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Control of Waterhyacinth (Eichhornia crassipes) with Neochetina eichhorniae (Coleoptera: Curculionidae) and a Growth Retardant

Published online by Cambridge University Press:  12 June 2017

Ted D. Center ,
Kerry K. Steward  and
Marc C. Bruner
Ted D. Center
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Aquat. Plant Manage. Lab., 3205 S.W. 70th Av., Fort Lauderdale, FL 33314
Kerry K. Steward
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Aquat. Plant Manage. Lab., 3205 S.W. 70th Av., Fort Lauderdale, FL 33314
Marc C. Bruner
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Aquat. Plant Manage. Lab., 3205 S.W. 70th Av., Fort Lauderdale, FL 33314
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Abstract

Waterhyacinth [Eichhornia crassipes (Mart.) Solms] grown in screen-enclosed, outdoor aquaria were treated with factorial combinations of 0, 0.75, 1.5, or 3 kg/ha of the experimental growth retardant EL-509 [α-(4-chlorophenyl)-α-(1-methylethyl)-5-pyrimidine-methanol] and zero, one, two, or three pairs of waterhyacinth weevils (Neochetina eichhorniae Warner)/plant, with three replicates of each weevil-number by retardant level combination. When plant growth was evaluated over a time course, significant effects of weevils and retardant were observed. After 127 days, however, waterhyacinth was reduced as weevil numbers increased, but the growth retardant was ineffective without weevils. Weevils appeared to be more effective when used in combination with the retardant, and the combined effects were additive.

Keywords

Biological controlintegrated controlaquatic weedsweevilsEL-509
Type
Research Article
Information
Weed Science , Volume 30 , Issue 5 , September 1982 , pp. 453 - 457
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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