. Annual report of the North Carolina Agricultural Experiment Station . CKBERRIES. Varieties Tested.—In order to provide sufficient material in the wayof varieties to carry on this sterility test, the following varieties weresecured and planted under ordinary field conditions: Dewberries Hybrids Blackberries Austin Cox Blowers Chestnut Ruth Dallas Grandee Haupt Early Cluster Limekiln Rathbun Early Harvest Lucretia McDonald Eldorado Manatee Wilson Illinois Munroe Sorsby Kenoyer Rogers Spalding King Elijah, No. 2 Mersereau Premo Minnewaski San Jacinto Snyder White Method of Procedure.—The method
. Annual report of the North Carolina Agricultural Experiment Station . CKBERRIES. Varieties Tested.—In order to provide sufficient material in the wayof varieties to carry on this sterility test, the following varieties weresecured and planted under ordinary field conditions: Dewberries Hybrids Blackberries Austin Cox Blowers Chestnut Ruth Dallas Grandee Haupt Early Cluster Limekiln Rathbun Early Harvest Lucretia McDonald Eldorado Manatee Wilson Illinois Munroe Sorsby Kenoyer Rogers Spalding King Elijah, No. 2 Mersereau Premo Minnewaski San Jacinto Snyder White Method of Procedure.—The method used to test these varieties forself-sterility may be stated as follows: whole flower-clusters, and often-times several of them, were inclosed in bags so as to exclude all foreignpollen. Some of these bags were ordinary half-pound paper sacks,while others were made of cloth. The latter were made of Pacific lawn,which is a light, gauzy, but very fine-meshed fabric, and which success-fully keeps out all foreign pollen. Self-sterility in Dewberries and Blackberries. ;tim^ Fig. 1.—Premo, a self-sterile variety, produces a crop of nubbins when supplied with aninsufficient amount of acceptable pollen. 8 N. C. Agricultural Experiment Station The relative number of flowers inclosed in each bag depends entirelyupon the species to which the respective varieties belong. Generallyspeaking, the flower clusters of Rubus villosus have relatively largenumbers of flower buds, while those of R. trivialis usually possess fromone to three. By covering the flower clusters before any of the buds had openedor immediately after the careful removal of such as had opened, thuspreventing all foreign pollen from gaining access to the flowers within,the potency of the pollen within the imprisoned flowers was tested. Theflower clusters of each variety were covered during the forepart of theirrespective blooming periods, and to insure a length of time sufficient forfertilization to manifest itself the
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