2 MAINE AGRICULTURAL EXPERIMENT STATION. I912. 



The results of the spraying experiments of the season of 

 19 10 have already been published ■■'• and will be but briefly 

 reviewed here. 



EXPERIMENTS AT HIGHMOOR FARM ipio. 



"The experiment aimed at determining the following points : 



1. The comparative efficiency of the lime-sulphur sprays 

 and bordeaux mixture as fungicides, especially for apple scab. 



2. A comparison of these sprays in regard to possible in- 

 jury to foliage and fruit on a variety especially susceptible to 

 spray injury — the Ben Davis. 



3. The effectiveness of arsenate of lead in combination witn 

 lime-sulphur solutions. 



4. The relation of possible leaf and fruit injury to the com- 

 bination of sulphur sprays with lead arsenate 



An orchard of 140 Ben Davis trees from 20 to 25 years old, 

 of fairly uniform size and condition, and' promising a moderate 

 yield per tree, was divided into 12 plots. Plot i contained 9 

 trees. The remainder consisted of 12 each, excepting Plot 9, 

 which contained ii.** 



The table on page 3 gives data of treatment : 



In making the self-boiled lime-sulphur, hot water was used 

 and an attempt made to secure a large amount of sulphur in 

 solution by making it in a small lo-gallon cask, conserving the 

 heat by a covering during the process, and allowing it to stand 

 for about 45 minutes before using. The lime wa^, high grade 

 and quick acting. Sulphur flour was used, t 



The lime of the boiled concentrated spray was slaked with a 

 thin paste made of the sulphur in hot water, more water being 

 added up to a total volume of 10 gallons. This volume was kept 

 constant while the solution boiled for one hour. After cooling 



* Bonns, W. W., "Orchard Spraying Experiments," Bui. 189, Me. Agr. 

 Exp. Sta., pp. 33-80, PI. XII. Inasmuch as the size of the edition 

 proved somewhat inadequate it has been considered desirable to brief- 

 ly review the account of the work and the results contained therein. 



** Two trees in Plot 12 were accidently sprayed on one side in the 

 second application and were omitted from the final count. 



t It should be noted that the above method of making this mixture 

 is m reality not the "self-boiled" preparation of Scott's recommenda- 

 tion, but an intensified modification, whereby more sulphur than Scott 

 advises goes into solution. Concerning the self-boiled mixture see Ap- 

 pendix B of this bulletin, p. 32. 



