Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 118 California Agricultural Extension Service [Cir. 120 64). Cracking and gumming also occur. This is caused by pear thrips, Taeniothrips inconsequent, a smaU insect which works on the blossom and the very young fruit. See Extension Circular 87. Tragedy Canker, Pustular Canker.—The trouble has been seen only on trees of the Tragedy variety of prune. On twigs and smaller branches, Fig. 65.—Pustular canker of Tragedy prune. small, diamond-shaped or elongated pustules break out in the bark (fig. 65) of
Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 118 California Agricultural Extension Service [Cir. 120 64). Cracking and gumming also occur. This is caused by pear thrips, Taeniothrips inconsequent, a smaU insect which works on the blossom and the very young fruit. See Extension Circular 87. Tragedy Canker, Pustular Canker.—The trouble has been seen only on trees of the Tragedy variety of prune. On twigs and smaller branches, Fig. 65.—Pustular canker of Tragedy prune. small, diamond-shaped or elongated pustules break out in the bark (fig. 65) of affected trees. The growth is stunted and partially killed. The cause and method of control are unknown; possibly it is a virus disease. POMEGRANATE gmut. The inside of a mature, infected fruit contains a mass of black, dusty, mold spores. This disease is not a true smut but is like the so-called 'smut' of figs (p. 73) and is caused by a similar but not the same fungus, another species of Aspergillus. There is no apparent way of preventing this condition. PRUNE See 'Tluni, Prune' (p. 109)
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