INSECTS INJURIOUS TO CABBAGE AND OTHER CROPS I45 



Remedies. — The simpler cabbage worm remedies are suffi- 

 cient in ordinary cases. Pyrethrum is valuable as is also kero- 

 sene emulsion, but Paris green, unless applied as an under- 

 spray, which is difficult with most cruciferous crops, is reported 

 not so effective. 



Cutworms will attack cabbage, turnip, and similar plants 

 when available, and there are a number of caterpillars, other 

 than those which have been considered, which do great damage 



Fig. 96.— Diamond-back moth, a. Larva; b, c. segments of same; d, pupa; e, pupa in 

 cocoon; /. h, moth; g. wings of dark form of moth; /, last segment of pupa- All en- 

 larged. (After Riley. U. S. Dept. Agr.) 



to these crops. When cutworms become abundant late in the 

 season, plants are damaged in the same manner as by the 

 imported cabbage worm, by eating the more tender portions and 

 penetrating into the hearts. Severe injury is often reported, 

 e. g., in one garden only 30 plants out of 600 escaped, while 

 it is not uncommon to lose half or more of the plants early in 

 the spring. The fall army worm, salt-marsh caterpillar and 

 "woolly bears" frequently attack cole crops, and the first 

 mentioned when numerous does damage of great seriousness. 

 The zebra and clover caterpillars appear to favor these crd^s 

 among others grown in gardens, and the garden webworm also 

 affects them. These species are treated in preceding chapters. 



