. Fig, 52.—Frost ring on young pears. the bark. The bark should be thoroughly wet, and with rough bark it is desirable to remove the outer scales before the application is made. The most satisfactory strength of solution should be determined by trial in the individual orchard. The prospective user should consult Extension Circular 20 or 45 (now out of print) if a copy is available.^^ This method 2'Zinc chloride solutions are composed of zinc chloride dissolved in a solvent consisting of 7 pints of denatured alcohol, 2 pints of water, and 3 ounces of hydro- chloric acid, making approximately 9
. Fig, 52.—Frost ring on young pears. the bark. The bark should be thoroughly wet, and with rough bark it is desirable to remove the outer scales before the application is made. The most satisfactory strength of solution should be determined by trial in the individual orchard. The prospective user should consult Extension Circular 20 or 45 (now out of print) if a copy is available.^^ This method 2'Zinc chloride solutions are composed of zinc chloride dissolved in a solvent consisting of 7 pints of denatured alcohol, 2 pints of water, and 3 ounces of hydro- chloric acid, making approximately 9 pints of solvent. It must be prepared in glass or enamelware and stored in tightly corked bottles. The solution is poisonous to animals. 9 pounds of zinc chloride in 9 pints of solvent makes a 52 per cent solution. 6 pounds of zinc chloride in 9 pints of solvent makes a 43 per cent solution. 4 pounds of zinc chloride in 9 pints of solvent makes a 33 per cent solution. The solutions may also be prepared by first dissolving the zinc chloride in the 2 pints of water by boiling, then adding the acid, and lastly pouring this mixture into the denatured alcohol. Another method of preparing the weaker solutions is to dilute the stronger solu- tion with the solvent or with denatured alcohol. 28 Day, L. H. Pear blight in California. California Agr. Ext. Cir. 20:1-40. 17 figs. 1928. (Out of print.) Day, L. H. Zinc chloride treatment for pear blight cankers. California Agr. Ext. Cir. 45:1-13. 1930. (Out of print.) These may be consulted at many city and county libraries in California that have the Experiment Station publications on file.
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