WHAT AILS YOUR PLANTS 231 



Arsenate of lead, especially, sticks tightly. It is 

 this fact that makes it particularly valuable as an 

 insecticide: rain does not wash it off readily. 

 Bear this fact in mind when you measure out this 

 arsenate. 



BORDEAUX MIXTURE 



This is undoubtedly the best known and most 

 widely used combination for the control of fungous 

 diseases. Among the fungicides it occupies a posi- 

 tion like that formerly held by Paris green among 

 the insecticides, before the introduction of lead 

 arsenate. 



In your garden you'll need it for anthracnose of 

 the bean and cucumber, for leaf spot of the beet 

 and currant, for early and late blight of the potato, 

 and a dozen other ills. Don't forget that any 

 fungicide is a preventive rather than a cure. It 

 must be applied early, before the disease has made 

 a good start. 



Standard Formula. The regular formula now 

 in general use calls for four pounds of copper sul- 

 phate, four to six pounds of quicklime, and water 

 to make fifty gallons. 



To Make One Gallon. Take one heaping table- 

 spoonful of copper sulphate; one and a half round- 

 ing tablespoonfuls of quicklime. 



This is the equivalent of one ounce of the copper 

 sulphate and one and a quarter ounces of the 

 quicklime. If your copper sulphate is in large 

 crystals, break them up with a hammer until 

 there are no pieces larger than one-fourth to one- 



