36 MANUAL OF VEGET ABLE-GARDEN INSECTS 



to thirty threads to the inch. Cloth that is too tightly woven 

 will exclude too much sunlight and make the plants spindling. 

 The screen should be removed a week or ten days before trans- 

 planting in order to harden the plants. Plants grown under 

 cheesecloth cover are not only protected from the attacks of 

 root-maggots and flea-beetles but, owing to the retention of 

 warmth and moisture, make a much better growth than in the 

 open. Screened beds do not ha\'c to be as large as open beds 

 because under these conditions practically all the jolants make 

 the proper growth. 



For radishes. — Carbolic acid emulsion has been used with 

 some success on this cro]), but better results can })e obtained by 

 growing the plants in beds screened with cheesecloth as de- 

 scribed above. 



References 



Cornell Agr. Exp. Sta. Bull. 78. 1894. 

 N. J. Ajrr. Exp. Sta. Bull. 200. 1907. 



N. Y. (Geneva) Agr. Exp. Sta. Bull. 301. 1908. 



N. Y. (Geneva) Agr. Exp. Sta. Bull. 334. 1911. 



N. Y. (Geneva) Agr. Exp. Sta. Bull. 382. 1914. 



N. Y. (Geneva) Agr. Exp. Sta. Bull. 419. 191('). 

 Dept. Agr. Canada Ent. Bull. 12, pp. 9-29. 191G. 



N. Y. (Geneva) Agr. Exp. Sta. Bull. 442. 1917. 



The Seed-Corn ^Maggot 



Phorbia fusciccps Zetterstedt 



The injury caused by the cabbage root-maggot is often 

 augmented by the presence of a closely related species which 

 has received the rather inappropriate common name given above. 

 The seed-corn maggot is generally distributed throughout the 

 United States and Canada and also occurs in Europe. In addi- 

 tion to cabbage and related plants, it attacks sprouting seed corn, 

 beans and peas, and has been recorded as feeding on seed pota- 

 toes and onions. The food of this species is not confined to vege- 



