The California fruits and how to grow them; . r fumigating buildings and the like, i ounce of cyanide to each 100 cu-»ft. of space for one hour or more. For use against scaleson citrus trees. Ordinary dosage in ounces,foundby multiplying distance around by distance over top of tented tree and pointingoff two places. Example: Distance around bottom, 40 ft. X Distance over top, 20 ft. = oz. cyanide. 15. Carbon Bisulphide: For the fumigation of stored products and underground insects, and forsquirrels. Usual dosage, i pint to 1,000 cu. ft. of space. Place liquid in saucers or shallow vessels
The California fruits and how to grow them; . r fumigating buildings and the like, i ounce of cyanide to each 100 cu-»ft. of space for one hour or more. For use against scaleson citrus trees. Ordinary dosage in ounces,foundby multiplying distance around by distance over top of tented tree and pointingoff two places. Example: Distance around bottom, 40 ft. X Distance over top, 20 ft. = oz. cyanide. 15. Carbon Bisulphide: For the fumigation of stored products and underground insects, and forsquirrels. Usual dosage, i pint to 1,000 cu. ft. of space. Place liquid in saucers or shallow vessels near top of room if : avoid lights. For underground insects, a tablespoonful placed in holes a few feet apart. CHAPTER XL DISEASES OF TREES AND VINES A few suggestions concerning pathological conditions whicharise in trees and vines and prescription of treatment and remediesmay be helpful: First, diseases demonstrated to be caused by fungiand bacteria; second, abnormal conditions, of which the causes arenot yet Effect of mildew on young growth of grape vine. Powdery Mildews.—Fungi which bring upon the leaf surface theappearance of a whitish powder and afterwards cause the leaf tocurl and dry without producing marked swelling, perforation or dis-coloration, can be checked by the use of sulphur. The chief of theseis the mildew of the grape, the mildew of the apple, appearing chieflyon the young growth, etc. The way to use sulphur for these fungiis to throw finely ground or sublimed sulphur on the young foliage 578 LEAF SPOT FUNGI 579 at the first sign of the trouble, either by hand or with suitablemachinery which is fully discussed in Bulletin 186 of the CaliforniaExperiment Station. Leaf-Spotting, Puncturing or Deforming Fungi.—These classesare usually distinguishable by the results they produce. The mil-dew of the peach produces dense, whitish patches on the leaves andgrowing fruit; the curl-leaf fungus of the peach produces swellingsand cont
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