THE GARDEN PRIMER 



to use something else on plants that are soon to be 

 eaten. 



The powder made from the roots of white helle- 

 bore is the best substitute for an arsenical insecticide. 

 It poisons insects in the same way that the arsenicals 

 do but is less dangerous to man, although it is distinctly 

 poisonous and will cause death if enough of it is taken. 



In some instances 

 poisonous gases or 

 fumes are prefer- 

 able to any direct 

 application, but 

 these are special 

 cases. 



The haustel- 

 late insects are 

 provided with a 

 haustellum or pro- 

 boscis — a sucking 

 beak — which they 

 Sucking or Haustellate. Head of thrust down into 

 Aphid— a Green Pea Louse. the soft inner tis- 



sues of a plant, 



whence they extract the juice. All of the true bugs 

 belong in this class, all of the scale insects, and the plant 

 lice or aphids. The injury which they do is not so imme- 

 diately noticeable as that done by the mandibulates, but 

 it is quite as serious. Indeed, because it is not so 

 apparent it may very easily be much more serious, be- 

 cause undiscovered for a time. 



42 



