1 January 2001 Effects of drawdowns and dessication on tubers of hydrilla, an exotic aquatic weed
Robert D. Doyle, R. Michael Smart
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Subterranean turions (tubers) of hydrilla lose viability when desiccated. Experimental data showed that freshly collected tubers had a moisture content between 50 and 60% and more than 90% viability. When desiccated, there was an approximate 2% increase in tuber mortality with each percent decline in moisture content. However under field conditions, the tuber bank within the exposed sediments of a northern Texas reservoir showed no decline in number or tuber viability throughout a 12-mo continuous drawdown. Apparently, the buried tubers were never subject to sufficient dessication to damage them. Finally, an experimental pond with an extensive hydrilla tuber bank was manipulated through six flood/drawdown cycles to determine the effects of short-term drawdowns on tuber survival and quiescence. Initially, the pond had a tuber bank of about 676 and 305 tubers m−2 in the shallow and deep zones, respectively. Although the tuber number was reduced to fewer than 15 to 30 tubers m−2 by these repetitive drawdowns, hydrilla tubers were not eradicated from the pond.

Nomenclature: Hydrilla, Hydrilla verticillata (L.F.) Royle HYLLI.

Robert D. Doyle and R. Michael Smart "Effects of drawdowns and dessication on tubers of hydrilla, an exotic aquatic weed," Weed Science 49(1), 135-140, (1 January 2001). https://doi.org/10.1614/0043-1745(2001)049[0135:EODADO]2.0.CO;2
Received: 22 June 2000; Accepted: 28 August 2000; Published: 1 January 2001
aquatic weeds
physical control
submersed plants
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