160 Principles of Plant Culture. 
devour the roots; and burrowers, those that harbor within 
some parts of the plant by eating a passage for their bodies. 
308. The Leaf-Eaters include numerous species. They 
are readily recognized by the fact that the leaves, on which 
they feed, disappear more or less 
rapidly. They may generally be de- 
stroyed by applying a poison to the 
foliage, for which purpose the arsen- 
ical compounds (284) are well adapt- 
ed. In cases where the use of a 
deadly poison is unsafe, hellebore 
289) or pyrethrum (290) may be sub- 
4 stituted. 
309. The Root-Eat- 
ers include fewer species 
than the leaf-eaters (308) 
and are usually more 
" 
fe difficult to control. 
Carbon  bisulfid, in- 
jected into 
the soil 
about the 
roots of 
cubbage 
and cauli- 
flower 
plants, with 
Fie. 70. Steam spraying outfit, manufactured by Shipman an instru- 
Engine Co., Rochester, N. Y. ment devis- 
ed for the purpose (Fig. 71), has been successfully used to 
destroy the cabbage maggot,* and may be found useful in 
* Phorbia brassice. 
