254 SCHOOL AND HOME GARDENS 



the weather is favorable will stand light frosts and may 

 be set out in April. They should be set deeper than be- 

 fore, to encourage a stronger growth of root and to 

 avoid having the roots loosened by the wind. 



The early varieties should be set in rows two feet 

 apart, with a distance of eighteen inches between the 

 plants. Late cabbages should be at least two feet apart 

 each way. 



Diseases. For clubroot, dress the land with air-slaked 

 lime at the rate of about seventy-five bushels per acre ; 

 destroy diseased plants and rotate the crop from year 

 to year. 



For prevention of black rot, rotate the crop and 

 remove all affected leaves. 



Pests. To destroy the cabbage worm the plants may 

 be sprayed with Paris green or arsenate of lead soon after 

 they are set out. When the heads are nearly grown, 

 they should be dusted with hellebore. 



If a plant has been killed by a cutworm, dig for it 

 near by. The other plants may be protected by paper 

 collars. (For poisoned bait, see p. 203.) 



For protection against the root maggot, place paper 

 shields closely about the stems immediately after set- 

 ting out, and apply nitrate of soda around but not touch- 

 ing the plants ; or place a tablespoonf ul of air-slaked 

 lime or tobacco dust around each plant. Burn all plants 

 that have been killed by root maggots. 



For aphis and thrips, use kerosene emulsion or whale- 

 oil soap. 



