22,2. 



INSECTS INJURIOUS TO VEGETABLES 



and can be picked off by hand and destroyed, and if this is 

 carefully done little apprehension may be experienced of dam- 

 age. Clean culture and crop rotation are always to be prac- 

 ticed a id the leaving of tobacco suckers, or abandoned rem- 

 nants should be avoided, as the "worms" frequently remain 

 in the field until the plants are killed by frost. It should be 

 unnecessary to add that the worms may be killed by spraying 

 with arsenicals. Turkeys are utilized in destroying these in- 

 sects in the South. 



The Southern tobacco worm (Plilcgcfhoiitiiis sc.vta Job.). — 

 The differences of this sj^ecies and tlie preceding have been 

 pointed out. In brief, the moth (fig. 148, a) is darker, and 

 the five orange spots on the body are larger and brighter. The 

 "worm" has only seven oblique while lines on the sides, and 



Fig. 148.— Southern tobacco worm. a. Moth; b, full-grown caterpillar; c, pupa. Half 

 natural size. CAfter Howard, U. S- Dept. Agr.) 



the tail is more curved and red. The pupa has a shorter 

 I)roboscis. The Southern tobacco worm is distributed through 

 the United States from the Atlantic to the Pacific, and from 



