Freezing spring temperatures damage knobcone pine conelets

Stanley L. Krugman

Treesearch

Freezing spring temperatures damage knobcone pine conelets

Informally Refereed

Authors:

Stanley L. Krugman

Year:

1966

Type:

Research Paper

Station:

Pacific Southwest Research Station

Source:

Res. Paper PSW-RP-37. Berkeley, CA: Pacific Southwest Forest & Range Experiment Station, Forest Service, U. S. Department of Agriculture; 5 p

Download (PDF 267 KB)

Download (PDF 267 KB): https://research.fs.usda.gov/download/treesearch/28702.pdf

Abstract

An anatomical study of ovule and conelet development was made on about 200 developing conelets in a plantation in the central Sierra Nevada of California, after an unseasonal April frost. Night temperatures as low as -6° C. were recorded. Conelets in pollination bags were most susceptible to cold damage; emerging conelets were the most badly damaged; conelets at maximum were only slightly damaged. Low temperatures did not affect final seed set of the surviving cones.

Keywords

Knobcone pine, conelets, freezing temperature

Citation

Krugman, Stanley L. 1966. Freezing spring temperatures damage knobcone pine conelets. Res. Paper PSW-RP-37. Berkeley, CA: Pacific Southwest Forest & Range Experiment Station, Forest Service, U. S. Department of Agriculture; 5 p