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Freezing Resistance of Overwintering Buds of Four Perennial Weeds

Published online by Cambridge University Press:  12 June 2017

Wanda K. Schimming  and
Calvin G. Messersmith
Wanda K. Schimming
Affiliation:
Agron. Dep., North Dakota State Univ., Fargo, ND 58105
Calvin G. Messersmith
Affiliation:
Agron. Dep., North Dakota State Univ., Fargo, ND 58105
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Abstract

The freezing resistance of overwintering buds of four perennial weed species was evaluated in artificial freezing experiments conducted in the winters of 1986 and 1987. Survival, dry weight of surviving shoots, and number of shoots produced/surviving section were determined at −4, −8, −12, −16, and −20 C for Canada thistle roots, leafy spurge roots, leafy spurge crowns, perennial sowthistle roots, and quackgrass rhizomes. The temperature required to reduce survival (LT50) and total dry weight (GR50) by 50% was determined. The response to freezing temperatures varied among species and in some cases between years. The LT50 was −7, −13, colder than −20, −17, and colder than −20, and the GR50 was −5, −11, −14, −15, and −13 for Canada thistle roots, leafy spurge roots, leafy spurge crowns, perennial sowthistle roots, and quackgrass rhizomes, respectively. The relative susceptibility to freezing among species appears to be directly related to the depth at which the overwintering buds generally are located.

Keywords

Canada thistle, Cirsium arvense (L.) Scop. #3 CIRARleafy spurge, Euphorbia esula L. # EPHESperennial sowthistle, Sonchus arvensis L. # SONARquackgrass, Agropyron repens (L.) Beauv. #AGRRECold temperatureAgropyron repensCirsium arvenseEuphorbia esulaSonchus arvensisAGRRECIRAREPHESSONAR
Type
Weed Biology and Ecology
Information
Weed Science , Volume 36 , Issue 5 , September 1988 , pp. 568 - 573
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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