5 



Gas lime, applied about each plant, has often been advised as a 

 remedy, but those who have tried it are almost equallj' divided as to its 

 efficac3\ It is well worth further experiment where the gas lime can 

 be obtained fresh without diflficultj-. It niaj- frequently be had for the 

 cost of carting. 



The hisuJphidof carbon treatment. — In case tarred paper cards, which 

 will presently be described, or other preventive methods here given, are 

 not employed, and the insects occur in great numbers at the roots of 

 cabbage, bisulphid of carbon may be used. It should be applied below 

 the root sj'stem with a special injector or syringe,^ taking care tliat the 

 application is not made di- 

 rectly to the plants, as it is 

 very likelj^ to kill them. A 

 hole is made a little distance 

 (3 or 4 inches) from the 

 plant, and the injector in- 

 serted at an angle, as shown 

 in fig. 2. After injecting the 

 liquid the instrument should 

 be withdrawn and the hole 

 closed by packing it down 

 with the foot. From a tea- 

 spoonful to a tablespoonful to 

 each 3'oung plant, and a sin- 

 gle application, is generall}^ 

 sufficient. 



Tarred paper cards. — The 

 use of disks or pads of tarred 

 paper for the protection of 

 cabbage against the oviposition of the fly was perfected in 1889 by Mr. 

 W. H. Goff, who describes his cards and the manner of cutting them as 

 follows: 



Tlie cards are cut in a hexagonal form (fig. ?>), in order to better economize 

 the material, and a thinner grade of tarred paper than the ordinary roofing felt 

 is nsed, as it is not only cheaper, but being more flexible, the cards made from 

 it are more readily placed about the plant without being torn. 



The blade of the tool, which should be made by an expert blacksmith, is 

 formed from a band of steel, bent in the form of a half hexagon, and then taking 

 an acute angle, reaches nearly to the center, as shown in fig. 5. The part mak- 

 ing the star-shaped cut is formed from a separate piece of steel, so attached to 

 the handle as to make a close joint with the blade. The latter is beveled from 

 the outside all around, so that by removing the part making the star-shaped cut 

 the edge may be ground on a grindstone. It is important that the angles in the 

 blade be made perfect, and that its outline represent an exact half hexagon. 



'What is known as the McGovven injector, formerly manufactured at Ithaca, 

 N. Y., but no loTiger for sale, has proved most successful. 



Fid. 2.— Bisulphid of carbon injector in use. 



