. Diseases of fruit crops in the United States in 1920. Fruit Diseases and pests United States. 13 Blotch caused by Phyllosticta tsolitaria & Apple blotch has not teen reported from any •additional states during the past year. It is still confined to the ragion south of the 42nd parallel and east of the 100th Meridian, as pointed out in Plant Disease Bulletin Supplement 9» Hov^ever, the disease is evidently becoming more generally prevalent on the outsI:irts of the heavily inf ested a'rea. It i s more generally distributed along the eastern edge in Virginia and New Jersey and along the
. Diseases of fruit crops in the United States in 1920. Fruit Diseases and pests United States. 13 Blotch caused by Phyllosticta tsolitaria & Apple blotch has not teen reported from any •additional states during the past year. It is still confined to the ragion south of the 42nd parallel and east of the 100th Meridian, as pointed out in Plant Disease Bulletin Supplement 9» Hov^ever, the disease is evidently becoming more generally prevalent on the outsI:irts of the heavily inf ested a'rea. It i s more generally distributed along the eastern edge in Virginia and New Jersey and along the northern edge in Pennsylvania, Ohio, Indiana, Illinois and lov/a, tl:ian formerly. In a former number the .Plant Disease Bulletin (Suppl. ' 9: "^G-^S 1^20) there, was presented a summary of the facts concerning the spread of this disease northward. Since the appear^ice of this summary a special survey was made in northern Illinois to ;ri:^ne the'extent of the northward invasion. Several nev; records were. obtai nsd a,'nd it Vas shown -that the ^disease was well established in isolated orohe^rds we'll, to the north of where it had been previous- ly ot served. In practically every case it was- found to ha-ve established itself on one susceptible variety^,' Nortliwestern Greening, and'.where biotch was found on any other'variety the .initial infection in the orchard could always be traced to-Ilorthwostern-Greening^ .. Pig. 2. Occ-urrcnce of applb . blotch in the United States,- revised to 1^ 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 Anderson, H. W. (Harry Warren), 1885-1971; United States. Plant Disease Survey. [Washington, D. C. ] : Plant Disease Survey, Bureau of Plant Industry, United States Department of Agriculture
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