. L'enciclopedia di pratica orticoltura; un sistema di riferimento di orticoltura commerciale, coprendo la pratica scientifica e fasi di orticoltura, con speciale riferimento alla frutta e verdura;. Il giardinaggio; frutta-cultura; giardinaggio di vegetale. 412 enciclopedia pratica di orticoltura eties di susine sono auto-sterile; Waite (brevetto statunitense n. S. Divisione di Patologia vegetale, Bull- etin 5) mostra i risultati di molti di- zioni effettuate con la pera per mostrare le affinità di alcuni Yarieties per il polline di alcune altre varietà. Alcuni dei più interessanti scoperte fatte da Waite sono, che t

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. 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. 412 ENCYCLOPEDIA OF PRACTICAL HORTICULTURE eties of plums are self-sterile; Waite (U. S. Division of Vegetable Pathology, Bull- etin 5) shows results of many experi- ments carried on with the pear to show the affinity of certain Yarieties for the pollen of certain other varieties. Some of the most interesting discoveries made by Waite are, that the descriptions given by "Warder, Thomas and Downing were true only for the fruits resulting from cross- fertilization; that the fruits from cross- fertilization were much larger and that the flavor was much better in the crossed Yarieties than the fruits resulting from self-fertilization. Everyone has noticed that isolated fruit trees failed to hear fruit though they blossomed full each year. The Wild Goose plum is a very good illustration of this self-sterility in fruit trees, familiar to everyone who has planted this variety in isolated positions. This self-sterility, as it is called, is the inability of the pollen of a plant to fer- tilize its own ovules or those of other plants of the same horticultural variety and is indicated in fruit trees by the con- tinued dropping of the fruiting organs be- fore the fruits have become well formed, although fruits often drop from other causes, as frost, general debility of the tree, etc. No one can say why a variety should refuse its own pollen and accept that of another variety. Accepting Darwin's law that "Perpetual self-fertilization is injuri- ous and results in inferior and less fertile offspring, " we would admit, that, in the countless ages of the selection of the apple, inferior offspring and, perhaps, the entire loss of fertility has been avoided by self-sterility. In the apple, self-fertil- ization has been gua

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• bookcentury1900
• booksubjectfruitculture
• booksubjectgardening