286 
The Ohio Naturalist. 
[Vol.XIV, No. 6, 
uneven expansion of tissues which brings about the rcvolutely 
curled condition of the diseased foliage. During the summer 
months the foliage may acquire a mottled appearance, at first a 
light yellow, gradually changing to darker shades of green and 
yellow and eventually transforming into a reddish-bronze hue. 
See fig. 4. The severity of curl and variations and intensities of 
color depend very greatly upon soil and climatic conditions. An 
abundance of rain is unfavorable to the development of the above 
symptoms, while hot and dry weather produce the more con¬ 
spicuous cases. All diseased foliage, besides being curled and mot¬ 
tled, is considerably smaller and never attains its natural size. 
See fig. 3. In September or October it is not uncommon to find 
Fig. 5. Two-year-old healthy Cuthbert raspberry plants. 
considerable mottled foliage; the spots may vary from a yellowish 
tinge to a bronze, in many cases not unlike mosaic disease in their 
color, size, shape and location with reference to the vascular 
system. See fig. 4. 
The berries mature from ten days to two weeks earlier than the 
normal crop. They are small, often deformed, lighter in color 
than the normal berry, and when apparently ripe are bitter, later 
becoming insipid. If allowed to remain on the cane until they 
become “dead ripe”, they acquire a slight flavor, which is, however, 
far from pleasant. In fact the berries are so small and poor in 
quality that berry pickers refuse to pick at the customary price 
per quart and commission men will not handle the fruit on ac¬ 
count of its inferior qualities. 
