92 l^eport on a Trial of Tarred Felt "Discs'' 



(9) ScHOENE, W. J . The Cabbage Maggot : Its Biology and Control. Bull. No. 419, 

 New York Agric. Exp. Station, Geneva, N.Y. 1916. 



(10) ScHOYEN, W. M. Beretning Skadeinsekter og Plantesygdomme, p. 2.3. 189(). 



(Quoted from Schoene.) 



(11) Slingerland, M. V. The Cabbage Root Maggot with notes on the Onion 



Maggot and Allied Insects. Bull. No. 78, Cornell Univ. Agric. Exp. Station, 

 Entom. Division. 1894. 



(12) Smith, J. B. Report Entom. Dept. New Jersey Exp. Stat, p. 439. 1907. 



(13) Theobald, F. V. Report on Economic Zoology, Wye, pp. 53-54. 1905f 



(14) Report on Economic Zoology. South Eastern Agric. Coll., Wye, p. 93. 



1913. 



(15) Washburn, F. L. Report on Injurious Insects of 1907 and 1908. Annual 



Report Minnesota Agric. Exp. Stat. 1908-9. 



DESCRIPTION OF PLATE XIV 



V"\ii. 1. Photoi;rapli showing appearance of the cauliflower plot on July 4th. Rows 1 

 and III (counting from the field on the left side of the photograph) were protected 

 with tarred discs, rows II and IV were unprotected. The remaining rows of plants 

 were not utilised in these experiments. 



Fig. 2. Photograph of a brussels-sprout plant sliowing a disc in positiou. 



Fit;.:}. Outline figcure of a disc : aetiud .si/e. 



