328 



The Spraying of Plants. 



wise the foliage may be seriously injured. Two applications 

 may be required after the first of August. For these, a clear 

 fungicide, such as the ammoniacal carbonate of copper, should 

 be used, but there is again danger of burning the foliage. For 

 this reason, the solution should not be made stronger than an 

 ounce to twelve gallons of water. Some injury may result even 

 from this dilute preparation, but it will be so slight that no 

 serious loss need be feared. Powders have proved unsatisfac- 

 tory in the treatment of peaches, as the leaves are so smooth 

 that but little of the material adheres to them. 1 



FIG. 64. Fruit severely attacked by 

 black spot. 



FIG. 65. Same as Fig. 64, 

 another view. 



Brown Rot; Fruit Rot; Twig Blight (Monilia fructigena, 

 Pers.). Description. Brown rot is probably the most serious 

 fungous disease with which peach growers are obliged to con- 



1 Peach trees should at all times be treated cautiously. At a meeting of the 

 A. A. A. S. held at Springfield, Mass., Aug. 2T, 1895, "P. H. Rolfs read a paper 

 upon ' Some unexpected results from spraying peach orchards.' He said : In spray- 

 ing peach orchards with the resin wash advised by the division of entomology, it 

 was found that the insecticide was excellent when used during dry weather. When 

 the wash was used late in the year and early in the spring, it was liable to destroy 

 the fruit buds. In no case did the insecticide affect the leaf buds. The experiments 

 show that the insecticide advised for winter use should not be used in winter in 

 Florida, but may be used in September and October." Springfield Republican, 

 Aug. 28, 1895, 4. See, also, Bull, xviii., Cornell Exp. Sla. 



