Skip to Main Content
Pine pollen collections dates - annual and geographic variationAuthor(s): J. W. Duffield
Source: Res. Note 85. Berkeley, CA: U.S. Department of Agriculture, Forest Service, California Forest and Range Experiment Station. 9 p
Publication Series: Research Note (RN)
Station: Pacific Southwest Research Station
PDF: Download Publication (829.3 KB)
DescriptionActivity in pine breeding has increased throughout the temperate forest regions of the world since the Institute of Forest Genetics issued its first summary of pollen collection dates in 1947. Cooperation between pine breeders has increased at the same time. The information most essential for conducting cooperative breeding operations are the dates of pollen collection (which also approximate the dates at which the bagging of flower buds to control pollination should be done) for various species at various localities. This publication, adding four years' data to the note issued in 1947, covers a period of 14 years. In addition, some data are presented on the relation between temperature and development of catkins and on the effect of altitude on time of pollen collection. These new data, although still fragmentary, should assist workers elsewhere to generalize from the data collected at the Institute of Forest Genetics.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
CitationDuffield, J. W. 1953. Pine pollen collections dates - annual and geographic variation. Res. Note 85. Berkeley, CA: U.S. Department of Agriculture, Forest Service, California Forest and Range Experiment Station. 9 p
- Dates and places of pollen collection by the Institute of Forest Genetics
- Pine pollens frozen five years produce seed
- A presettlement fire history in an oak-pine forest near Basin Lake, Algonquin Park, Ontario
XML: View XML