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 



'?<-•'» ^jb-kA, 



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. It 

 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 writes 

 that the disease is " found on 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." 



