Insect Pests and Plant Diseases. 



193 



CHERRY. 



A fungus, the spores of which are carried from tree to tree by 



Black-knot, the wind and thus spread the infection is the cause of this 



disease. The same fungus also afifects plums. Cut out and 



burn all knots as soon as discovered. See that the knots are removed from all 



plums and cherry trees in the neighborhood. See Cornell Bulletin 81. 



Produced by the same fungus that causes the brown rot of 

 Brown-rot piunis and peaches. See Cornell Bulletin 98, pp. 409-410. See 

 01 iruit. ^jgQ Geneva Bulletin 98. See page 362. 



^ ^^ ■'^ 



^ 



^^ ■^ 



Fig. 166. 

 Bean an- 

 thracnose. 



Fig. 167. Club-root of cabbage. 



This is a fungous disease in which the leaves become thickly 

 Leaf spot. covered with reddish or brown spots and fall prematurely; 

 badly affected trees winterkill. Often, the dead spots drop out 

 leaving clear-cut holes. Spray with Bordeaux, 5-5-50. Make four applications; 

 first, just before blossoms open: second, when fruit is free from calyx; third, 

 two weeks later ; fourth, two weeks after third. See Michigan Board Agriculture 

 Report 1906, p. 103. 



It attacks leaves at the tip of the growing shoots and is often 

 Powdery serious on nursery stock. The leaves curl and show white 

 mildew. mealy growth of the fungus. Dust heavily with sulfur or spray 



with potassium sulfide, i oz. to 3 gals, water. 



