. The principles of agriculture, a text-book for schools and rural societies . re dor-mant,—late in the autumnafter the leaves have fallen,,or early in the spring before Fig. 73. Disease of cucumber leaf, the dyingthe buds swell. margin indicating that the trouble is due 299«. Bordeaux mixture to some cutting-oflf of the food supply,is the standard fungicide. It is made of copper sulfate, 5 lbs.;stone lime or quicklime (unslaked), 5 lbs.; water, 50 gals. Thestrength varies according to the plant to be sprayed. Bordeauxmaybe prepared in the following way: Copper sulfate.—Dissolve the required a
. The principles of agriculture, a text-book for schools and rural societies . re dor-mant,—late in the autumnafter the leaves have fallen,,or early in the spring before Fig. 73. Disease of cucumber leaf, the dyingthe buds swell. margin indicating that the trouble is due 299«. Bordeaux mixture to some cutting-oflf of the food supply,is the standard fungicide. It is made of copper sulfate, 5 lbs.;stone lime or quicklime (unslaked), 5 lbs.; water, 50 gals. Thestrength varies according to the plant to be sprayed. Bordeauxmaybe prepared in the following way: Copper sulfate.—Dissolve the required amount of copper sul-fate in water in the proportion of one pound to one gallon severalhours before the solution is needed; suspend the copper sulfatecrystals in a sack near the top of the water. In ease large quan-tites of stock solution are needed, two pounds of copper sulfatemaybe dissolved in one gallon of water. Lime.—Slake the limein a tub or trough. Add the water slowly at first, so that the limecrumbles into a fine powder. If small quantities of lime are used,. 178 THE PKINCIPLES OF AGKIOULTURE hot water is preferred When completely slaked, or entirely-powdered, add more water. When the lime has slaked sufficiently,add water to bring it to a thick milk, or to a ceitain number ofgallons. The amount required for each tank of spray mixture canbe secured approximately from this stock mixture, which shouldnot be allowed to dry out. To 7)iake Bordeaux.—Use 5 gallons ofstock solution of copper sulfate for every fifty gallons of Bordeauxrequired. Pour this into the tank. Add water until the tank isabout two-thirds full. From the stock lime mixture take the re-quired amount. Dilute this a little by adding water, and straininto the tank. Stir the mixture, and add water to make the re-quired amount. It is preferable to dilute the copper sulfate solu-tion. Never pour together the strong stock mixtures and diluteafterward. The ferrocyanide test.—It is not necessary to weig
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