. Circular (Pennsylvania Department of Agriculture. Bureau of Zoology.), 1918. Agricultural pests; Agriculture. \ 20 Dissolve the soap in the water, remove from fire. Add the kerosene, and agitate violently until a creamy white emulsion is formed, which thickens like gelatin when cold. For spraying dilute with eight to ten parts of water, and stir thoroughly. 8. Powdered tobacco will destroy root aphis, ahd certain other pests like earthworms and slugs, if a handful is piled at the base of plants, where water leaches out the poison, and carries it downward. Beneficial for potted plants. REPELL
. Circular (Pennsylvania Department of Agriculture. Bureau of Zoology.), 1918. Agricultural pests; Agriculture. \ 20 Dissolve the soap in the water, remove from fire. Add the kerosene, and agitate violently until a creamy white emulsion is formed, which thickens like gelatin when cold. For spraying dilute with eight to ten parts of water, and stir thoroughly. 8. Powdered tobacco will destroy root aphis, ahd certain other pests like earthworms and slugs, if a handful is piled at the base of plants, where water leaches out the poison, and carries it downward. Beneficial for potted plants. REPELLENTS. 9. Powdered slaked lime and powdered tobacco are good repellents, driving away many insects, but not necessarily killing them. Sifted lime and plaster of paris are good "carriers" for dry lead arsenate or paris green. Any material with an odor of tobacco, kerosene, tar, carbolic acid, camphor or napthaline acts as a repellent for insects, but rarely kills them. FUMIGANTS. 10. Carbon disulfide is a clear, ill-smelling liquid which evaporates rapidly. The vapor is much heavier than air, and is explosive. It is, an excellent and safe fumigant for weevil-infested seeds. Use a tablespoonful to each cubic foot of space in a tight can or box, and fumigate for a day or two. Keep away lights. Warning.—Many proprietary mixtures are on the market for controlling insects and plant diseases, but none are better than the common materials recom- mended in this circular, except that one pays more for the same material, or for a lot of useless Small Amt 3 gallons i lb. 3 gallons 21 CONTROLS FOR PLANT DISEASES. 11. Bordeaux mixture (pronounced bor-do) is the standard spray for control of fungus diseases of truck crops, mildew on roses, grapes, etc. It is also used in fruit tree spraying exten- sively; but under certain conditions, has been replaced by lime-sulfur solution. Quantity Copper sulfate (blue-stone) 4 lbs. Quicklime - - " * ^^^; Water . - - 50 gallons In
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