The Control of Insect Pests and Plant Diseases. 6ir 



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 which 



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. Geneva Bulletin 226. 



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 underground. 



It is a contagious disease. Never set plants 



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



disease occurs on peaches. 



Red-rust is often serious on black varieties, but 



Red-rust. does not affect red ones. It is the same as red rust 



of blackberry. Dig up and destroy infected plants. 



ROSE. 



This is one of the commonest diseases of the rose. 

 Black leaf spot. It 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 carlionate may be used on roses gro\vn under 

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



For greenhouse roses, keep the steam pipes painted 

 Mildew. with a paste made of equal parts lime and sulfur 



mixed with water. The mildew is a surface feed- 

 ing 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 sulfid, i oz. to 3 gallons Fig. 221. — 

 water. Spray or dust with the sulfur two or three times at inter- Ras pberry 

 vals of a week or ten days. anthracnose. 



F^--^,' 



m 



STRAWBERRY. 



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

 Leaf-Spot 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 

 and the center becomes gray or nearly white. The fungus passes the winter in the 

 old diseased leaves that fall to the ground. In setting new plantations, remove 

 all diseased leaves from the plants before they are taken to the field. Soon 

 after growth begins, spray the uewly set plants with Bordeaux, 5-5-50. Make 

 three or four additional sprayings during the season. The following spring, spray 

 just before blossoming and again 10 to 14 days later. If the bed is to be fruited 

 a second time, mow the plants and bum over the beds as soon as the fruit is gath- 

 ered. Plant resistant varieties. Cornell Bulletin 79. 



