94 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 tablespoonful of air-slaked 
hme 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. 
