9 - 



able when whole apples are examined, since most of the cells would 

 therefore be healthy. Nevertheless, from a practical viewpoint, 

 it appears that even when these viruses are known to exist in an 

 orchard, fruit quality can be expected to be similar whether or 

 not they come from affected trees. However, it must be emphasized 

 that yield may be drastically reduced by these viruses. Yield re- 

 ductions of from 12% to 55% on trees affected with apple mosaic 

 virus have been measured. Therefore, growers should certainly not 

 conclude from this study that viruses are not important concerns. 

 They are causes for a great deal of concern! 



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



FRUIT NOTES INDEX FOR 1973 



(This index of major articles has been prepared for those who keep 

 a file of Fruit Notes . . The number in parentheses indicate the 

 pages on which the item appears.) 



January-February 



Recent Tree Fruit Variety Introductions (1-5) 

 San Jose Scale - Life History and Control (6-7) 

 Recent Small Fruit Introductions (7-9) 



The Influence of Shade and Within-Tree Position on Apple 

 Fruit Size, Color and Storage Quality (8-10) 



in 1973 (1-4) 

 Delicious' 



March-Apri 1 



Suggestions for Fertilization of Apple Trees 

 Influence of Potassium on Calcium Uptake of 



Apples (4-5) 

 Controlling Weeds in Strawberries (6-7) 

 Mummy Berry (7-8) 

 Use of Ethephon (Ethrel*) to Initiate Flower Bud Develop 



ment (8-9) 



May- June 



July-August 



Preliminary Suggestions for the Use of Ethephon (Ethrel*) on 

 'Mcintosh' Apple Trees (1-3) 

 Summer Care of Fruit Trees (3-5) 

 1972 Blueberry Survey (6-7) 

 Storing Blueberry Netting (7-8) 



