Sprays and Spraying. 67 



of the prune twig-miner, probably the hibernating larvse 

 of the bud-moth, together with most other insects which may 

 Chance to be wintering upon the trees. It is also a good 

 fungicide. If applied in fall it is nearly or quite equal to 

 Bordeaux as a preventive of apple-tree anthracnose; applied 

 to peach trees just before the buds open in spring it is a 

 preventive of peach-leaf curl. 



As a summer spray the results of the past five seasons* 

 work at the Oregon Experiment Station prove conclusively 

 that when properly diluted it can be safely used upon the 

 apple, pear, plum and prune, potato, celery and other hardy 

 plants, and that it gives better results in Controlling apple 

 scab than does Bordeaux, which has been the Standard spray 

 for this disease, and further that it does not produce the dis- 

 astrous "spray injury" to the fruit which is so common and 

 often serious when Bordeaux is used. 



There are two methods of preparing the lime-sulphur 

 spray. The formula which has been most generally used in 

 this State is as follows: 



Quick lime 50 pounds 



Sulphur 50 pounds 



Water 150 gallons 



Slake the lime thoroughly, add the sulphur, and boil briskly 

 for at least an hour or until the mixture is of a deep blood- 

 red color with but little free sulphur on the surface. Add 

 water to make 150 gallons. Apply with considerable force 

 through a coarse nozzle. 



The "stock Solution" method which is now most generally 

 used in this State has been developed during the past three 

 years. During that time there have appeared upon the mar- 

 ket a number of concentrated lime-sulphur Solutions, which 

 have only to be diluted with water to be ready for use. Care- 

 ful experiments extending over three seasons have demon- 

 strated that these sprays are fully equal to the old home- 

 made lime-sulphur spray in destroying San Jose scale. 

 Whether all of them can safely be used for summer spraying 

 is yet to be demonstrated. 



The Chief fault to be found with these commercial prepar- 

 ations is that they cost too much. The retail price is $9.00 

 to $12.00 per barrel of 50 gallons. The lime and sulphur 

 necessary to prepare 50 gallons of stock Solution which is 

 equally as efficient costs at present retail prices approximately 

 $3.00. It may be prepared as follows : 



Sulphur (best finely ground) one 



sack 110 pounds 



Lime (best grade, unslaked) 55 pounds 



Water, sufficient to make 60 gallons 



