New YorK AGRICULTURAL EXPERIMENT STATION. 185 
/ Cayp Knot.—We have sought for Bailey’s® cane knot of 
blackberry but have not found it. Among wild blackberries we 
have found cane knots caused by an insect. A few inches above 
the ground the canes bore swellings from one to two inches in 
length and having a diameter about one-half greater than nor- 
mal. The swellings were mostly smooth but some were cracked 
owing to the canes having broken over at that point; and a few 
specimens collected at Barker showed eruptions of soft, spongy 
tissue. Inside the swellings there were the whitish larve of 
the gouty gall-beetle, Agrilus ruficollis, These larvee were boring 
in the pith. In many cases they had also girdled the cane by 
boring around it just under the bark. Undoubtedly, the larve 
were the cause of the swellings. These observations were made 
in May. | 
On the Station grounds we have observed enlargements on 
blackberry canes near the ground which were due to mechanical 
injuries made by tools used in cultivation. 
OtHpR Disrases.—At Portland a powdery mildew was ob- 
served on 4 few canes of the variety Snyder. It was probably 
the same fungus as that found on black raspberries (see page 
208). As in the case of the raspberry, only rusted plants were 
attacked. 
Anthracnose, Gleosporium venetum, has done very little dam- 
age to blackberries. 
Crown gall or root knot occasionally attacks blackberries, but 
is rarely destructive to them. 
CHERRY DISEASES. 
Frurr Ror (Monilia fructigena P.).—On account of the ex- 
tremely dry season the loss from fruit rot has been much less 
than usual. A few correspondents report losses of 15 to 20 per 
ct. | 
Buack Knor (Plowrightia morbosa (Schw.) Sace.).—Black knot 
attacks sour cherries in Western New York, but is easily kept 

*Bailey, L. H. Blackberries. Cornell Univ. Agr, Exp. Sta. Bul... 993 
427-428. Illus. 
