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1 October 2011 Germination and Emergence Characteristics of Spreading Dogbane (Apocynum androsaemifolium)
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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), (1 October 2011).
Received: 24 February 2011; Accepted: 1 June 2011; Published: 1 October 2011

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