. Bulletin. Agriculture; Agriculture -- Arizona. 264 Bulletin 38. young trees, and is now very widely distributed in the apple orch- ards. It has two forms, one which lives on the branches of the trees, the other upon the roots. The former, although naturally the most conspicuous, is much the least harmful. Many experiments have been made for the destruction of the woolly louse of the apple, and the results are well summarized by Mr. C. L. Marlatt in Circular 20, Division of Entomology, Fig. 4. Woolly louse of the apple.—a, Agamic female; 6, young louse; c, pupa; d. winged female, w
. Bulletin. Agriculture; Agriculture -- Arizona. 264 Bulletin 38. young trees, and is now very widely distributed in the apple orch- ards. It has two forms, one which lives on the branches of the trees, the other upon the roots. The former, although naturally the most conspicuous, is much the least harmful. Many experiments have been made for the destruction of the woolly louse of the apple, and the results are well summarized by Mr. C. L. Marlatt in Circular 20, Division of Entomology, Fig. 4. Woolly louse of the apple.—a, Agamic female; 6, young louse; c, pupa; d. winged female, with antenna enlarged above. All greatly enlarged, and with the waxy secretion removed. (Marlatt, Circular 20, 2nd Series, Div. Entomology, U. S. Dept. Agriculture). The form which occurs on the branches can be killed by a spray of kerosene emulsion or soap wash, best applied warm. It can also be destroyed by applying kerosene to the colonies by means of a paint brush. This should be done, if possible, early in the year. The root form is not so easily got rid of, but the following remedies have succeeded : i. Hot water may be applied about the roots of the trees, the surface soil having been first removed. 2. Finely ground tobacco dust may be applied about the base of the trees, first removing the soil to a depth of 4 to 6 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of Arizona. Agricultural Experiment Station. Tucson : Agricultural Experiment Station, University of Arizona
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