. Biennial report of the Oregon State Board of Horticulture ... Horticulture -- Oregon; Fruit-culture -- Oregon; Gardening -- Oregon. 196 REPORT OF STATE BOARD OF HORTICULTURE,. 73—'d fruit Bletigbelmer apple. WINTER AND SPRING FROST MAY INJURE THE BLOSSOMS. The unfruitlvilness arising- from winter or .spring- frost injury is some- times confused with self-sterility. Various forms of winter injury to fruit buds are shown in Figs. 72-77. At A in Fig. 72 is a fruit bud which has been completely winter-killed and has no growth whatever. B and C are buds which will never be ab
. Biennial report of the Oregon State Board of Horticulture ... Horticulture -- Oregon; Fruit-culture -- Oregon; Gardening -- Oregon. 196 REPORT OF STATE BOARD OF HORTICULTURE,. 73—'d fruit Bletigbelmer apple. WINTER AND SPRING FROST MAY INJURE THE BLOSSOMS. The unfruitlvilness arising- from winter or .spring- frost injury is some- times confused with self-sterility. Various forms of winter injury to fruit buds are shown in Figs. 72-77. At A in Fig. 72 is a fruit bud which has been completely winter-killed and has no growth whatever. B and C are buds which will never be able to open; while D is a very weak blossom which can- not set fruit. The single open flower on this branch is the only one which can possibly set fruit, A winter-injured cluster of Bietigheimer blossoms is seen in Fig. 73, with a section of one bud in Fig. 74 to show the shriveled stamens and pistils. The leaves in this cluster came through all right, but the flowers were injured. The single flower which has expanded is too small and Aveak to develop into fruit. These winter- injured clusters were common on all va- rieties of pears, particularly Angouleme and Manning Elizabeth, and on some va- rieties of apples, in the spring of 18!j9. Two forms of winter or spring frost ii> jury to the pistils are seen in Figs. 75 and 76, with a normal blossom for comparison in Fig. 77. A common form of injury is that in Fig. 75, in which the pistil is blackened and stunted, having made no perceptible growth during the opening of the flower. These jjistils always drop from the tree soon after the petals have fallen. Another and not less common form of injury is that in Fig. 7(), in which the pistil has made a partial growth but has no well-developed ovary. Unless a careful exam- ination is made, blossoms like this would not be consid- ered as winter-injured. Of flfty which were tagged, none gave fruit, although several fruits grew to the size of peas. The killing of the pistils is the mos
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