No. 4.] MARKET GARDENING. 103 



we must seize the opportunity in that life cycle where the 

 insect is least protected to pounce upon it and crush it out 

 of existence. This scientific work must precede the practical 

 work. We must find the salient point at which it can be 

 best attacked. While I yield to the justice of the criticism 

 that I have heard more than five times in the last twenty-four 

 hours, that too often this scientific work is stopped without 

 being carried on to find the corresponding treatment for prac- 

 tical application, the salient point must be discovered first. 



A practical treatment is what is needed at the present 

 time. Look over the directions that have been given for 

 the treatment of the cabbage maggot. I have read page 

 after page on this subject. One method given is to take 

 tarred paper and have a block made with three sharp edges 

 and stamp out hexagonal pieces from that paper, and go 

 through the fields of cabbage and carefully place these 

 papers around the stems. That is an excellent remedy for 

 the cabbage maggot, but I am ready to say that the man 

 who discovered that remedy never attempted to cover tea 

 acres of cabbages with it, or he would have given it up. 



We want facts and methods that can be applied to twenty 

 acre fields. The problem of finding remedies that are inex- 

 pensive enough to make it pay to use them is the problem 

 of the future, in my opinion. 



Question. What would you use to destroy the cabbage 

 worm? 



Dr. Fernald. Paris green. 



Question. Would it not be dangerous ? 



Dr. Fernald. I have never learned that it has been 

 found so. I am giving the experience of the larger cabbage 

 growers of the Middle States, where they grow for the New 

 York and Philadelphia markets. They do not say anything 

 about it, but they use Paris green right along. 



There is a repetition of broods during the year ; the later 

 broods coming from the earlier broods. If you reduce the 

 broods to a few individuals the first of the season, you 

 have practically nothing to deal with the last of the season. 

 The first of the season you can use Paris green safely. You 

 can use it even after the cabbage begins to head, because it 



