J. T. Wadswortii 01 



without attempting here to discuss this aspect of the question, I may 

 say that all the evidence obtained during the summer in this con- 

 nection supports their view. 



Trials of the discs have also been made with winter-greens and 

 flowering broccoli. Very little advantage has been apparent with 

 regard to these plants up to the present time (end of September). 

 Probable reasons for this fact being that the intensity of attack of the 

 second brood of flies was declining about the time when planting out 

 took place, and also because at this period (end of July and early 

 August) the greatest numbers of hrassica plants are growing in the 

 fields ; consequently the numbers of eggs laid near any single plant are 

 not likely to be so numerous as when fewer plants are in the fields and 

 gardens, as is the case earlier in the season. 



As stated above, tarred felt discs are regular articles of commerce in 

 America, where they are largely used by growers. The discs used in these 

 experiments were obtained from A. B. Cowles, 25, S. Water St., Rochester, 

 N.Y. ; they cost two dollars per thousand (120 for a shilling) in addition 

 to carriage. In this country at the present time tarred felt discs are 

 not obtainable commercially. Various kinds of materials, however, 

 have been tested this summer and arrangements are in progress whereby, 

 it is hoped, suitable discs will be purchasable at a reasonable price in 

 England. Growers who suffer losses from root-maggot attacks will thus 

 be enabled to test for themselves the value of this method of protection. 



LITERATURE REFERRED TO AND CONSULTED. 



(1) Blair, W. S. Experimental Farms Report, Canada, p. 362. 1904. 



(2) Britton, W. E. and Loa\'RY, Q. vS. Experiments in controlling the Cabbage- 



maggot in 1915. Report Agric. Exp. Stat., New Haven, Conn., pp. 114-118. 

 1916. 



(3) Britton, W. E. and Waldex, B. H. Eighth Report, Agric. Exp. Stat. Conn., 



pp. 832-837. 1908. 



(4) Caesar, L. 37th Report of Ontario Agricultural College, Canada, p. 40. 191 1. 



(5) Cakpenter, G. H. Injiuious Insects observed in Ireland during the year 



1901. Economic Proc, Royal Dublin Soc, Vol. i, 1902, pp. 141-144. 



(6) Gibson, A. and Treheene, R. C. The Cabbage Root Maggot and its Control 



in Canada, etc. Bull. No. 12, Dominion of Canada, Dept. of Agric, Entoni. 

 Branch. 1916. 



(7) GoFF, E. S. A new preventive against the Cabbage Maggot. 8th Ann. 



Report Agric. Exp. Stat. Univ. of Wisconsin, pp. 169-173. 1891. 



(8) ScHOENE, W. J. The Cabbage Maggot in Relation to the Growing of early 



Cabbage. Bull. No, 382, New York Agric. Exp. Station, Geneva, N.Y. 

 1914. 



