Investigating the use of aquatic weeds as biopesticides towards promoting sustainable agriculture

Fu Yuting, Bhadha Jehangir H., Rott Philippe, Beuzelin Julien M., Kanissery Ramdas. 2020. Investigating the use of aquatic weeds as biopesticides towards promoting sustainable agriculture. PloS One, 15 (8):e0237258, 23 p.

Journal article ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total
Published version - Anglais
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Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Abstract : Aquatic weeds such as muskgrass (Chara spp.), water hyacinth (Eichhornia crassipes), water lettuce (Pistia stratiotes), hydrilla (Hydrilla verticillate), filamentous algae (Lyngbya wollei), and duckweed (Lemna minor) thrive in farm canals within the Everglades Agricultural Area of South Florida. Their presence, particularly during the summer months is an environmental concern with regards to water quality, in addition to being a nuisance because of their ability to multiply and spread rapidly in open waters causing restricted drainage/irrigation flow and low dissolved oxygen levels. Chemical control is effective but can have undesirable off-target effects, so reduced herbicide use is desirable. Hence, need exists to discover ways in which these weeds could be best managed or utilized. The objective of this research was to evaluate the allelopathic effect of these weeds to determine their use as potential biopesticides. Six aqueous extracts were tested against 100 bacterial strains isolated from plants and soil to evaluate their antimicrobial activity. These extracts were also used to determine their insecticidal and antifeedant effects on fall armyworm (FAW, Spodoptera frugiperda). Both extracts and powder form of the aquatic weeds were tested for their herbicidal activity towards seed germination and growth of three common terrestrial weed species. At a dilution of 1:100 and 1:1,000, none of the aquatic weeds inhibited in-vitro growth of the bacterial strains, with one exception (filamentous algae extract at 1:100 reduced growth of one bacterial isolate by 54%). Water lettuce reduced the survival rate of FAW by 14% while hydrilla and duckweed caused 11% and 9% reduction of FAW growth, respectively. Powdered duckweed inhibited the growth of nutsedge by 41%, whereas filamentous algae powder and extract reduced germination of amaranth by 20% and 28%, respectively. Harvesting these weeds and converting them into useable compounds could not only eliminate the in situ farm canal and water quality problems but also result in development of new soil amendments or biopesticides.

Mots-clés Agrovoc : Mauvaise herbe aquatique, Agriculture durable, Biopesticide, Eichhornia crassipes, Pistia stratiotes, Hydrilla verticillata, Algae

Mots-clés géographiques Agrovoc : Floride

Mots-clés complémentaires : chara, lyngbya wollei, lemna minor

Mots-clés libres : Weeds, Larvae, Algae, Ethanol, Root growth, Seed germination, Lettuce, Leaves

Classification Agris : H60 - Weeds and weed control
H01 - Protection of plants - General aspects

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

  • Fu Yuting, University de Florida (USA)
  • Bhadha Jehangir H., University de Florida (USA) - auteur correspondant
  • Rott Philippe, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0001-6085-6159
  • Beuzelin Julien M., University of Florida (USA)
  • Kanissery Ramdas, University de Florida (USA)

Source : Cirad-Agritrop (

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