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JOURNAL OF ECONOMIC ENTOMOI-OGY 



[Vol. 10 



In brief, the methods of conducting the tests are as follows: — 

 Commencing with the latter part of March the radish seed is sown by 

 means of a garden drill in beds at intervals of one week until about the 

 middle of May. As soon as planting is completed, the frames, con- 

 sisting of 12-inch boards, are placed in position when the cheesecloth 

 is attached. With the appearance of the first pair of true leaves the 

 plants were thinned and weeded; and when of desirable size they were 

 pulled and weighed. 



The weights of plants grown in screened frames and in open beds for 

 the years 1914-lG are given in Table I. 



Table I, Showing Weights op Radishes in Screened and Open Beds 

 (Counts and weighings arc based on rows of 100 feet in length.) 



An examination of the foregoing table shows that in most of the 

 plats in the screened frames there was a larger stand of plants as com- 

 pared with the uncovered beds, and data at hand also indicated that 

 there was a correspondingly larger number of marketable roots. As 

 demonstrated in our experiments with cabbage seedlings, these differ- 

 ences are due to several factors. First of all cheesecloth, if properly 

 attached, affords complete protection from root maggots and, accord- 

 ing to the fineness of the mesh, reduces to a more or less extent in- 



