LOOPERS, OR MEASURING WORMS 



179 



moves with a looping gait. On 

 each side of its body is a row of 

 dark dots or rings. Hibernation 

 takes place as a half-grown cater- 

 pillar. There are three broods 

 annually. The pest may be 

 checked by the use of arsenicals, 

 preferably Paris green and lime, 

 which can be washed from the 

 leaves when the stalks are ready 

 to use. 



Fig. 200. 



•Adult of the Celery Looper. 

 Original. 



The Northern Grass Worm {Drasteria erechtea Cramer) 



Clover and grasses sometimes are damaged by a fairly large '' meas- 

 uring worm," which eats the leaves. When full grown the worm is 

 Ij inches long, striped with 

 gra}' and brown, and has 

 the habit of moviiig with a 



,-*»<^ 



Fig. 210.— The Northern Grass 

 Worm. Original. 



Fig. 211. 



-Adult (>{ the Xorthcni Crass 

 Worm. Original. 



looping gait. It transforms in a nest made by drawing leaves to- 

 gether with silk. There are several generations in the course of a 

 summer. The best means of control in periods of excessive abun- 

 dance is fall plowing. 



The Hop Snout-moth (Hypena humuli Harr.) 



The foliage of hops is attacked by green caterpillars an inch long 

 when full grown. The body is dotted with black, there is a dark stripe 



