In an experiment designed to determine the effectiveness of a 400-foot-wide isolation zone for a five-acre seed orchard, all male flowers within the orchard were removed prior to pollination. Female cones borne the same year developed normally and produced normal yields of germinable seed. Isolation, therefore, was not effective under these conditions. Studies designed to determine how much contamination occurs under normal conditions, with a good pollen crop on seed orchard trees, are urgently needed.
Document Type: Journal Article
Principal Plant Geneticist, Southeastern Forest Expt. Sta., Forest Service, U.S. Dept. Agric. Olustee, Fla.
Publication date: November 1, 1967
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