1 October 2011 Germination and Emergence Characteristics of Spreading Dogbane (Apocynum androsaemifolium)
N. S. Boyd, A. Hughes
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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.

Nomenclature: Spreading dogbane, Apocynum androsaemifolium L.; wild blueberry, Vaccinium angustifolium Ait.

Weed Science Society of America
N. S. Boyd and A. Hughes "Germination and Emergence Characteristics of Spreading Dogbane (Apocynum androsaemifolium)," Weed Science 59(4), 533-537, (1 October 2011). https://doi.org/10.1614/WS-D-11-00022.1
Received: 24 February 2011; Accepted: 1 June 2011; Published: 1 October 2011
osmotic potential
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