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Acrolein Reduces Biomass and Seed Production of Potamogeton pectinatus in Irrigation Channels

Published online by Cambridge University Press:  20 January 2017

Diego J. Bentivegna*
Affiliation:
Comisión de Investigaciones Científicas de la Pcia, Buenos Aires (CIC) and Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS), Casilla de Correo 738, Universidad Nacional del Sur (UNS), 8000 Bahía Blanca, Argentina
Osvaldo A. Fernández
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and CERZOS, Casilla de Correo 738, Universidad Nacional del Sur (UNS), 8000 Bahía Blanca, Argentina
María A. Burgos
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and CERZOS, Casilla de Correo 738, Universidad Nacional del Sur (UNS), 8000 Bahía Blanca, Argentina
*
Corresponding author's E-mail: dbentive@criba.edu.ar

Abstract

Chemical weed control with acrolein has been shown to be a lower cost method for reducing submerged plant biomass of sago pondweed in the irrigation district of the Lower Valley of Rio Colorado, Argentina (39°10′S–62°05′W). However, no experimental data exist on the effects of the herbicide on plant growth and its survival structures. Field experiments were conducted during 3 yr to evaluate the effect of acrolein on growth and biomass of sago pondweed and on the source of underground propagules (i.e., rhizomes, tubers, and seeds). Plant biomass samples were collected in irrigation channels before and after several herbicide treatments. The underground propagule bank was evaluated at the end of the third year. Within each treatment, plant biomass was significantly reduced by 40 to 60% in all three study years. Rapid new plant growth occurred after each application; however, it was less vigorous after repeated treatments. At the end of the third year at 3,000 m downstream from the application point, plant biomass at both channels ranged from 34 to 3% of control values. Individual plant weight and height were affected by acrolein treatments, flowering was poor, and seeds did not reach maturity. After 3 yr, acrolein did not reduce the number of tubers. However, they were significantly smaller and lighter. Rhizomes fresh weight decreased by 92%, and seed numbers decreased by 79%. After 3 yr of applications, operational functioning of the channels could be maintained with fewer treatments and lower concentrations of acrolein.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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References

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