Pacific Southwest

Title: Freezing spring temperatures damage knobcone pine conelets

Author: Krugman, Stanley L.

Date: 1966

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

Station ID: RP-PSW-037

Description: 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

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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.