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Temperature and Photoperiod Effects on Onionweed (Asphodelus fistulosus) and Its Potential Range in the United States

Published online by Cambridge University Press:  12 June 2017

David T. Patterson
David T. Patterson*
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Univ. Florida-IRREC, 2199 S. Rock Rd., Ft. Pierce, FL 34945-3138
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Abstract

Environmental factors that affect the growth and development of onionweed were evaluated in order to predict its potential range and impact in the U.S. In controlled-environment experiments, onionweed achieved 60 to 100% of its maximum vegetative growth at temperatures ranging from 18/11 to 30/23 C day/night. The greatest biomass was produced at day temperatures of 18 or 24 C and night temperatures of 11 or 17 C. Leaf production and reproductive development were greatest at 18/11 C. Plants eventually flowered also at 18/17, 24/17, and 24/11 C but not in any regime with a 30 C-day or a 23 C-night. Flowering occurred earlier in 16-h photoperiods than in 16-h photoperiods than in 8-h photoperiods. Climatic analyses revealed no U.S. analogs of the principal Australian onionweed sites. Based on its environmental responses and its pattern of distribution as a weed in Australia, onionweed will likely remain confined to the southwestern U.S.

Keywords

Onionweed, Asphodelus fistulosus L. # ASHFIExotic weednoxious weedecological range
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 684 - 688
Copyright
Copyright © 1996 by the Weed Science Society of America 

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