408 Report of the Entomologists of the 



It was with the intention of combating the looper that an effort 

 was made to find a substance that could be made to adhere uni- 

 formly to the surface of the leaves of cauliflower and cabbage. 

 Most of the tests given were made, and effects on cabbage looper 

 noted, for this purpose. The results obtained on the cabbage 

 worm were of secondary importance as compared with results 

 sought on the cabbage looper. The tests have proven as satisfac- 

 tory as could be expected. 



The letters from Mr. Baylis and from Mr. Goodale show that 

 the results were worth far more than the cost of treatment, 

 although they considered the results obtained from the treat- 

 ment of the cabbage worm as well as the looper. The results 

 obtained from the treatment of cauliflower were not as satisfac- 

 tory as those from the treatment of cabbage, but when we con- 

 sider the character of the plant combined with the habits of the 

 pests to be treated the results were better than should be expected. 

 For the most part the leaves of cauliflower grow in a vertical 

 position; hence it would be not only a waste of material but also 

 of time to attempt to treat them with a dry insecticide. Fair 

 results might be obtained on cauliflower by the use of insecti- 

 cides which kill by contact, but these would only be practical 

 while the plants are small and would need to be applied every 

 week, as eggs and full grown caterpillars are liable to occur on 

 the plants at the same time. As already stated the use of trap- 

 crops is of doubtful value for the cabbage worn. They are 

 surely of no value for the looper, even though combined with the 

 removal of old cabbage stumps from the field and the destruction 

 of weeds along roadsides and borders of fields, for, as has been 

 shown, the looper has no fixed food plant. (It is not the inten- 

 tion to discourage the destruction, of weeds on the borders of 

 fields, or the clearing up of old cabbage fields. This should be 

 done on general principles.) The capturing of the moth of the 

 cabbage looper by any means is also impractical. Hence for 

 this pest, as far as tested, we have no alternative but to use an 



