26a EXPERIMENT STATION. [Jan. 



results of over 1,500 separate observations on spray injury. 

 This will be published as a station bulletin as soon as oppor- 

 tunity allows. 



Project 12. "Determination of the best strength of lime- 

 sulfur." 



Assistant Professor Bourne. 



Work on this ])r()ject was commenced in the sprin<^ of 1921. 

 Results as yet are purely tentative. 



Project 13. "Study of the possible injurious effects of 

 Scalecide on trees." 



Assistant Professor BouRXE. 



This project requires a study of the cumulative effect of this 

 spray. Work was commenced in the spring of 1921 with ap- 

 plication of one dormant spray. Final report cannot be made 

 until the fact of injury, or of no injury, be established. 



Department of Pomology. 



Project 11. "To test new spray materials as they become 

 commercially important." 



Professor Sears and Assistant Professor Gould. 



This project was co-operative between the Department of 

 Pomology and the Departments of Botany, Entomology and 

 Plant and Animal Chemistry'. The following materials were 

 tested in 1921: — 



Sulco V. B. (1920 and 1921 material). 

 Grasselli Lime Sulfur paste. 

 NuRexo Bordeaux jjowder. 



These were tried in comparison with dry lime-sulfur and 

 liquid lime-sulfur. All were used with arsenate of lead. The 

 bud pink and calyx sprays were applied to several varieties, 

 including Baldwins and Mcintosh. All sprays, even the 

 arsenate of lead alone, caused some burning of the foliage, but 

 this was most serious where Sulco V. B. was used. The lime- 

 sulfur paste was in poor mechanical condition, and there was 

 considerable injury from the Bordeaux powder. 



