New York Agricultural Experiment Station. 397 



flower were sprayed with the same mixture, as was also a trap- 

 crop 13 of rutabagas which had been set on the border of the field. 



When the plants were examined, June 2, a few dead worms 

 were found. The plants had been so severely attacked by the 

 cabbage root maggot that the field had to be reset. This was 

 done on June 5, the plants being dipped, roots and all, into the 

 resin lime mixture before setting. This treatment was too severe 

 for the plants. 



A third attempt was made to get a stand of medium early cauli- 

 flower, but the plants were obtained from a seed bed infested with 

 club-root, hence the crop proved a failure. 



Very few worms were to be found throughout the summer on 

 the trap-crop. 



Another attempt was made to test resin lime mixture on cauli- 

 flower, also on Brussels sprouts. In a field of nearly 10 acres 

 about 1-2 acre of cauliflower and 1-4 acre of Brussels 

 sprouts were sprayed with the mixture 14 on August 31. Inspec- 

 tion of the work on September 8 showed that many of the cabbage 

 worms, also caterpillars of the cabbage Plutella, or diamond 

 backed moth, had been killed. ISTo dead loopers were found. 

 The field was resprayed September 29. Many of the cauliflower 

 plants were heading and could not be sprayed at time of the 

 second application. When examined, October 15, the sprayed 



13 Rutabagas were set on the margins of the field, the object being to furnish 

 plants at which all the butterflies of the cabbage worm in that vicinity could 

 collect and deposit their eggs, and by keeping these plants sprayed througM- 

 out the summer with the resin lime mixture and Paris green, to minimize the 

 number of worms. The rutabagas were set several weeks before the cauli- 

 flowers were put out. This method is of little value on Long Island, for the 

 simple reason that Siberian kale, and frequently Brussels sprouts and cabbage 

 stumps are left on the fields over the winter and during the spring. These to- 

 gether with wild radish which grows plentifully along fences and in neglected 

 fields furnish abundant places for the butterflies to deposit their eggs. 



14 An attempt was made to spray cauliflowers with Paris green and Bor- 

 deaux mixture combined; such a small amount of this adhered to the leaves 

 that the test was abandoned. Most of the loopers were found spinning cocoons 

 at the time of spraying, August 31. The resin lime mixture was applied with 

 a knapsack sprayer. 



