26 



now affecting cotton. Other pests will in all probability appear, 

 both from among the native insects and from foreign lands. 

 The vast importance of strict quarantine measures with regard 

 to imported seed or other cotton stock is here emphasized. 



With respect to the introduced pests of cotton, efforts to 

 secure their natural enemies in the lands from which the pests 

 have come are commendable. Resort to artificial methods, such 

 as the use of insecticides, in combating cotton pests, has not 

 been much advised, for practical reasons, but if their use should 

 become necessary and it were shown that they could be used 



Fig. 18 — A predaceous bug:, 

 Zelus renardii Kolenati. 

 (Copied from Swezey). 



effectively, the question of practicality might disappear. In 

 such contingency it is thought desirable to ascertain, as time 

 permits, the relative effectiveness of various insecticides with 

 respect to several of the more important pests. 



