. Biennial report of the Oregon State Board of Horticulture ... Horticulture; Fruit-culture; Gardening. 128 .SIXTEENTH BIENNIAL REPORT all spores alighting on tlie bark will be killed before tliey get in. It is evident that tlie more tliorough the spraying, the more perfectly the bark is covered, the nearer the grower will get 100 per Cent protection. It is an interesting fact that while the tree is actively growing, the anthrac- nose fungus can not get a start in the bark. As soon, however, as the tree goe'^ into dormancy at the close of the season and active growth ceases, it can no longer r
. Biennial report of the Oregon State Board of Horticulture ... Horticulture; Fruit-culture; Gardening. 128 .SIXTEENTH BIENNIAL REPORT all spores alighting on tlie bark will be killed before tliey get in. It is evident that tlie more tliorough the spraying, the more perfectly the bark is covered, the nearer the grower will get 100 per Cent protection. It is an interesting fact that while the tree is actively growing, the anthrac- nose fungus can not get a start in the bark. As soon, however, as the tree goe'^ into dormancy at the close of the season and active growth ceases, it can no longer resist the invasion of the fungus. That is why it is not necessary to Protect the tree against disease in the Summer, even though spores may be formed at that time. Just as soon as the fall comes, however, and rainy weather with it, conditions are ideal for infections. All through the fall and into the Winter, infections may occur actively and it is against this infection period that 'the trees must be protected. To insure complete protection, a spray ought to be applied before the fall rains begin and then again after harvesting to renew the coating and insure continued protec- tion through the rest of the winter. As stated previously, growers object to the early spray on bearing trees and are apt to content themselves with the less per- fect protection which the later spray affords. As a result, anthracnose is seldom reduced to a minimum, although in ordinary seasons a reasonable degree of control is secured from the late spray. Growers must realize, nevertheless. that preharvest rains in unprotected orchards will mean a certain amount of infection and after a fall season like that of 1920, there should be no surprise if a consider- able amount of infection develops where only an after-harvest spray is given. The Experiment Station is working on the Problem of getting a more satisfac- tory method of early protection than we now have, but none of the half dozen different materi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjec, booksubjectgardening
