200 



Bulletin 252. 



i 



RASPBERRY. 



is very destructive to black raspberries but not often injurious 

 Anthracnose to the red varieties. It is detected by the circular or elliptical, 

 gray, scab-like spots on the canes. Avoid taking young plants 

 from diseased plantations. Remove all old canes and badly diseased new ones as 

 soon as the fruit is gathered. Although spraying vi^ith Bordeaux, 

 5-5-50, will control the malady, it may not be profitable. If 

 spraying seems advisable make the first application when the new 

 canes are 6 to 8 inches high and follow with two more at intervals 

 of 10 to 14 days. See Geneva Bulletin 124. (Fig. 175.) 



This is a destructive disease affecting both red 



Cane-blight and black varieties. Fruiting canes suddenly 



or wilt. wilt and die. It is caused by a fungus wliich 



attacks the cane at some point and kills the bark 



and wood thereby causing the parts above to die. No successful 



method of treatment is known. In making new settings use only 



plants from healthy plantations. Remove the fruiting canes as 



soon as the fruit is gathered. See Geneva Bulletin 226. 



is often serious on black varieties but does not 

 Kea-rust affect red ones. It is the same as red rust of *> 



blackberry. Dig up and destroy affected plants. 

 This is often destructive, particularly to the red 

 Crown gall or varieties. It is detected by the large, irregular 

 root-knot. knots on the roots and at the crown under- 

 ground. It is a contagious disease. Never set 

 plants showing root-knots. Avoid planting on infested land. The 

 same disease occurs on peaches. 



ROSE. 



is one of the conmionest diseases of the rose. 

 Black leaf spotit causes the leaves to fall prematurely. Spray 



with Bordeaux, 5-5-50, beginning as soon as 

 the first spots appear on the leaves. Two or three applications 

 at intervals of ten days will very largely control the disease. 

 Ammoniacal copper carbonate may be used on roses grown under 

 glass. Apply once a week until disease is under control. 



For greenhouses roses, keep the steam pipes 

 Mildew. painted witli a paste made of ec|ual parts lime 



and sulfur mixed up with water. The mildew 

 is a surface-feeding fungus and is killed by the fumes of the sulfur. Out-door 

 roses that become infested with the mildew may be dusted with sulfur or sprayed 

 with a solution of potassium sulfide, i oz. to 3 gallons water. Spray or dust with 

 the sulfur two or three times at intervals of a week or ten days. 



Fig. 175. Kasp- 

 bcrry anthrac- 

 nose. 



Leaf-spot 



STRAWBERRY. 



is the most common and serious fungous disease of the straw- 

 berry. It is also called rust and leaf-blight. The leaves show 

 spots which are, at first, of a deep purple color, but later enlarge 



