. Bulletin. Natural history; Natural history. 482 Natikal SruvKY Bulletin to a very low point. The average incidence of diseases per tree attained the high point, , In 1928 bacterial shot-hole was the only disease exhibiting a high degree of prevalence. Brown-rot fell off markedly, and so also did leaf- curl, while seal) remained at essentially the level of the year before. Consequeatly, the average incidence of disease per tree fell to , the lowest point in our record with the exception of the incomplete 1925. The trends of prevalence for each of the peach diseases a
. Bulletin. Natural history; Natural history. 482 Natikal SruvKY Bulletin to a very low point. The average incidence of diseases per tree attained the high point, , In 1928 bacterial shot-hole was the only disease exhibiting a high degree of prevalence. Brown-rot fell off markedly, and so also did leaf- curl, while seal) remained at essentially the level of the year before. Consequeatly, the average incidence of disease per tree fell to , the lowest point in our record with the exception of the incomplete 1925. The trends of prevalence for each of the peach diseases are shown in the lower ])art of Figure 22, and the trend from year to year of the average incid(Mice of diseases is shown in the upper part. From 1922 to. Fig. 22. Comparison of the prevalence trends of peach diseases The lower part of the figure gives the trends for each disease and the upper part the trend of average annual incidence of disease per tree. The break in the lower part is necessary to show the great drop in brown-rot prevalence in 1925. Data for 1925 are lacking for leaf-curl and scab. 1923 the trends of leaf-curl and scab moved upward, but this was counterbalanced by a downward movement by brown-rot and shot-hole, with the result that the level of average incidence was scarcely changed. The upward movement of scab was continued into 1924, and brown-rot and shot-hole both reversed their downward trends, as did. 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 Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
