. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 56 MASS. EXPERIMENT STATION BULLETIN 202. Hammond's Copper Solution, a commercial preparation which has been used by florists in attempts to control greenhouse rusts, was next tested. The stock solution as purchased was analyzed by Mr. T. 0. Smith, assistant chemist at the New Hampshire Agricultural Experiment Sta- tion, and found to contain gms. copper in 1 of solution. The manufacturers recommended that it be applied at the rate of 1 quart of the stock solution to 25 gallons of water, that is
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 56 MASS. EXPERIMENT STATION BULLETIN 202. Hammond's Copper Solution, a commercial preparation which has been used by florists in attempts to control greenhouse rusts, was next tested. The stock solution as purchased was analyzed by Mr. T. 0. Smith, assistant chemist at the New Hampshire Agricultural Experiment Sta- tion, and found to contain gms. copper in 1 of solution. The manufacturers recommended that it be applied at the rate of 1 quart of the stock solution to 25 gallons of water, that is, a solution containing per cent copper. The results of the tests are given in Table 9. Table 9. — Effect of Varwis Strengths of Hammond's Copper Solution on the Germination of the XJrediniospores of P. Antirrhini. Per Cent Copper. Germination relative to Check, Remarks. , , , , , , , I Mean of Mean of Mean of Mean of Mean of Mean of Mean of three experiments, three experiments, three experiments, three experiments, three experiments, three experiments, three experiments. It is evident that Hammond's Copper Solution, even when used at ten times the recommended strength, does not prevent germination of urediniospores of P. Antirrhini. In connection with this work the action of Hammond's Copper Solution on carnation rust was also tested, and at the recommended strength it was not toxic, the germination of the urediniospores of U. Canjophyllinus (Sehrank) Wint. relative to check, 100, being 56. Bordeaux mixture was next tested. The Bordeaux mixture used contained copper sulfate and calcium oxide in the approximate ratio of 1 : ; that is, calcium oxide was added to slight alkalinity. This formula was used for the sake of convenience, but the same results would be obtained with any current formula, for the unit copper is equally toxic in acid, neutral and alkaline Bordeaux mixtures (Butler, 1915). The Bordeaux mixture used in the tes
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