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 
eA 
rapidly. 
ed. 
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permease 
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Fic. 70. Steam spraying outfit, manufactured by Shipman 
Engine Co., Rochester, N. Y. 
they feed, disappear more or less 
They may generally be de- 
stroyed by applying a poison to the 
foliage, for which purpose the arsen- 
ical compounds (284) are well adapt- 
In cases where the use of a 
deadly poison is unsafe, hellebore » 
(289) or pyretbrum (290) may be sub- 
309. The Root-Eat- 
ers include fewer species 
than the leaf-eaters (308) 
and are usually more 
difficult to control. 
Carbon _bisulfid, 
in- 
jected into 
the soil 
about the 
roots of 
cabbage 
and cauli- 
flower 
plants, with 
an instru- 
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. 
