Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 APPENDIX B INSECTICIDES AND FUNGICIDES 1. The Governing Principles in the use of insecticides and fungicides were given in Chapters 21, 22 and 23. Below, brief directions for making the most generally used mixtures are given. More detailed information may be secured from your State Agri- cultural Experiment Station or the U. S. Department of Agriculture, or manufacturers of spraying machinery. 2. Copper Sulfate Solution. Soluble copper salts are ver
Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 APPENDIX B INSECTICIDES AND FUNGICIDES 1. The Governing Principles in the use of insecticides and fungicides were given in Chapters 21, 22 and 23. Below, brief directions for making the most generally used mixtures are given. More detailed information may be secured from your State Agri- cultural Experiment Station or the U. S. Department of Agriculture, or manufacturers of spraying machinery. 2. Copper Sulfate Solution. Soluble copper salts are very poisonous to fungi and algae in even very dilute solution. They are only moderately so to higher plants and animals. There is no case on record of anyone becoming poisoned from eating fruit sprayed with copper salts. Because of its cheapness copper sulfate is most generally used for fungicide solutions. When used to spray plants in leaf it is necessary to add lime to neutralize the scorching acid effect on the leaves and to give the mixture adhesive quahty. For spraying dormant trees it is used without the lime, as follows: Copper sulfate, (Blue Stone) 3 pounds Water 50 gallons 3. Bordeaux Mixture is the most generally used fungicide. The standard formula is 4 pounds of copper sulfate, 4 pounds of fresh lime and 50 gallons of water, and is usually referred to as the 4-4-50 formula. The pro- portions are varied for special purposes, as 3-9- 50 for peach trees which have delicate foliage. In preparing, use two half-barrels, as shown in Fig. 230. The copper sul- fate should be pulverized and put into a coarse burlap sack and sus- pended in water until dis- Fig. 230. Making Bordeaux mixture. solved. By Using warm (368)
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