. Fig. 17.—Washingtonia filifera palm trees killed by bud rot. doomed and should be promptly removed. Replacements may be made with W. robusta. Trunk cankers may sometimes be given surgical treat- ment and the palms saved. Diamond Scale.—Diamond scale is so called from the elongated, dia- mond-shaped, black, shiny pustules, % to % inch long (fig. 18) that erupt through the epidermis of leaves and leafstalks. It is caused by the fungus Sphaerodothis neowashingtoniae.

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Keywords: ., bo, bookcentury1900, booksubjectflowers, booksubjectplantdiseases