. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. Plum Pockets or Bladder Plums. The fruit on the left Is healthy, that on the right is diseased. (Original.) occurring on the common or European plums (Pruniis domestica). It is most pre- valent in cold, wet springs. It cannot, however, be regarded as a disease of any groat economic importance. Si/mpfoms. Soon after the fruit is .^ct it bcponics swollen, hollow, without a pit or stone, and often distorted in sliap
. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. Plum Pockets or Bladder Plums. The fruit on the left Is healthy, that on the right is diseased. (Original.) occurring on the common or European plums (Pruniis domestica). It is most pre- valent in cold, wet springs. It cannot, however, be regarded as a disease of any groat economic importance. Si/mpfoms. Soon after the fruit is .^ct it bcponics swollen, hollow, without a pit or stone, and often distorted in sliape. These light, hollow, bladder-like fruits have suggested the common name " Bladder ; In the early stages, affected fruits are yellowish or reddish in colour. Later they become covered with a whitish bloom. This is due to the production of numerous spore sacs (asci) on the surface. These sacs (asei) contain ascospores. After these are di.«charge<l the fruit turns dark brown in colour and falls off. Life History. The fungus which causes Plum Pockets appears to live over winter as spores, adhering on or between the bud scales. These germinate and produce infection of the young ovaries when the buds are bursting in the spring. Prevention. Spraying as recommended for Peacli Leaf-Curl appears to prevent this disease Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Howitt, J. E. (John Eaton), 1880-1966; Caesar, Lawson, 1870-1952; Ontario. Dept. of Agriculture. Toronto : Dept. of Agriculture
Size: 1319px × 1895px
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License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsprayinganddustingin
