TWENTY-FIRST ANNUAL MEETING. 



203 



tary sulphur sprays are entirely unusable with present ar- 

 senicals, since they are compounds of sulphur with soda or 

 potash ; (4) that the solvent action of a normal lime-sul- 

 phur solution in combination with arsenicals can be practi- 

 cally eliminated in three ways — either by properly putting 

 the sulphur out of solution or by using an arsenical of the 

 highest grade or apparently by adding lead in a proper 

 form to the ordinary lead arsenates before combining them 

 with soluble lime-sulphur sprays. 



The basis for the first three of these deductions is par- 

 tially shown in Table I, and that for the fourth is shown 

 later in Table II. 



TABLE I. 

 Spray Injury on Fruit, Foliage and Twigs of Peaches in 1910. 



Per ct Per ct. Per ct. Per ct. 



Fruits in Fruit Fruit Twig Leaf 



Plot. Treatment. Sample.^ Injured. Drop. Injury. Drop. 



I. Check= 549 5-10 



III. Self-boiled L-S & Lead Shot- 

 Arsenate (2-8-8-50) ... 430 holes 



IV. L-S (1.003) and Arsen- 

 ate of Lead 424 5 5 5 



V. L-S (1.003) and Arsen- 



ite of Lime 487 2.26 5 5 10 



VI. L-S (1.003) and Arsen- 

 ate applied with CO- 



Gas 453 10.8 50 20 50 



VII. Sulfocide and Arsenate 245 6.94 90 70 90 



VIII. Sulfocide and Arsenite 359 10.58 40 30 50 



IX. Pyrox (5-50) 377 47.2 50 50 65 



X. Bordeaux (^-6-50) and Shot- 



Arsenate 515 10.7 1 holes 



XI. Bordeaux (14-6-50) and Shot- 



Arsenate 459 9.8 5 holes 



XIIL Check 495 5-10 



* In this and following table, the effect of the various treatments on the 

 picked fruit was determined by the random-sample method. In obtaining these 

 samples, all the fruit on the data trees of a given plot was picked and weighed. 

 From each basket of this fruit a sample was taken at random and placed with 

 other similar samples, enough being taken from each basket to make a total of 

 one or two bushels in the total sample from each plot. This fruit was carefully 

 examined for spray injury, and the per cent found in the sample was considered 

 to be a correct representation of the fruit conditions of the plot. 



^ Plots 2 and 12 were "buffers." The applications w^ere made at the usual 

 times for controlling rot and curculio. A complete discussion of these treatments 

 and results is given in the 1911 Reports of the American Pomological Society and 

 the Pennsylvania State Horticultural Association, under the heading of "Summer 

 Spraying of Peaches." Also see our paper on "Spray Injury" given at the New 

 Jersey State Horticultural Society meeting, December 13, 1911. 



