. American bee journal. Bee culture; Bees. 1921 AMERICAN BEE JOURNAL 139 Of the cherries, the Royal Ann, Bing, Black Tartarian, Lambert and Black Republican are self-sterilc. Thirteen varieties of almonds experi- mented with at the California Experi- ment Station were ?wholly self-sterile. Peaches have also been demonstrated to be almost entirely dependent on the visits of bees if a good crop is to ensue. Of the smaller fruits, raspberries, blackberries, strawberries, cranber- ries, etc., are all abundantly visited by bees, and the amount of fruit that would set is entirely proportional to the
. American bee journal. Bee culture; Bees. 1921 AMERICAN BEE JOURNAL 139 Of the cherries, the Royal Ann, Bing, Black Tartarian, Lambert and Black Republican are self-sterilc. Thirteen varieties of almonds experi- mented with at the California Experi- ment Station were ?wholly self-sterile. Peaches have also been demonstrated to be almost entirely dependent on the visits of bees if a good crop is to ensue. Of the smaller fruits, raspberries, blackberries, strawberries, cranber- ries, etc., are all abundantly visited by bees, and the amount of fruit that would set is entirely proportional to the number of visits. The question of the distribution of pollen by wind has been settled at the Oregon Experiment Station by fasten- ing slips of vaselined glass in and near apple trees. So few pollen grains were caught on the sticky glass as to prove conclusively that wind is not at all an agency in carrying across apple pollen grains from one flower to an- ather. It has been proved that if blossoms do not receive pollen grains they fail to set. This is the main explanation for the familiar "June ; It requires one pollen grain for each seed, five pollen grains must, there- fore, fall upon and enter each apple flower, while the strawberry or rasp- berry would require many more grains. When a pollen grain falls on the sticky stigma, the female part of the flower, it starts to grow down a tube carrying the sperm cells into the in- nermost parts of the blossom. The union of a sperm cell with an egg cell starts the growth of the seed. Unless all seeds are started, the fruit becomes misshapen in its growth, if it does not drop entirely from the tree. Hence, a complete poUenation with healthy viable pollen is the first requi- site in the setting of a fruit crop. As shown in the preceding page, some varieties of pollen seem to be better adapted than others in insuring a com- plete fertilization. Even in case of self-fertile varieties, pollen from other blossoms, or better
Size: 1834px × 1362px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1860, booksubjectbees, bookyear1861
