282 
The Ohio Naturalist. 
[Vol. XIV, No. 6, 
tion of its symptoms. In a later report (1911, p. 18), he speaks 
of spraying experiments in connection with “Project III Rasp¬ 
berry Yellows.” 
He does not clearly distinguish between raspberry “yellows” 
and raspberry cane blight. Interpretation of his results indi¬ 
cates that spraying with Bordeaux mixture controlled both 
diseases—a conclusion which is not in accord with the uniter’s 
experience with raspberry curl. 
Fig. 1. Plants affected with raspberry curl showing the stunted growth 
and bushy appearance. 
Lawrence (1911), assigns various factors as a possible cause 
of raspberry yellows, among them fungi, poor grainage, lack of 
soil fertility etc. A “bacterial disease” of raspberries was re¬ 
ported by Detmers (1891) in Ohio. From the description of the 
disease, the malady is undoubtedly the one under discussion. 
The name “raspberry yellows” has been and is used indiscrim¬ 
inately to cover a multitude of symptoms. In some instances 
in which people have heard that there is such a disease as “rasp¬ 
berry yellows,” a case definitely diagnosed as such, because a 
few yellow leaves happen to be present. The true raspberry curl, or 
“yellows”, has very definite, striking, characteristic symptoms 
and should not be confused with unthriftiness of plants due to 
cultural conditions nor to a drying or blighting of the leaves and 
canes as brought about by raspberry cane blight. 
