345 



CABBAGE AND CAULIFLOWER. 



The green caterpillars (Fig. 159) hatch from eggs laid by the com- 

 Cabbage-wonn. mon white butterfly. There are several broods every season. 



If plants are not heading, spray with kerosene emulsion or with 

 Paris green to which the sticker has been added. If heading, apply hellebore. 



These small mealy plant-lice are especially troublesome during 



cool, dry seasons when their natural enemies are less active 

 Cabbage aphis. Before the plants begin to head, spray with kerosene emulsion 



diluted with 6 parts of water, or whale-oil soap, i lb. in 6 gals. 



of water. 



The white maggots that feed on the roots (Fig. 1 60) hatch from 



Cabbage eggs laid by a small fly somewhat resembling the common house 



root-maggot, fly, near the plant at the surface of fhe ground. HoUow out the 



earth slightly around every plant and freely apply carbolic acid 

 emulsion diluted with 30 parts of water, ^egin the treatment early, a day or two 

 after the plants are up or the next day after they are set out. Repeat the appiica . 



Fig. 160. Cabbage root-maggots. 



tion every 7 to i o days imtil the latter part of May. It has also been found practic- 

 able to protect the plants by the use of tightly fitting cards cut from tarred paper. 

 Cornell Bulletin 78. 



ONION. 



Onion tops frequently turn white and die as the result of the 



Onion thrips. feeding punctures caused by these minute yellowish insects. 



The injury is know as "white blast." Spray thoroughly with 



kerosene emulsion diluted with 6 parts water, or whale-oil soap, i lb. in 4 gals, of 



water. 

 Onion maggot. For treatment see cabbagb koot-maggot. 



