Extension Bulletin Volume 41-66 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ... or from breeding cages kept in unnatural conditions. c. To date the third spraying, keep some trees banded with strips of burlap tied around the trunks. Watch for worms two to three weeks after the second spraying and date the third application twenty-five days after the first worms are caught. At Yakima this spraying will be given about July 20. d. The number of worms trapped by the bands gives an indication of the effectiveness of the spraying for the first brood and of the need for later sprayings. Thinning wormy fruit during the time of the first brood is of great value in checking the pest and also helps in deciding whether late sprayings are necessary. When the first brood is annihilated late spraying is a needless expense. c. The fourth spraying should follow four weeks after the third, and, if necessary, the fifth four weeks later. f. If these applications have been carefully given, no good can come from additional sprayings. It should be remembered that cover sprayings can never be depended on to give 100 per cent returns. At best they are an expensive supplement to the calyx spraying. 5.--Cover Sprayings Should Be Quick Acting a. Use arsenate of lead, one to two pounds of paste, or half as much powder, to about forty gallons. Increasing the strength of the spray over this amount will not save more fruit. b. Where there is no danger of scorching use arsenite of zinc or arsenate of calcium for late sprayings of badly-infested orchards. These arsenicals act more quickly than arsenate of lead and hence tend to minimize stings. c. Spray from the ground, best using the spraying-gun with power pump, and do not overdo the application. There is no need of having the trees drip poison onto an alfalfa cover crop to endanger bees and stock. If you lost your ...