Thk Control oi- Ixskct Pksts and Plant Dl^rasf.s. 613 



Arsenate of lead may be added to the diluted concentrate at the rate of 2 to 3 

 pounds to 50 gallons. Do not use paris green, arsenite of lime, or arsenite of soda 

 with lime-sulfur. 



This is not a boiled solution as might be inferred from the 

 Q ., , ..J name. It is prepared by placing in a barrel 8 lbs. best stone 

 J. ., lime to which is added a small quantity of cold water to start 



it slaking. Eight pounds of sulfur worked through a sieve 

 to break up the lumps is then added slowly to the slaking lime, 

 which is kept from burning by the addition of just enough cold water so as not 

 to drown it. The slaking mixture must be stirred constantly. Just as soon as 

 the slaking is completed (which should be in 5 to 15 minutes) fill the barrel with 

 cold water (50 gals.). The mixture is strained into the sprayer tank through a 

 sieve of 20 meshes to the inch. It must be agitated constantly while being applied 

 as it settles rapidly. When properly made this is simply a fine mechanical mix- 

 ture of lime and sulfur produced by the heat and bubbling action of slaking and 

 should have but little sulfur in solution. This mixture is especially adapted for 

 the spraying of peaches and plums in foliage as it causes no injury. Arsenate of 

 lead may be added to this mixture. U. S. D. A. Bureau Pla:.it Industry Circular 

 27 and Bureau of Entomology Circular 120. 



Copper carbonate 5 oz., ammonia 3 pts., water 50 gals. Dilute 



Ammoniacal the ammonia in seven or eight parts of water. Make a paste 



copper of the copper carbonate with a little water. Add the paste to 



carbonate. the diluted ammonia and stir until dissolved. Add enough 



water to make 50 gallons. This mixture loses strength on 



standing and should be made as required. It is used in place of Bordeaux 



when one wishes to avoid the coloring of maturing fruits or ornamental plants. 



Probably it is not so effective as Bordeaux. 



If large amounts of the above mixture are required, it is more economical for 

 the grower himself to make the copper carbonate. Proceed as follows : Dissolve 

 12 lbs. of copper sulfate (blue vitriol) in 12 gals, of water in a barrel. Dissolve 15 

 lbs. of sal soda in 15 gals, of water (preferably hot). Allow the solution to cool; 

 then add the sal soda solution to the copper sulfate solution, pouring slowly in 

 order to prevent the mixture from boiling up and running over. A fine precipitate 

 which will settle to the bottom after the mixture has stood about twelve hours is 

 formed. Siphon off the clear liquid above. Wash the precipitate by adding clear 

 water, stirring, and again allowing to settle. Siphon off the clear water, strain the 

 precipitate through muslin, and allow it to dry. This is copper carbonate. The 

 above amounts will make about seven pounds. 



Potassium sulfid (liver of sulfur) 3 oz., water 10 gals. As 



. this mixture loses strength on standing, it should be made just 



fjj^'^ 1>efore using. It is particularly valuable for the powdery mil- 



SUina. jg^ j^£ rnj^ny plants, especially of gooseberry, carnation rust, 



rose mildew, etc. 



Copper sulfate i lb., water 15-25 gals. Dissolve the copper 



Copper sulfate in the water. It is then ready for use. One pound in 



sulfate. twenty gallons of water has been found effective against peach 



leaf-curl. This mixture should never be applied to the foliage, 



but must be used before the buds break. A much weaker solution has been 



recommended for trees in leaf, but it is rarely used. 



