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Survival and dormancy of purple nutsedge (Cyperus rotundus) tubers

Published online by Cambridge University Press:  12 June 2017

Christophe Neeser ,
Renan Aguero  and
Clarence J. Swanton
Christophe Neeser
Affiliation:
Crop Science, University of Guelph, Guelph, ON, Canada N1G 2W1
Renan Aguero
Affiliation:
Plant Sciences, University of Costa Rica, San Jose, Costa Rica
Clarence J. Swanton
Affiliation:
Crop Science, University of Guelph, Guelph, ON, Canada N1G 2W1
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Abstract

Survival and dormancy of purple nutsedge tubers has not been studied quantitatively. Yet this is fundamental to our understanding of the population dynamics of this highly noxious weed. Field studies were conducted to determine the effect of age on tuber survival and dormancy. A modified exponential decay function accurately described the age-dependent decline in tuber survival. This model is biologically meaningful, has good statistical properties, and can describe a wide range of responses. Tuber population half-life was 16 mo, and the predicted longevity (99% mortality) was 42 mo. Burial depth at 8 and 23 cm had no significant effect on survival or dormancy. Tuber dormancy increased with age. After 18 mo, the proportion of dormant tubers in the surviving population was two-and-one-half times higher than in the 3-mo-old population. We report for the first time that tubers were able to enter a state of secondary dormancy after sprouting. The finding that tubers persist after sprouting has important implications for population dynamics of this species. This is also the first report of tuber predation by the larvae of a billbug.

Keywords

Purple nutsedge, Cyperus rotundus L.billbug, Sphenophorus incurrens GyllenhalPopulation dynamicsmortalitytubersecondary dormancyCYPRO
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 6 , December 1997 , pp. 784 - 790
Copyright
Copyright © 1997 by the Weed Science Society of America 

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