Primary tabs
Transcription
MAY 1, 1894.] THE AUSTRALIAN VIGNERON A
Late Recipe for Bordeaux Mixture.
––––––
American Gardening gives the following from Professor
Beach, of the Geneva, N.Y., Experiment Station, relative to the preparation of the Bordeaux mixture :
"Professor Beach advises to dissolve 4 pounds of copper
sulphate in water, nearly filling a 45 gallon cask. Next make a whitewash or cream of freshly slacked lime. Have on hand a small bottle containing a saturated solution of yellow prussiate of potash (ferro-cyanide of potassium) in water. As you add the lime to the copper sulphate water, apply the test from time to time by adding a drop from the small bottle. As long as you notice a change of color in the mixture, more lime must be added. When further addition of the drug ceases to change the color, the mixture contains lime enough. The necessity of straining can be avoided by using only the clear milk of lime, not the settlings. Freshly slacked lime is always to be preferred. It sticks better, and it does not take so much time. Its object is simply to neutralize the acid in the sulphate. The mixture must be constantly stirred while being applied. For close work there is no better spraying nozzle than the Vermorel. A bamboo extension may be used with which to get the nozzle into the tree. A weak mixture put on thoroughly is better than a strong mixture applied in a haphazard way. Experiments have shown the Bordeaux mixture to be the best fungicide yet tested."––Californian Fruit Grower.
––––––––––––––––––––––––