58 Report of State Board of Horticulture. 



so used it is at once an efficient contact insecticide, food poison 

 spray, and fungicide. 



It has also the advantage that when properly diluted it 

 may be used either as a winter or summer spray. 



As a winter spray one application of lime-sulphur spray 

 each year will do more for the neglected orchard than can 

 be done in any other way by the same expenditure of cash 

 and energy. It not only destroys San Jose scale, but it also 

 apparently destroys the branch form of woolly-aphis, the eggs 

 of the green-aphis, the pear-leaf blister mite, the hibernating 

 larvse of the prune twig-miner, together with some other 

 inseets 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 anthrac- 

 nose; 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 f ollows : 



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 few 

 years. During that time there have appeared upon the market 

 a number of concentrated lime-sulphur Solutions, which have 

 only to be diluted with water to be ready for use. Careful 

 experiments extending over three seasons have demonstrated 

 that these sprays are fully equal to the old home-made lime- 

 sulphur spray in destroying Sem Jose scale. Whether all of 



