212 VEGETABLE FOES AND DISEASES 



4. Carbolic acid emulsion. Made by dissolving 

 one quart of soft soap in a gallon of boiling water, into 

 which one pint of crude carbolic acid is then poured 

 and the whole stirred into an emulsion, in which 

 condition it will remain for a long time. For use 

 dilute one part of the emulsion with thirty parts of hot 

 water, stirring well and using at a temperature of 135 

 by means of a knapsack sprayer. This preparation, 

 like paraffin oil emulsion, is best applied when the 

 plants are young. It is not advisable to apply it after 

 the plants have commenced to heart. The smell ap- 

 pears to deter the moths from depositing eggs in the 

 plants, and it also acts as a deterrent of the Cabbage 

 Fly, Phorbia brassicae. Spray at intervals of ten days 

 or a fortnight from the plants being set to their be- 

 ginning to head or heart. 



5. Pyrethrum (insect or buhach) powder is ex- 

 cellent for killing common Cabbage caterpillars. It 

 should be fresh, and may be mixed with six or eight 

 times its bulk of flour, and dusted on the plants with 

 a dredger or bellows apparatus. Or the powder may 

 be mixed with water in the proportion of one ounce 

 to three, four or five gallons of water, sprinkling or 

 spraying upon the plants. The dusting or spraying 

 should be performed about once a week during the 

 time the worms are present, then they will cause little 

 or no trouble. 



THE ILLUSTRATIONS REPRESENT THE CABBAGE MOTH AND ATTACK 

 ON SAVOY. 



