25G INSECTS INJURIOUS TO STAPLE CROPS. 



of the winter temporarily suspends the physiological 

 activities of the species. The winged females, appearing 

 from time to time during the summer and fall, serve to 

 distribute the species generally, new colonies being started 

 wherever these females find lodgment and food. In dis- 

 tricts liable to injury by this insect it seems inadvisable 



k 



Fig. 145. — The Beet-aphis {Pemphigus beire Doane). a, winged 

 female; b, wingless female; c, antenna of winged female. 

 (After Doane.) 



that beets should be the fiist crop on new land, or that 

 ground should be continued in beets or in any other root- 

 crop after the pest has made its appearance in the field." 



CUTTING THE TOPS. 



Cutworms. 



Like all similar crops, the sugar-beet is often subject to 

 the midnight raids of the deadly Cutworms, and when 

 present in any number they should be carefully guarded 

 against while plants are young. Like the Web -worms, 

 they are worse upon a sandy soil, and like the Wireworms, 

 when the beets are on land previously in grass. 



These well-known depredators are the larvae of moths, 

 which, from their habit of flying at night, are known as 



