APPLE GROWING 



soms. Two mixtures have been found to con- 

 trol it, namely, Bordeaux and a weak solution 

 of lime and sulphur. One or other of these 

 should be applied just before the blossoms open, 

 just before they fall, and when necessary two 

 and nine weeks later. 



(2) New York Apple Tree Canker is 

 usually found mainly on the trunks of old trees, 

 but it also affects the smaller branches. Prac- 

 tically every old or uncared for orchard has 

 more or less of this canker, and where It Is 

 not checked it eventually destroys the tree. 

 This fungus is the cause of most of the dead 

 wood found in old orchards. The surface of 

 the canker is black and rough and covered with 

 minute black pimples. It lives over winter and 

 spreads from one branch or tree to another. 

 As it most frequently enters a branch through 

 wounds made in pruning, these should be 

 promptly painted over with a heavy lead and 

 oil paint. All diseased parts should be cut out 

 and removed as soon as observed. The value 

 of spraying for this disease is not definitely 

 known, but it Is seldom very troublesome in well 

 sprayed and well cared for orchards. 



(3) Blight appears on apple trees in three 

 forms, as blossom blight, as twig blight, and as 



106 



