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Home → Publications → Tree Planters' Notes → Tree Planters' Notes Issue 72 (1965) → Use of X-Ray Technique for Determining Sound Seed

Use of X-Ray Technique for Determining Sound Seed

The California Division of Forestry became involved with the use of radiographs for seed evaluation through a cooperative study with Dr. R. W. Stark, Associate Professor of Entomology, Department of Entomology and Parasitology, University of California at Berkeley. Dr. Stark's work (2) was on "bad seed" detection methods based on the use of X-rays in seed examination that had been developed by Simak (1) and others. The studies of the Division of Forestry have been only exploratory. Evaluations of individual seeds on radiographic prints have been compared with actual germination of the same seed. Work has been done on ponderosa pine (Pinus ponderosa), Douglas-fir (P s e u dots u g a m e n z i e s i i), white fir (Abies concolor), Monterey pine (Pinus radiata), and Sierra redwood (Sequoia gigantea). White fir seed is quite troublesome because of pitch pockets. Sierra, redwood seed is extremely difficult to work with because of its small size.


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Author(s): C. J. Eden

Publication: Tree Planters' Notes - Issue 72 (1965)