. The commercial apple industry of North America. be avoided in regionswhere blister-canker is serious. Preventive measures maybe summed up as follows: (1) Avoid heavy pruning;(2) disinfect and paint all wounds; (3) remove all infec-tions from diseased trees; (4) select resistant varieties;(5) keep trees vigorous. Collar-rot. The seriousness of collar-rot has become apparent inmany commercial apple orchards and the cause of thisinjury has been the subject of considerable study. Cer-tain varieties such as Grimes, the trunk wood of whichdoes not harden fully for the winter and which for thatreas
. The commercial apple industry of North America. be avoided in regionswhere blister-canker is serious. Preventive measures maybe summed up as follows: (1) Avoid heavy pruning;(2) disinfect and paint all wounds; (3) remove all infec-tions from diseased trees; (4) select resistant varieties;(5) keep trees vigorous. Collar-rot. The seriousness of collar-rot has become apparent inmany commercial apple orchards and the cause of thisinjury has been the subject of considerable study. Cer-tain varieties such as Grimes, the trunk wood of whichdoes not harden fully for the winter and which for thatreason is more subject to injuries from alternate freezingand thawing, seem more susceptible to collar-rot thanothers. Collar-rot on Grimes is also sometimes attributedto fire-blight. The connection of certain fungi have beenassociated with collar-rot injury, but at the present timethere is no authentic publication which describes the iso-lation of any particular fungus responsible for the injuryfor which specified treatment is recommended. Trees in.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921
