Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 364 Elementary Principles of Agriculture 543. Spraying. The principal fungus diseases to be prevented in the case of the apple are scab, apple blotch, bitter rot and black rot. The insects affecting the apple most seriously are codling moth (Fig. 101) curculio (Fig. 95), San Jose scale (pronounced san ho-sa') (Fig. 100), and in some sections the woolly aphis and leaf aphis. The combination sprays usually applied are as follows: Fig. 228. B. To co


Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 364 Elementary Principles of Agriculture 543. Spraying. The principal fungus diseases to be prevented in the case of the apple are scab, apple blotch, bitter rot and black rot. The insects affecting the apple most seriously are codling moth (Fig. 101) curculio (Fig. 95), San Jose scale (pronounced san ho-sa') (Fig. 100), and in some sections the woolly aphis and leaf aphis. The combination sprays usually applied are as follows: Fig. 228. B. To control apple scab spray with Bordeaux mixture just before the ckister buds open. A. The time for effective spraying with arsenate of lead to control the codling moth is just after the petals have fallen. Courtesy Department of Horticulture, Purdue University. 1st, Dormant Spray. When the trees are dormant, lime- suKm- wash or sokible oils may be used if scale insects are present. If serious fungus conditions are threatened, spray with copper sulfate solution. (See Fig. 102.) 2d. Cluster Spray, given just as the cluster buds open, but before the blossoms have opened (Fig. 22Sa). Use Bordeaux mixture for apple scab, black rot, and if canker worms are threatened add two pounds of arsenate of lead to the Bordeaux mixture.


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