. Annual report of the North Carolina Agricultural Experiment Station . tly de-velop, others have their filaments dwarfed, and still others developnormal filaments but with anther sacks that are diseased and whichliberate only defective or aborted pollen. The remaining stamens ap-parently produce normal pollen, but fruit will not set when the flowersare self-pollinated. 18 JN\ C. Agricultural Experiment Station The flower of Rathbun is very similar to that of Premo except thatthe pistils do not protrude from the flower bud. When Rathbun flowersare self-pollinated we usually get some fruit deve
. Annual report of the North Carolina Agricultural Experiment Station . tly de-velop, others have their filaments dwarfed, and still others developnormal filaments but with anther sacks that are diseased and whichliberate only defective or aborted pollen. The remaining stamens ap-parently produce normal pollen, but fruit will not set when the flowersare self-pollinated. 18 JN\ C. Agricultural Experiment Station The flower of Rathbun is very similar to that of Premo except thatthe pistils do not protrude from the flower bud. When Rathbun flowersare self-pollinated we usually get some fruit development, and this fruitmay range all the way from almost perfect to no fruit at all. In regard to the question of self-sterility of varieties of dewberries,however, the fact still remains that in many other varieties with healthynormal stamens, complete self-sterility exists. Hence, another solutionof the question of sterility must be sought. Petalody in normal plants must not be confused in any way withDouble Blossom (34th Ann. Kept. 1ST. C. Agr. Exp. Sta., 1912, by. (blackberry-dewberry hybrid), showing very muchimens. Reimer and Detjen and De; Agr. Exp. Sta. Bui. No. 93, by M. T. Cook),which is a disease that is caused by a parasitic fungus, Fusarium rubi(Winter). This fungus is frequently the cause of the development of unusuallylarge numbers of petals in the flowers of some varieties, notably, Lucretiaand Wilson. In fact, some of the affected blooms quite resemble asmall white double rose. The real difference between a petaliferous bloom of a normal plantand a petaliferous bloom of one that is affected with Fusarium rubiis revealed in the production of fruit. Petaliferous flowers on otherwise Self-sterility in Dewberries and Blackberries 19 normal plants, when cross-pollinated with self-fertile varieties, veryfrequently set normal berries, while those petaliferous blooms whichare the direct result of the action of fusarium very seldom if ever setfruit. The reason for this
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