230 WAR ON FIELD AND GARDEN PESTS 



For the arsenate of lead mixture use the following: 

 Lead arsenate, 6 pounds; water, 120 gallons. This mix- 

 ture stays in suspension better than paris green, but is 

 more expensive and has little advantage over paris green 

 except where rains are frequent it is less likely to burn 

 the foliage. Arsenate of lead will adhere to the foliage 

 longer and therefore should be more valuable for the late 

 sprays or for leaf-eating insects. 



After five years of experimenting with different spray 

 material in apple orchards, the New Hampshire station is 

 just out with suggestive conclusions. The work was con- 

 ducted on different farms in different parts of the state, 

 and the sprays were used primarily as fungicides. Prof. 

 Charles Brooks, author of the bulletins, reaches con- 

 clusions a bit contrary to the general spraying verdict. 

 While lime-sulphur is advocated as the best all-around 

 spray, Prof. Brooks says : "No fungicide has been found 

 that holds diseases in check as well as bordeaux. When 

 showers follow soon after an application of bordeaux, 

 the leaves are likely to be spotted and the fruit somewhat 

 rusted. However, the injury to fruit is seldom great 

 enough to be of importance when apples are sold in 

 barrels. If extra fancy fruit is wanted for sale in boxes, 

 the use of bordeaux under New Hampshire conditions 

 seems questionable." 



Second thought will indicate that Prof. Brooks is not 

 so far from the general advice given on spraying. People 

 want fancy fruit, hence they substitute lime-sulphur. It 

 is largely to avoid spray injury that lime-sulphur has 

 replaced bordeaux. No one ever questioned the high 

 value of bordeaux as a fungicide. The trouble is it does 

 too well, reaching the fruit as well as fungus. In New 

 Hampshire experience, no commercial bordeaux has been 

 found as satisfactory as home-made. "The best formula 

 of bordeaux for the apple orchard is 3-3-50, that is, three 



