INSECTS AND DISEASES 



blight cankers. It is a bacterial disease which 

 is distributed by flies, bees, birds, etc., and can- 

 not be controlled by spraying. The bacteria 

 are carried over the winter cankers on the 

 main limbs and bodies of the trees, oozing 

 out in a sticky mass in the spring. These 

 cankers should be cut out with a sharp knife 

 cutting well into the healthy bark and then 

 washing the wound with corrosive sublimate, 

 one part to one thousand of water. Cut- 

 ting out and destroying are also the chief 

 remedies to be used when the blight appears 

 in the twigs and blossoms. It is not usually 

 as serious on apples as on pears. Some varie- 

 ties, like Alexander, are more subject to it than 

 others. 



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