, ORCHARD SPRAYING EXPERIMKNT.S. 55 



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 was high grade 

 and quick acting. Sulphur flour was used.* 



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 

 and straining it showed a density indicated in the table and was 

 used at the same dilution as the commercial solutions. 



Arsenate of lead was not added in any case until the time of 

 application. 



Time; of Appucation. 



Owing to the nature of the experiment, a hand pump outfit 

 was used. The applications, made with Mistry Jr. nozzles, were 

 exceedingly careful and thorough, and occurred on the follow- 

 ing dates : 



ist. When fruit buds began to show pink, May 13 to 16. 



2nd. After the petals fell, June 7 to 9. 



3rd. July 15 to 18. 



Weather Conditions During and Following Spraying. 



Weather conditions at the time of the first application were 

 most favorable. The days were bright, mild and warm, and 

 remained so for at least a week after spraying. 



The second application was interrupted and followed by 

 weather of the kind most favorable for the production of spray 

 injury, according to previous experiences with bordeaux mix- 

 ture. Showers interrupted and followed the spraying. The 

 temperature and humidity changes were great and sudden. Cold, 

 rainy periods were followed by bright, hot, humid ones. Un- 



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

 in reality not the "self- boiled" preparation of Scott's recommendation, 

 but an intensiRcd modification, whereby more sulphur than Scott ad- 

 vises goes into solution. In making the self-boiled mixture the direc- 

 tions at the end of this bulletin should be followed. 



