126 VEGETABLE GARDENING 



Remedies. The number of these pests varies greatly 

 from year to year. The chief remedies are arsenical poisons 

 applied to the foliage. For this purpose Paris green is 

 mostly used, and arsenic of lead to some extent. The 

 method of applying them varies much. The quantity of 

 Paris green to use is one pound per acre for each applica- 

 tion in from twenty-five to seventy-five gallons of water or 

 Bordeaux mixture. The agitation must be thorough, to 

 prevent the Paris green from settling. It is a good plan to 

 add freshly slaked lime to the Paris green mixture at the 

 rate of one to two pounds of stone lime to one pound of 

 Paris green. 



Arsenate of lead may be used instead of Paris green. It 

 has the advantage of sticking much better in rainy weather 

 and of being less liable to burn the foliage. It must be 

 used at the rate of five or six pounds per acre for each appli- 

 cation, in from twenty-five to seventy-five gallons of water 

 or Bordeaux mixture. It usually comes on the market in a 

 paste form. It is more costly to use than Paris green. 

 Liquid mixtures may be applied with a watering pot or 

 brush broom, but a spray pump is most economical, and 

 on large areas a large one- or two-horse outfit is necessary. 



Paris green may be safely applied when mixed with 

 twenty-five times its bulk of flour, sifted ashes, or road dust, 

 or mixed with twenty-five pounds of land plaster. Other 

 poisons than the above should be used with caution. 



It is very important to apply the poison as soon as the 

 young larvae can be seen on the leaves, for they are more 

 easily killed at this stage, requiring about a third less poison 

 than later on. Plants injured when young are severely set 

 back. 



Imported and Native Cabbage Worms (Pieris sp.). 

 The imported cabbage worm resembles our native species, 



