New Yokk Agbicultueal Expeeiment Station. 333 



together with notes* and a paper^ by the writer, and a poster 

 bulletin,^' ip the extent of the bibliography on the subject. 



IlSrVESTIGATIONS 11^ 1898. 



In the spring of 1898 the Chapin Brothers, of East Bloomfield, 

 I»r. Y., requested the Experiment Station authorities to investigate 

 the cause of the dying of trees in their orchard. Prof. Beach 

 visited the orchard and saw at once that a canker was the cause of 

 the trouble, the serious nature of which was plainly evident in the 

 numerous dead and dving trees. The writer was detailed to work 

 on the subject, and the history of the investigations, extending 

 through two seasons, is herewith presented. 



The orchard in question originally consisted of one hundred 

 and twenty-five acres. The trees on thirty of the eighty acres in 

 one part were ruined by the canker and have been taken out, and 

 the trees on one-half of the remaining fifty acres are now of little 

 value. In the other part of the orchard originally consisting of 

 forty-five acres, only about ten acres are left that are of much 

 value. The owners have noticed the disease for the past six or 

 eight years, but it has increased very rapidly in the last three or 

 four years. They have also found that it shows a decided prefer- 

 ence for certain varieties, the Twenty Ounce being the most sus- 

 ceptible; then the Baldwin, Wagener, Greening and King follow 

 in the order named. The Tallman Sweet appears to be practi- 

 cally free from the disease. Trees growing in low land or in any 

 situation where the ground was at all wet, were found to suffer 



4 Paddock. Science, 8 : 596. An Apple Canker. Brief account of investiga- 

 tions, and concludes that the disease is probably caused by the fungus 

 Sphcnropsis malorum, Pk. 



P. 836. Additional Notes on an Apple Canker. Notes the occurrence 



of a Sphceropsis on pear and quince trees, and as causing a twig blight of 

 apple trees. 



5 Paddock. Proceedings of the Western N. Y. Hort. Soc, 1899, pp. 58-64. 

 An Apple Canker. Popular account of investigations with the disease. 



6 Vermont Special Bulletin, April, 1899, gives illustrations of cankered 

 apple-tree limbs. 



