-9- 



In the fall of 1952 I had the pleasure of a visit with Mr, Adams at his 

 home m Salem, Oregon, Among, the many interesting things which he showed ne on his 

 fam was an Evergreen blackberry vine which extended for a distance of sixty feet 

 and supplied five families vath all of the blackberries that they wanted. A year 

 ago Mr, Adajns sent several shoots from that vine to the Pomology Department. They 

 were planted and have survived this past winter. 



The Evergreen variety is one that is grown extensively in Oregon. Perhaps 

 it has a place in Massachusetts, Only the future will tell, 



— — 0,C ,Roberts 

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KEEPDIG STRAWBERRY PLANTS FREE FROM INFECTION 



Almost all strawberry plants growing in the northeast ^re infected vfith one 

 or more virus diseases. It is very likely that vjlld 'strej'rberries als a -are- infected* 



Three species of aphids, known to occur in the northeast, serve as virus 

 carriers,' After feeding upon diseased plants these a^i ids may transmit the viruses 

 to healthy, virus.<Cree strawberries. Certain other aphids, also found on straw- 

 berries occasionally, have transmitted viruses experimentally. 



Virus-free strawberry plants grown only for friiting the next season, and next 

 season only, do not require protection from aphids. Viruses contracted by these 

 plants through apliid feeding should have little or no effect upon their growth or 

 yield. 



Plants grown in nurseries for subsequent sale , planting and fruiting the 

 year after planting must be protected from aphids' in tne nursery to keep them in a 

 virus-free condition. This becomes even more important in stock beds from which 

 the nurseryman will set his new stock beds and plant beds for succeeding seasons. 



Virus-carrying aphids must not feed on plants which the nurseryman desires 

 to keep virus-free . 



How Aphids Move From Field to Field 



Winged forms are produced in some generations of most aphid species. In 

 strawberry aphids, only the winged forms are able to move from one plant bed to an- 

 other, (An exception would be the movement of plants, infested with wingless forms, 

 from place to place,) 



The Problem 



Our problem then is to (l) prevent winged aphids from developing on virus- 

 infected plants or on plants which may have virus in them, and (2) to prevent any 

 winged aphids that do develop on such plants from establishing colonies or even 

 feeding upon o\ir virus-free plantings, 



VvTiat the Nurseryman Can Do I 



Winged aphids do not travel great distances imless carried by wind or by some other 

 means J therefore: 



