328 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



states that the life history is similar to that of the imported 

 cabbage worm, and it seems probable that there are three genera- 

 tions a year in the Middle States, and possibly more farther 

 South. Injury to cabbage seems to be worse in late summer. 

 When full grown the larva spins a very thin, transparent, white 

 cocoon, attached to the leaf upon which it has been feeding and 

 in it transforms to the light-brown pupa. The pupal stage varies 

 from a week in midsummer to three weeks in October, and the 

 pupae of the last brood hibernate over winter. 



The moth has a wing expanse of about 1 J inches, and the fore- 

 wings are grayish-brown mot- 

 tled with gray, whitish, and 

 blackish, as shown in Figs 

 277, 278. Just inside of the 

 centre of the fore-wings is a 

 characteristic white spot. The 

 hind-wings are paler brown, 

 with the outer border darker, 

 and the margins of both 

 wings are strongly scalloped. 



Control. The same general 

 methods as advised for the im- 

 ported cabbage worm will 

 effect the control of this spe- 

 cies. Sirrine states that dust- 

 ing the plants with Paris green 

 has not proved satisfactory, 

 but found the use of Paris 

 green with the resin soap stick- 

 er to be very effective. Arsen- 

 ate of lead is more adhesive 

 and is therefore superior for 

 cabbage but will be improved by the addition of the "sticker." 



FIG. 278. The cabbage looper moth 

 at rest from side and from above 

 natural size. 



The Diamond-back Moth * 



The larvae of the imported diamond-back moth or cabbage 

 plutella are commonly found on cabbage wherever it is grown 



: ' : Piutella fnaculipennis Curtis. Family Tineidce. 



