178 PESTS OF GARDEN AND FIELD CROPS 
The normal range of this species is through the Gulf states and neigh- 
boring territory. Remedies are the same as for the imported cabbage 
worm. ; 
The Diamond-back Moth (Plutella maculipennis Curt.) 
Tiny active green worms, scarcely more than a quarter of an inch long 
when full grown, eat small holes in the leaves of cabbage, and occasion- 
ally become so numerous that notable damage isdone. The adult isa 
delicate moth. There are two or three generations in the North, and 
half a dozen or more in the South. 
The remedies given for the imported cabbage worm will readily hold 
this species in check. 
The Cabbage Looper (Autographa brassice Riley) 
At the same time that the imported cabbage worm is found feeding 
oncabbage heads this species is likely to be observed at similar mis- 
Fic. 207.— The Cabbage Fic. 208.— Adult of the Cabbage 
Looper. Original. Looper. Original. 
chief. It is a light green worm, with a faint whitish stripe down each 
side, and moves with a looping movement, often resting with the middle 
of its body elevated. 
Remedies are the same as for the imported cabbage worm. 
The Celery Looper (Plusia simpler Guen.) 
Occasionally this species becomes abundant enough to be a pest, 
destroying the leaves of celery. It is a smooth-bodied caterpillar, and 
