FOURTEENTH ANNUAL MEETING. 151 



seemed to improve the efficiency of K-L considerably. It 

 made the mixture spread better, adhere better and kill some- 

 what better than plain K-L. There was also a tendency to 

 increased foliage injury when rosin soap was used, but not 

 enough to condemn it. 



To make rosin soap place 3 pounds of sal soda and 6 

 pounds of rosin in 4 gallons of water. Heat this to the boiling 

 point, stir almost constantly, and continue the boiling at least 

 one hour. Add water to replace that lost by boiling so as to 

 make 4 gallons of rosin soap. 



One quart of this is sufficient for 50 gallons of K-L. When 

 this soap is added to Bordeaux or K-L mixture, the sal soda 

 in the soap unites with the lime in the Bordeaux or K-L, 

 forming caustic soda, which will mjure foliage if used too 

 liberally. 



Bordeaux mixture is a splendid adhesive and is to be com- 

 mended when the fruit grower is spraying for fungous dis- 

 eases as well as for San Jose scale or other sucking insects. 

 K-L with it has proved very efficient. 



Copper sulphate is perhaps the best adhesive tried, but 

 for some unknown reason the K-L prepared with it is not 

 always efficient in killing scale. Why it is that Bordeaux 

 mixture and K-L are efficient and copper sulphate and K-L 

 are not always so, the speaker cannot explain. 



Salt is supposed to increase the adhesiveness of the lime- 

 sulphur-salt wash, so it was tried v^ath K-L. In the chemical 

 union between lime and salt, caustic soda was formed which 

 destroyed much of the foliage within a few hours. Salt can- 

 not be used during the growing season, although it is desirable 

 during the dormant season, one pound to 5 gallons of mixture. 



Caustic soda, one pounds to 12 gallons of K-L, makes a 

 most satisfactory smooth and effective mixture for use during 

 the dormant season. A few days after spraying this discol- 

 ors to a rusty brown. The objection noted was a caustic 

 action on the hands and face when the spray struck them. 

 Caustic soda increases the expense somewhat, but perhaps a 

 smaller amount than one pound to 12 gallons will be effective. 



Sulphur was tried in different ways and it absorbs kero- 

 sene readily, but, when water is added, sticky disagreeable 

 clots are formed which make the mixture unsatisfactory. 



