. An annotated list of the important North American forest insects. Forest insects. SPRAYING THE TRUNKS AND BRANCHES TO KILL THE YOUNG LARV^. Experiments have demonstrated that the hibernating larvse maj' be killed by spraying the trunks and branches with a strong solution of kerosene emulsion. Therefore, when it is practicable or more desirable to adopt this method for the protection of small plantations, groves, or shade trees, the spraying should be done in the fall or winter, not earlier than November 1 and not later than April 1, or, in other words, during the dormant period of the tree.
. An annotated list of the important North American forest insects. Forest insects. SPRAYING THE TRUNKS AND BRANCHES TO KILL THE YOUNG LARV^. Experiments have demonstrated that the hibernating larvse maj' be killed by spraying the trunks and branches with a strong solution of kerosene emulsion. Therefore, when it is practicable or more desirable to adopt this method for the protection of small plantations, groves, or shade trees, the spraying should be done in the fall or winter, not earlier than November 1 and not later than April 1, or, in other words, during the dormant period of the tree. The following paragraphs explaining the preparation of the kerosene emulsion are taken from Farmers' Bul- letin No. 127 of this Department, by Mr. C. L. Marlatt: Kerosene emulsion (soap formula)— Kerosene 2 Whale-oil soap (or 1 quart soft soap) pound., \ Water - 1. Fig. 3.—The locust borer (Cyllene robinia'): a, male beetle: 6, female beetle. Much enlarged (author's illustration). The soap, first finely divided, is dissolved in the water by boiling and imme- diately added boiling hot, away from the fire, to the kerosene. The whole mixture is then agitated violently while hot by being pumped back upon itself with a force pump and direct discharge nozzle throwing a strong stream, preferably one-eighth inch in diameter. After from three to five minutes' pumping the emulsion should be perfect, and the mixture will have increased from one-third to one-half in bulk and assumed the consistency of cream. Well made, emul- sion will keep indefinitely and should be diluted only as wanted for use. For the treatment of large orchards or in municipal work requiring large quantities of the emulsion, it will be advisable to manufacture it with the aid of a steam or gasoline engine, as has been very successfully and economically. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
