OCR Text |
Show CONTROL GREEN APPLE APHIS Because Tobacco Spray Kills by Suft focation It Surpasses Other Remedies Like Kerosene. (By PROF. A. L. MELANDER, Experiment Experi-ment Station, Pullman, Wash.) The tobacco sprays are particularly valuable for all kinds of aphis, including includ-ing those species affecting houBe " plants. The woolly aphis, blackberry iphis, the various specimens of green iphis, the leaf hopper, red spider. Sea beetles and young scale Insects ill can be controlled by this spray. This makes probably the best spray lor oyster shell, bark louse, and should be given for that insect as soon as Ihe young hatch, usually about June 1. Although primarily a contact spray, with tobacco spray kills by suffocation. suffoca-tion. For this reason it surpasses other contact remedies like kerosene Emulsion or whale oil soap. After an aphis has curled a leaf it Is difficult to control it with other contact remedies, because- the- aphis !b protected from such remedies, but i drip of tobacco spray on the leaf will give a fume which will prevent the breathing of the aphis, and this can be depended on, even though the leaves of the tree are badly curled. The tobacco sprays are coining more and more into general use. The aepredations of the various forms of plant lice are so great that the most Effective remedies should be made use of in controlling them. |