. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). iSi JBULLETIN 236. cially devoted. Although this particular kind of cankered spots on apple trees was probably first observed by horticultural writers as early as 1780^^ and has been repeatedly referred to in horticultural writings since that time, its true nature does not seem to have been suspected until 1880. In that year Professor T. J. Burrill, of the Illinois State Experiment Station, while working on the fire blight of pears and apples, came to th
. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). iSi JBULLETIN 236. cially devoted. Although this particular kind of cankered spots on apple trees was probably first observed by horticultural writers as early as 1780^^ and has been repeatedly referred to in horticultural writings since that time, its true nature does not seem to have been suspected until 1880. In that year Professor T. J. Burrill, of the Illinois State Experiment Station, while working on the fire blight of pears and apples, came to the conclu- sion that the so-called " sun scald" spots on the bodies and larger limbs of apple trees are due to the same cause. At a meeting of the Illinois State Hor- ticultural Society in 1881^ in answer to a query regarding the nature of " sun scald," he said : " The sun scald on apple tree is the same as pear ; Similar statements of Pro- fessor Burrill upon the same sub- ject are recorded in other places.^ Upon what experimental evidence, if any, this and other statements^ were based I have so far failed to discover. A number of writers^ since that time have referred to these cankered patches as "body blight" due to attacks of Bacillus amylovorous,^'^ but none seem to have actually produced the cankers by the introduction of the bacteria into the bark of healthy trees.^^. Fig 49.— Typical blight canker on main limb of young tree. 2. The Distinguishing Characters and Appearance of the Canker The blight canker (Fig. 49), while it may occur on trees of almost any age, is most destructive on young trees just coming into bearing, trees from 8 to 15 years old. In some sections of this State, notably the Upper Hudson River valley, at least 95 per cent of the trees of this age show canker on limbs or body. A very large percentage of the affected trees are dead and the remainder are fast succumbing. \^ery noticeable throughout this sect
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