. Bulletin. Natural history; Natural history. 78 Illinois Natural History Survey Bulletin of norma! proportions, stem rust is shown to have reduced the stature per cent in 1922, not at all in 11J23, .6 per cent in 1924, .2 per cent in 1925, and per cent in 1926; the normal leaf complement is re- duced 5 per cent by the combined attacks of leaf rust and stripe in 1922, 5 per cent in 1923, per cent in 1924, per cent in 1935, and per cent in 1926 ; and the heads are reduced per cent by loose smut in 1923, per cent in 1924, per cent in 1925, and per cent
. Bulletin. Natural history; Natural history. 78 Illinois Natural History Survey Bulletin of norma! proportions, stem rust is shown to have reduced the stature per cent in 1922, not at all in 11J23, .6 per cent in 1924, .2 per cent in 1925, and per cent in 1926; the normal leaf complement is re- duced 5 per cent by the combined attacks of leaf rust and stripe in 1922, 5 per cent in 1923, per cent in 1924, per cent in 1935, and per cent in 1926 ; and the heads are reduced per cent by loose smut in 1923, per cent in 1924, per cent in 1925, and per cent in 1926. The destructiveness effect of rye diseases is illustrated in Figure 92. In comparison with an undiseased stem of average proportions, the dia- gram illustrating the disease injury of 1922 has per cent less stem and per cent less foliage; for 1923 the stem is normal and the foliage per cent smaller for 1924 the amoimt of stem of per cent less, and the foliage 2 per cent less; for 1925 the stem is normal, the foliage .9 per cent less; and for 1936 the stem is normal but the foliage is per cent less. In every season, the heads are drawn at normal size, as the data accumulated for head smut, scab and ergot showed no appreci- able general reductions from their attack. No similar depiction can be given of the effect of smut and rust on corn, for no satisfactory method of estimating their destructiveness has been i Fig. 92. Destructiveness of rye diseases, 1922-1926 The effect of disease attack upon the stems, leaves, and panicles of rye, as indicated by the indexes of destructiveness given in the text, is shown in com- parison with an average healthy Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinoi
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