14 



A Bulletin on Orchard Practice 



WOOLLY APHIS. 



This insect is rarely found anywhere except on apple trees. 

 It is most common in the Coast Region, though in other sec- 

 tions it is sometimes quite numerous. The white cottony sub- 

 stance which forms a covering and protection to the soft- 

 bodied insects beneath, appears so conspicuous that its pres- 

 ence is readily observed. It attaches itself to rough places 



WOOLLY APHIS on root and branches. 



in the bark, in openings caused by wounds, where branches 

 have been cut off, and about the buds and fruit spurs ori 

 small branches. It impairs the vitality of the tree when al- 

 lowed to develop in considerable numbers. The sulphur-lime 

 spray helps to keep it in check, but kerosene emulsion is a 

 more effective remedy. Pure kerosene applied with a paint 

 brush to the trunk and main branches where it is found 

 seems to result in no injury to the tree and will kill the in- 

 sects. It is a difficult pest to eradicate. 



It is said that a "root form" of woolly aphis attacks the 

 roots of apple trees. Some authorities claim the so-called 

 root form is entirely a different insect, and it is named the 



