424 Agricultural Experiment Station, Ithaca, N. Y. 



III. THE " MISTLETOE DISEASE " OF THE 

 BLACKBERRY. 



During the last fall, we were asked about a curious disease or 

 malformatiou of blackberry canes by a fruit-grower in Delaware, 

 which is known locally as the " mistletoe disease," because of 

 the mistletoe-like bunches of foliage. We asked for specimens, 

 which, upon examination showed the work of a psylla-like insect 



130.— "Mistletoe " of the blackberry. 



known as the " Bramble Flea louse." This disease has long been 

 known in New Jersey, and is also reported from New York. Ft 

 therefore seems to be desirable to mention and illustrate the dis- 

 ease so that our own berry growers may recognize it, if it should 

 invade their plantations. Our Delaware correspondent wi'ites 

 that the disease is " found oti Early Harvest, Erie, Taylor, Min- 

 newaski, and several other blackberries, but not much on the 

 Wilson. I notice it most on neglected patches and on poor 

 land." 



