. Percentages of smut . , . in crop . Seed lot B Seed lot A 1 55-4 . 5^.7 79'7 Seed lot B 2,8 5-4 Stem rust caused by Puccinia graminis Pers. Stem rust of,, o^ts. occurred over, a ^ge ,in I919 as previous years. In a number of states, notably Minnesota, the Dakotas, and Nebraska, the disease caused considerable losses,whi le in many others the .losses from this disease on oats was negligible. On. the accompanying map are'indicated the ocairrence and estimated percentages of reduction in yield in the v
. Percentages of smut . , . in crop . Seed lot B Seed lot A 1 55-4 . 5^.7 79'7 Seed lot B 2,8 5-4 Stem rust caused by Puccinia graminis Pers. Stem rust of,, o^ts. occurred over, a ^ge ,in I919 as previous years. In a number of states, notably Minnesota, the Dakotas, and Nebraska, the disease caused considerable losses,whi le in many others the .losses from this disease on oats was negligible. On. the accompanying map are'indicated the ocairrence and estimated percentages of reduction in yield in the various states from which reports have been received. The estiirated losses are sum- marized in bud;iels in Plant Disease Bulletin, Supplement 12,, 192O. 'Aliile' general the percentages are low, it is well known that stem rust is a limiting, factor in the successful culture of oats in Cali- fornia. Hence, the figures on losses in California gre,atly,,underestimate the actual situation, for if the ris t attacks were less severe there, or if suit- able rust resistant varieties were available for culture, a murh greater acre- age cf oats would undoubtedly be grown in .that section. A few years ago the wr,iter (Johnson) learned of certain rather unusual indirect effects of these,severe at'tacks of stem rust on oats in scuthern Cali fornia upon certain pha' of agiucultural practice tliere. In inspecting bar- ley for aiseases south cf Sa'n Diego, especially in the vicinity Chula Vista it was found that barley was grown there chiefly for hay. Upon inquiry it was learned that other more desirable grains,, especially oats were not grown for hay because of the severity of stem rust attacks on those grains, v/.hile it was found by experience that barley'rusted but very . lit tie. The writer's observations as to these point s, espe cia lly as to oats and barley, tended to
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