106 BOARD OF AGRICULTURE. [Pub. Doc. 



using Paris green or one of the arsenicals for this purpose, 

 and they also told me that they did not say anything about 

 it. That may in a measure explain why excitement has not 

 already developed. The treatment has been in use for nearly 

 ten years in the Middle States. 



Another point 1 want to mention is this. I said, if you 

 destroy the early broods of the cabbage worm, you do not 

 need to use the later treatments. In other words, if the 

 first treatment or the first two treatments are successful, 

 you can stop using the arsenicals before the cabbage begins 

 to head. 



Question. Would it be practical to apply Paris green to 

 the cabbage with the same implements we use. in applying it 

 to the potato ? Put it on dry ? 



Dr. Fernald. I always like to mix it with lime. The 

 fact is that the arsenic in Paris green is part combined and 

 part uncombined. It is the uncombined arsenic that does 

 the l)urning. It seems to be generally the case that where 

 you can combine all the arsenic with lime, you reduce or en- 

 tirely prevent the danger of burning. You do not get as 

 certain results when using it dry as you do when using it in 

 a liquid form. Still, I have seen it used in just that way on 

 the cabbage on a small scale. 



Question. Isn't air-slaked lime a remedy for the cabbage 

 worm ? 



Dr. Fernald. I wish I could say yes. It is successful, 

 perhaps, in some cases, but you cannot rel}^ upon it entirely. 



Mr. E. "VV. Boise (of Blandford). Wouldn't 3'ou place 

 more weight on the arsenate of lead for destroying the 

 potato beetle than on Paris green ? I have used it the past 

 year with marked results. 



Dr. Fernald. The only reason I did not speak of arse- 

 nate of lead in reference to the cabbage was because of 

 having in mind an extra precaution to avoid danger. Arse- 

 nate of lead has remarkable staying qualities ; it will adhere 

 to the foliage much longer than Paris green. Where you 

 are dealing with potato tops, I should say it was very desir- 

 able to use arsenate of lead ; whereas, with the cabbage, if 

 the poison will stay on long enough to kill the first brood, 

 that is all that is really needed. We do not want the poison 



