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Germination and Emergence Characteristics of Spreading Dogbane (Apocynum androsaemifolium)

Published online by Cambridge University Press:  20 January 2017

N. S. Boyd  and
A. Hughes
N. S. Boyd*
Affiliation:
Department of Environmental Sciences, Nova Scotia Agricultural College, Truro, NS, Canada B2N 5E3
A. Hughes
Affiliation:
Department of Environmental Sciences, Nova Scotia Agricultural College, Truro, NS, Canada B2N 5E3
*
Corresponding author's E-mail: [email protected]
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Abstract

Spreading dogbane is an important weed of wild blueberry fields that decreases yields and hinders harvest operations. A range of experiments was conducted to evaluate the impact of abiotic factors on dogbane seed germination. Freshly harvested seeds were largely nondormant with viability ranging between 67 and 84%. Prolonged exposure to light neither promoted nor inhibited germination. Germination rates and total seed germination varied with temperature and osmotic potential. Significantly fewer seeds germinated at 5 C compared with 10, 15, and 20 C. There was a significant quadratic relationship between dogbane germination and osmotic potential, with significant numbers of seeds germinating at levels as low as −0.5 MPa. Emergence rates declined exponentially with depth in the soil and as many as 9% of seeds germinated but were unable to reach the soil surface. Results indicate that substantial seed germination in blueberry fields is possible and primary dispersal without wind occurs over a very short distance.

Keywords

Spreading dogbane, Apocynum androsaemifolium Lwild blueberry, Vaccinium angustifolium AitOsmotic potentialseedpHtemperatureseedbank
Type
Weed Biology and Ecology
Information
Weed Science , Volume 59 , Issue 4 , December 2011 , pp. 533 - 537
Copyright
Copyright © Weed Science Society of America 

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References

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