INSECT ATTACKS AND REMEDIES 139 



nursery, shaking the beetles from the foliage 

 during June is to be recommended. 



American Blight or Woolly Aphis (Schizoneura 

 lanigera). This commonly attacks the wild 

 crab and other trees, and in certain instances 

 around London some of the shoots appear 

 quite hoary with the tufts of woolly matter 

 where the colonies of insects are situated. 

 This is particularly the case with forms of the 

 Siberian crab, members of which have of late 

 years been removed from some of the London 

 parks owing to the persistent attacks of the 

 aphis. Spraying with a strong solution of 

 soft soap and paraffin has had good results, but 

 the best way is to cut down and burn badly 

 infested trees, as the insect spreads rapidly to 

 adjoining specimens. It is a pest of orchard 

 trees, and is described in connection with 

 " Fruit Trees and their Enemies." 



The Weymouth pine (Pinus strobus) suffers 

 severely from a species of coccus which of 

 late years has spread with terrible rapidity in 

 almost every part of the country. In certain 

 instances the trees have been so badly infested 

 that whole woods have been cut down and burnt. 



