. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. Fig. 3. Bacteriosis on Large Nuts, Stigma or Blossom End Infection. Section of two nuts, tlie one below affected with bacteriosis ; above, normal nut. It is not probable that insects play much part in the dissemination of the disease, although the organism has been isolated from flies which were found around walnut trees affected with blight. A s
. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. Fig. 3. Bacteriosis on Large Nuts, Stigma or Blossom End Infection. Section of two nuts, tlie one below affected with bacteriosis ; above, normal nut. It is not probable that insects play much part in the dissemination of the disease, although the organism has been isolated from flies which were found around walnut trees affected with blight. A species of aphis is often abundant on the leaves (rarely found on the nuts and branches) that probably causes some leaf infection, as well as a sooty deposit on nuts and leaves. Natural Resistance Considerable variation exists between individual varieties as to susceptibility to blight. The walnut groves of the past, and largely of the present, are seedlings. Individual trees often show considerable resistance to blight. This immunity in a large measure is due to a later blooming period. The difference in time of bloom- ing is frequently one to three months be- tween the earliest and the latest French varieties. Such a wide range in time of blooming gives considerable chance for difference in climatic conditions. Some of these late varieties are comparatively free from blight, although no variety is thought to be immune to the disease, and even some of the most resistant and for this and other reasons most desirable kinds will show, during certain seasons and in certain localities, some blighted nuts. The number, however, is so small as to be of little commercial importance. A variety should not be propagated alone for blight resistance, unless the other characteristics of a good nut are present. It is more profitable to grow a productive tree that gives some blighted nuts than a scant producer that never blights. It has become the practice among the best wal- nut growers of Cal
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Keywords: ., bookcentury1900, booksubjectfruitculture, booksubjectgardening
