. Bulletin. Natural history; Natural history. Total Intetibity of Apple Diseasea 1925 :0 1924 1925 1^26 1927 1928' TwLg Leaf_ 2222 2U6 i24 I5D2 2J6 10 aO 50 40 50 60 70 SO 90 100 160 I8t) 190 Fig. 16. Comparison of the total intensity of the annual epidemics of APPLE diseases The total of fruit, twig and leaf intensity shown in the table are combined graphically in the block diagrams to show the relative intensity of all epidemics in each of the years covered by the survey. The tendency of frui
. Bulletin. Natural history; Natural history. Total Intetibity of Apple Diseasea 1925 :0 1924 1925 1^26 1927 1928' TwLg Leaf_ 2222 2U6 i24 I5D2 2J6 10 aO 50 40 50 60 70 SO 90 100 160 I8t) 190 Fig. 16. Comparison of the total intensity of the annual epidemics of APPLE diseases The total of fruit, twig and leaf intensity shown in the table are combined graphically in the block diagrams to show the relative intensity of all epidemics in each of the years covered by the survey. The tendency of fruit, twig, and leaf disease to fluctu&.te independently from one year to another is also shown. destructive disease. It appears also that the two first years, 1922 and 1923, were characterized by a very great severity in disease, but that in 1924, and in the succeeding years, the intensity of disease attack de- creased to moderate or small amounts. The graph also illustrates the proportional effects of each type of attack in each year and shows how an increase in the intensity of one type of attack, even when accompanied by decreases in the intensity of. 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
