256 State Horticultural Society. 



Question: Can disparene be used in a dry powder? 



Prof. Stedman. — It is very difficult to dry out Disparene and make 

 a dry powder of it. It comes in paste form. There is no reason why 

 the factory could not make dry powdered Disparene. 



Dr. Bird. — The trouble is getting powder fine enough to stick to 

 the tree. 



Question : Can we use dry poisons without getting them in our 

 eyes and noses? 



Secy. Goodman. — You can dust a thousand acres and not get a bit 

 upon you. 



A NEW BORDEAUX POWDER— FOR SPRAYING FRUIT 



TREES AGAINST FUNGI. 



BULLETIN NO. 6o. 



(R. M. Bird, Acting Chemist, Columbia, Mo.) 



The Department of Horticulture asked for a fine dust that might 

 be used in place of the liquid "Bordeaux Mixture" for spraying trees 

 against fungi. A powder which contains copper in the same chemical 

 state that exists in properly made liquid Bordeaux mixture can- readily 

 be prepared by following the directions given below : 



Materials required to make seventy pounds of a stock powder : Four 

 pounds of copper sulphate (blue stone) ; four pounds of good quick-lime; 

 two and a half gallons of water, in which to dissolve the copper sul- 

 phate; two and a half gallons of water, which is to be added to the 

 quick-lime; sixty pounds of air-slacked lime which has been sifted 

 through the fine sieve m.entioned below ; a box about 3x3x3 feet, into 

 which the material is sifted ; a wire sieve should have a cover. The 

 bottom should be of rather stout wire gauze having 25 or 30 meshes to 

 the inch. This sieve fits loosely between the strips on the box and can 

 be shaken back and fcrth over the opening without allowing much lime 

 dust to escape. 



A wooden frame wliich fits snugly inside the frame of the sifter 

 and is covered with fine, strainer-wire gauze having lOO meshes to the 

 inch. This makes a false bottom to the stoutly made sifter and is used 

 to separate the fine dust of the air-slacked lime and for the final sifting. 



A wooden block to rub the material through the coarse sieve; two 

 close-w^oven, cotton flour-bags — one slipped inside the other — with which 

 the blue material is filtered. 



Directions, i. Break up into small lumps about seventy or eighty 

 pounds of quick-lime and spread it out so that it will become air-slacked. 



