Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 82 Calibornia Agricultural Extension Service [Cir. 120 Knot, Tuberculosis.'''—Rough, roundish galls or swellings (fig. 35), from very small up to several inches in diameter, frequently develop on twigs, branches, trunks, roots, leaves, or fruit pedicels, mostly at leaf scars or wounds. The causal agent is a bacterial organism, Phytomonas Savastanoi. Some of the worst infections develop on frost cracks. The Fig. 35.—Olive-knot disease. Manzanillo is the most susceptible variety of those commonly grow
Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 82 Calibornia Agricultural Extension Service [Cir. 120 Knot, Tuberculosis.'''—Rough, roundish galls or swellings (fig. 35), from very small up to several inches in diameter, frequently develop on twigs, branches, trunks, roots, leaves, or fruit pedicels, mostly at leaf scars or wounds. The causal agent is a bacterial organism, Phytomonas Savastanoi. Some of the worst infections develop on frost cracks. The Fig. 35.—Olive-knot disease. Manzanillo is the most susceptible variety of those commonly grown in California. The best control is obtained by cutting out the galls very carefully at their first appearance and disinfecting cuts and tools with 1-1,000 cor- rosive sublimate (p. 159) or as in pear-blight treatment (p. 102). In- fected twigs or small branches should be cut off entirely. Larger wood oalls may be cut out with some success, but extensive, rough gall tissue YoT more complete information, see: Wilson, Edward E. The olive knot disease: its inception, development, and control. Hilgardia 9(4) :231-64. 10 figs. 1935. (Ob- tainable free of charge as long as the supply lasts from the California Agricultural Experiment Station.)
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