. Biennial report of the Oregon State Board of Horticulture ... Horticulture -- Oregon; Fruit-culture -- Oregon; Gardening -- Oregon. APPENDIX, 199 varieties are jjlanted near, they are often made fruitful. A self-sterile va- riety is one which is unable to set fruit when alone : in order to be produc- tive, it must be planted near some other variety. Two varieties very com- monly self-sterile are Miner and Wild Goose plums. Large blocks of the Kieffer pear and some of the oreat prune orchards on our Pacific Coast have been unprolitable from this cause. Besides these striking examples, there i
. Biennial report of the Oregon State Board of Horticulture ... Horticulture -- Oregon; Fruit-culture -- Oregon; Gardening -- Oregon. APPENDIX, 199 varieties are jjlanted near, they are often made fruitful. A self-sterile va- riety is one which is unable to set fruit when alone : in order to be produc- tive, it must be planted near some other variety. Two varieties very com- monly self-sterile are Miner and Wild Goose plums. Large blocks of the Kieffer pear and some of the oreat prune orchards on our Pacific Coast have been unprolitable from this cause. Besides these striking examples, there is reason for believing that much of the unsatisfactory fruiting of orchards all over the country is due to the isolation or indiscriminate mixing of va- rieties. THE MAIN CAUSE OF SELF-STERILITY. In general, the cause of self-sterility is that the pollen of a variety is un- able to fertilize the pistils of that same variety. That is, if pollen from a Wild Goose blossom falls on a Wild Goose pistil, whether on the same tree or any other Wild Goose tree, no fruit will result, as a rule. The pollen of a self-sterile variety may be, and generally is. iiroduced in abundance, and is well formed. Wild Goose generally bears pollen freely, although it is one of the most self-sterile varieties in cultivation. The Bartlett pear is often self-sterile, yet its pollen is perfect. (Fig. 80. i The pollen of a self-sterile vai'iety also has vitality, for it will fertilize the pistils of other varieties. For example, plant together trees of the two self-sterile varieties, Miner and Wild Goose, and both will often be made fruitful, because the pollen of each, though infertile on itself, is fertile on the other. It is not so —Pollen of Bart- ^^"^"^^'^ i° what way this infertility is usually shown, but iett. Much mag- with Wild Goose, at least, the pollen grain actually germi- nates and the pollen tube passes down to the ovule. Why the two sexes are unable to unite after having got thu
Size: 1790px × 1396px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcollectionbiodiversity, bookcollectionnybotanicalgarden
