. Bush-fruits. Berries; Fruit-culture. 256 Bush-Fruits SPUR-BLIGHT OP RED RASPBERRIES (FlG. 36) Mycosphcerella rubina, Jacz. This disease appears in the form of brown or bluish-black spots on the young canes of red raspberries, in late summer or early au- tumn. The spots may be from one to four inches long and may extend partially or wholly around the cane. The bound- aries are sharply defined but only the bark is affected, the cane itself being uninjured. The disease is common on red raspberries and is also found on Purple-Cane varie- ties, but not on black-caps. During winter the spots chang
. Bush-fruits. Berries; Fruit-culture. 256 Bush-Fruits SPUR-BLIGHT OP RED RASPBERRIES (FlG. 36) Mycosphcerella rubina, Jacz. This disease appears in the form of brown or bluish-black spots on the young canes of red raspberries, in late summer or early au- tumn. The spots may be from one to four inches long and may extend partially or wholly around the cane. The bound- aries are sharply defined but only the bark is affected, the cane itself being uninjured. The disease is common on red raspberries and is also found on Purple-Cane varie- ties, but not on black-caps. During winter the spots change to a light gray color and the boundaries become indistinct. In spring they are thickly studded with small black spore-cases, known as perithecia, but the wood is still uncolored and the cane ap- parently uninjured in growth. In this respect it differs decidedly from the cane- blight. Recent investigations at the Colorado Station show that the disease may do con- siderable damage by killing the buds and thereby preventing the formation of branches on the lower portion of the cane. Hence the name spur-blight. It appears highly probable that the disease may be controlled by the use of bordeaux mixture, the first application being made when the new canes are a few inches high, a second one shortly before the blooming period and a third soon after the fruit is harvested; but it is doubtful if the damage done is suffi- cient to warrant the expense of spraying. This trouble was formerly thought to be due to a bacterial disease and was figured as such in a previous edition of the present Fig 36. Spur-blight 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 Card, Fred Wallace, 1863-. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfruitculture, bookyea
