72 Report of State Board of Horticulture, 



prevails at the time of the first sDrayino- after the blossoms fall, and 

 as such conditioBs do usually thus nrevail, at least in the Willamette 

 Valley, "spray injury" following the use of Bordeaux often becomes 

 almost as serious as the fungous injury it was expected to prevent. 



LIME-SULPIIUR SOLUTION. 



One application of lime-sulphur spray each winter 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 destroys the branch form of woolly-aphis, 

 the eggs of the green-aphis, the pear-leaf blister mite, the hiber- 

 nating larvffi of the prune twig-minor, probably the hibernating 

 larvffi 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 pre- 

 ventive of apple-tree anthracnose ; applied to peach trees just before 

 the buds open in spring it is a oreventive of peach-leaf curl. The 

 results of the past three seasons' work at the Oregon Experiment 

 Station also show that when diluted it can be used as a substitute 

 for Bordeaux mixture for spring and summer spraying with exceed- 

 ingly good results. 



There are two methods of preparing the lime-sulphur spray. The 

 formula which has been most generally used in this Stai:e 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 deej), blood-red color with 

 but little free sulphur on the surface. Add water to make 150 

 gallons. 



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 uoon the market a number of brands 

 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 destroy- 

 ing 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 Avith these commercial preparations 

 is that they cost too much. The retail price is $9 to $12 per barrel 

 of fifty gallons. The lime and suli)hur necessary to prepare fifty 

 gallons of stock solution which is equally as efficient costs at present 

 retail prices approximately $3. It may be prepared as follows: 



Sulphur (best finely ground), one sack 110 pounds 



Lime (best grade, unslacked) 60 pounds 



Water, sufficient to make 60 gallons 



