There are certain species of plant lice that attack not 

 only the above ground portions but also feed upon the 

 roots and root crowns of the trees. When our problem is 

 the control of such insects as these, special methods of pro- 

 cedure are necessary. The best known of these pests is 

 the Wooly Aphis of the apple an insert that is familiar 

 to all who are interested in the growth of this fruit. Very 

 briefly we may say that the general method of procedure in 

 such cases as these is to work in about the tree and root 

 crown such materials as wood ashes or tobacco dust. Thes3 

 materials have a /tendency to either destroy the insects or 

 discourage their attack at the point where it is most dam- 

 aging, the root crown. Special cases of this character, how- 

 ever, demand special study and treatment. 



In the control of certain of the insects with sucking 

 mouth parts no spraying or other method of ordinary pro- 

 cedure is of use and we are reduced to the practice of 

 "hand picking" or jarring the insects off of the infested 

 plants in our control efforts. This is true of the larger rep- 

 resentatives of the series, as for example, the so-called 

 ^squash bug," (Anasa tristis,) where spraying is of little 

 or no value and control is obtained only by the removal 

 and destruction of the individual insects. 



There are many other insects of the type with sucking 

 mouth parts to which attention might be called but we be- 

 lieve the purpose of this paper is served in citing the in 

 stances above noted. 



Whether the insect causing damage is of the biting or 

 sucking type, a reasonable study of it and its activities 

 allows us to apply remedial measures far more economi- 

 cally and with a greater hope of success than would be 

 the case without this study. The purpose of this Bulletin 

 will have been served if it brings about a closer study of 

 the insect causes of loss in this state and a more intelligent 

 application of remedial measures. 



