3 - 



in mid-summer. Since it has been shown that pear and apple trees 

 require similar levels of magnesium, it was concluded that magnes- 

 ium deficiency was not responsible for the damage to the pear 

 leaves in the orchards sampled. 



Since the cause of the pear leaf scorch has not been resolved, 

 we would appreciate hearing from growers if the disorder is again 

 prevalent in 1971. 



Senior Chemist, West Experiment Station, Univ. of Massachusetts 



*************** 



A NEW BOOK ON APPLES NOW AVAILABLE 



George M. Kessler, Editor 

 Fruit Varieties & Horticultural Digest 

 Department of Horticulture 

 Michigan State University 



A new book entitled "North American Apples: Varieties, Root- 

 stocks, Outlook" which should be of interest to apple growers is 

 now available from the Michigan State University Press, Box 550, 

 East Lansing, Michigan 48823. 



In this book, a number of outstanding pomologists and a free- 

 lance writer have succeeded, through their joint efforts, in bring- 

 ing together many interesting and pertinent facts about the leading 

 apple varieties of North America, their bud sports, certain of the 

 minor and discarded varieties, and the important rootstocks. 



In a chapter entitled "Varieties of Yesteryear", A. P. French 

 gives a brief history and description of a number of old American 

 varieties which have fallen by the wayside or are no longer impor- 

 tant. 



Emery Wilcox provides significant facts and figures, skill- 

 fully tracing apple variety trends in the United States and Canada 

 during the past 27 years. 



The major portion of the book consists of a series of chapters 

 dealing with the seven leading North American apple varieties: 

 Delicious, Mcintosh, Golden Delicious, Rome Beauty, Jonathan, Wine- 

 sap, and York Imperial; and the minor variety. Northern Spy. Each 

 chapter reflects the careful research of each author, namely, 

 Virginia Maas (the freelance writer), R.P. Larsen, W.H. Upshall, 

 J.B. Mowry, and E.S. Degman. Fascinating episodes connected with 

 the origin of each variety are revealed. Valuable lists of strains 



