. Diseases of economic plants. Plant diseases. 92 Diseases of Economic Plants be set in the places from which diseased trees have been removed. Recognition marks, which leave no uncertainty as to its identity, are described by Smith as follows: "Prematurely ripe, red-spotted fruits, and premature unfolding of the leaf buds into slender, pale shoots, or into branched, broom- like growths, are the most characteristic symptoms of yellows. The time of ripen- ing of premature fruit varies within wide limits; sometimes it precedes the nor- mal ripening by only a few days, and at other times liy
. Diseases of economic plants. Plant diseases. 92 Diseases of Economic Plants be set in the places from which diseased trees have been removed. Recognition marks, which leave no uncertainty as to its identity, are described by Smith as follows: "Prematurely ripe, red-spotted fruits, and premature unfolding of the leaf buds into slender, pale shoots, or into branched, broom- like growths, are the most characteristic symptoms of yellows. The time of ripen- ing of premature fruit varies within wide limits; sometimes it precedes the nor- mal ripening by only a few days, and at other times liy several weeks. The red spots occur in the flesh as well as on the skin, making the peach more highly col- ored than is natural. The taste of the Fig 47. — Mildew ^^""^^ ^^ generally inferior and often in- upon peach fruit, sipi^l, mawkish, or bitter. Often this After Bailey. premature ripening is the first sjanptom of yellows. The peaches are then of good size and quite showy, and occur on trees in full vigor, upon limbs bearing abundant green foliage, and sometimes also other fruits which afterward ripen normally. "Often during the first year of the disease this kind of fruit is restricted to certain limbs, or even to single twigs, which, however, do not differ in appearance from other limbs of the tree. The following year a larger part of the tree becomes affected and finally the whole of it, the parts first attacked now showing additional symptoms, if they have not already done so. These symptoms are the development of the winter buds out of their proper season. Like the prematur- ing of the fruit, the date of this also varies within wide limits. The buds may push into shoots only a few days in advance of the proper time in the spring, or may begin to grow in early summer, soon after they are formed, and while the leaves on the parent stem are still bright green. This is a very common and characteristic symptom, and is especially noticeable in autumn when t
Size: 1416px × 1766px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1920, bookyear1921
