop in the United States. (Map prepared in the Office of Parn Management.) Smut caused by Ustilago zeae (Beck.) Ung. Corn smut in general was much more prevalent in I92I than it has teen for some years past. This is not true for all of the states, nor does it seen to be true for any particular region, but many collaborators comment on the fact that an unusually large amount of smut developed. In Rhode Island only a few speci- mens were obtained, all of v^iich were on Golden Batntam. Clinton reports that in Connecticut there was about the usual amount, and that
. Fig. 59. Distribution of corn crop in the United States. (Map prepared in the Office of Parn Management.) Smut caused by Ustilago zeae (Beck.) Ung. Corn smut in general was much more prevalent in I92I than it has teen for some years past. This is not true for all of the states, nor does it seen to be true for any particular region, but many collaborators comment on the fact that an unusually large amount of smut developed. In Rhode Island only a few speci- mens were obtained, all of v^iich were on Golden Batntam. Clinton reports that in Connecticut there was about the usual amount, and that in Dr. Jones' breeding plots certain strains v;ere quite resistant ani others susceptible, and that these characters seemed to be inherited. Eolley calls attention to the fact that the smut was quite common in certain fields in North Dakota, in a region which is rather new to corn, and suggests that either the spores must be carried long distances by the wind or the crop is infected by the use of diseased seed. V/ind distribution probably easily could account for tJie appearance of the disease in new regions since large numbers of smut spores v/ere caught at elevations of several thousand feet in the air, ani since they are known to retain their via- bility for a long time. The greatest reduction in yield due to smut was reported from North Carolina where it was estimated as 2QfJi. Ivans estimates the reduction in yield in corn for South Dakota due to snut as V^o ard cwnments as follows: "Corn smut very bad. Never saw it worse. I.'any farmers declare it has ruined crops. No field free. Evidently excellent weather conditions when air conidia were di str ibuted. " Learn states that in Colorado corn smut is becoming more prevalent each year and that in Lincoln and other counties the county agents report that it is very destructive. In Minnesota the anut unquestionably was much more prevalent ard destructive than it has been for many years, although it is doubtful whether
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