INSICCTS INIURIOUS TO IM^ETS AND Sl'IXACII 



I_7 



Otlicr kinds of catcri)illars, incliulins;' such well-known forms 

 as the zchra and sah-niarsh catcrpiUars, arc often found in hcct 

 fields, hut seldom iri sufficient numhers to do serious injury. As 

 a rule they readily yield to sprays of Paris green. 



GRASSHOPPERS 



Grasshoppers, or locusts, as well as crickets and some related 

 insects, are of great importance in the West, and frequently do 

 injury to sugar-beets. Many species attack this plant. 



Remedies. — The hopper-dozer is a necessary implement in our 

 warfare against this class of pests. It is discussed with other 

 grasshopper remedies on paj^T ']^ . 



d ^ ^^ J 



Fig. 81 —Beet leaf-miner, a. Fly; b, head of male fly; c, head of female; d. surface 

 of egg, highly magnified; e, egg.' /, maggot; g. head of same; /, anal segment; k- ana! 

 spiracles. All enlarged. (After Howard, U S. Dept. Agr.) 



LEAF-MINERS 



Hitherto insects which affect chiefly the foliage by chewing 

 have been treated. We now come to a consideration of insects 



