16 EXPERIMENT STATION BULLETIN. 



with sulphur dust, lime-sulphur, Sherwin-Williams dry lime-sulphur, 

 Dow dry lime-sulphur and B. T. S. The dry lime-sulphurs and B. T. S. 

 are not applied as a dust, but are dissolved in water and applied as 

 any other spraying material. This orchard is about fifteen years old 

 and is on the fruit farm belonging to Mr. J. C. Maynard. It is located 

 about two miles west of Grand Rapids. There is a number of Wealthy 

 trees in the orchard but they were not used for experimental purposes. 



Materials. The orchard was divided into eight plots as shown in 



Chart V. The plots were treated as follows: 



Plot 1. Dusted. 3 in 1 and 90-10 mixtures. 



Plot 2. Sprayed. Lime-sulphur solution 1 to 40. 



Plot 3. Sprayed. Sherwin-Williams dry lime-sulphur, 3 Ibs. in 50. 



Plot 4. Sprayed. Sherwin-Williams dry lime-sulphur, 5% in 50. 



Plot 5. Sprayed. Dow dry lime-sulphur, 3 Ibs. in 50. 



Plot 6. Sprayed. Dow dry lime-sulphur, 5% Ibs. in 50. 



Plot 7. Sprayed. B. T. S., 4 Ibs. in 50.* 



Plot 8. Sprayed. B. T. S., 1 Ibs. in 50. 



Lead arsenate (dry) at the rate of 1*4 pounds in 50 gallons was used 

 with all spraying materials for all applications. Black Leaf 40 was 

 used on all sprayed plots for the first application. 



The dry lime sulphurs and B. T. S. were used at two rates. First, 

 at the maximum rate recommended by the manufacturers for summer 

 sprayed of apples, and second, at the strength which gives about the 

 same amount of actual sulphur as is contained in one and one-fourth 

 gallons of lime-sulphur solution, testing 32 degrees Beaume. The rea- 

 son for using these materials at the increased strength has been stated 

 on page 13. 



Applications. Three applications were made. The August applica- 

 tion was omitted as the fruit was nearly ripe at that time. They were 

 made at the periods listed below: 



1st. Cluster or pink application. 



2nd. Calyx application. 



3rd. Two weeks after second. 



The dusting was done with a large power duster. Dusting material 

 was always applied from two directions. The foliage was usually dry 

 when the work was done. The 3 in 1 mixture was used for the first 

 application and the 90-10 mixture was used for the second and third. 

 The spraying was done with spray guns and when the foliage was dry. 



RESULTS 



Foliage Injury. The foliage of the dusted trees was in excellent 

 physical condition. Early in the season a little scab was found but this 

 did not develop further. All sprayed trees showed a small amount of 

 foliage injury and the leaves did not have the same clean, bright appear- 

 ance as on dusted trees. The injury was not severe. There was no 

 noticeable difference in the amount of injury in the different sprayed 

 plots. 



*B. T. S. is manufactured by the General Chemical Company. The letters are the Initials 

 of the words "barium tctra-sulphide." This is the chemical name of the material. 



