282 DISEASES OF TROPICAL PLANTS CH . 



good sulphur fungicidal compounds, one known as 

 self-boiled lime sulphur, and the other as commercial 

 or boiled lime sulphur. The first is used upon plants 

 that have a very delicate foliage, while the second can 

 be used upon plants where foliage or fruits are not easily 

 injured by fungicides. 



Self-Boiled Lime Sulphur. 



Caustic lime (unslaked) . 8 Ibs. 



Flowers or Flour of Sulphur . 8 Ibs. 

 Water 50 gallons. 



Place the lime into a barrel or other convenient 

 receptacle. Start to slake with cold water. Add the 

 sulphur, which has previously been made into a paste 

 with a little cold water, and cover the barrel up at once 

 with either a wooden cover or some coarse sacking in 

 order to hold the heat. Usually it will be necessary to 

 add two or three gallons of cold water when the slaking 

 is most vigorous. Keep the mixture well stirred through- 

 out the operation. When all boiling has ceased add 

 enough water to make up to fifty gallons, and carefully 

 strain into the spray tank. Work all the free sulphur 

 possible through the strainer. If larger or smaller 

 amounts are desired use proportionate parts or multiples 

 of the above formula, and proceed in the same manner. 

 Sometimes it will be found necessary to start the lime 

 to slaking with hot water. A mixture made with hot 

 water will be found to be much more caustic upon foliage 

 than one made with cold. 



Arsenate of lead or arsenate of lime may be used 

 with this spray as an insecticide ; but Paris green 

 should not be used in connection with any of the lime- 

 sulphur mixtures. 



Boiled Lime Sulphur. This material has been used 

 for a number of years as an insecticide for scale insects 

 upon dormant trees. However, it has been found that 

 it is an efficient remedy for many plant diseases, and 

 can be applied to a large number of trees in full leaf if 

 proper dilutions are made. 



