388 Fruit-growing in Arid Regions 



able results from the use of a self-boiled lime-sulfur mixture. It 

 is made as follows : Place 15 pounds of fresh stone lime in a 50- 

 gallon barrel, and pour two or three gallons of cold water over it. 

 Immediately add the sulfur and another pail of water. Stir as 

 necessary, to prevent burning and add more water if the mass 

 gets too thick to stir; but as little water as possible should be 

 used. When the boiling ceases, dilute with water to make 50 gal- 

 lons, stir thoroughly, strain, and the mixture is ready for use. 



The Rex preparation has given good results in our experiments 

 in controlling grape mildew, so that there is no doubt but that 

 the self-boiled mixture should give equally as good and perhaps 

 better results. 



Tobacco. Tobacco has long been used in one way or another 

 for the destruction of insects. Its chief use seems to be for the 

 destruction of lice. When slowly burnt, the smoke may be utilized 

 for the destruction of lice on plants in greenhouses or window 

 gardens. In the form of a fine dust it is often effectual in ridding 

 plants of flea-beetles, and in the form of dust or stems is one of 

 the best remedies we have for woolly aphis on the roots of apple 

 trees. 



A decoction made by boiling tobacco dust or stems in water, 

 in the proportion of a pound to three or four gallons, is destructive 

 to plant lice and to lice upon cattle. Tobacco very finely powdered 

 may also be used in the dry form against the same insects. It is 

 best to first spray the insects with water. 



Bordeaux Mixture. Formula A. 



Copper sulfate (blue stone or blue vitriol) .... 4 pounds 



Quick lime 4 pounds 



Water 45 gallons 



Formula B. 



Copper sulfate 2 pounds 



Quick lime 4 pounds 



Water 45 gallons 



Only fresh unslaked lime should be used. It should be slaked 

 in water in a separate vessel, diluted to a thin whitewash, and 



