Experimentally applying pesticides is an important method to assess the e cacy of weed biocontrol agents, but potential direct e ects of the chemicals on plant performance are controversial or unknown. We assessed how three broad-spectrum insecti- cides applied in combination a ect the performance of the widely invasive, crop-yield reducing, allergenic common ragweed (Ambrosia artemisiifolia L.) in an insect-free environment. Spraying insecticides had no signi cant e ects on aboveground dry weight, seed and pollen output or pollen allergenicity, and only explained 1–8% of variation in these parameters. Our insecticide treatment can hence be applied to assess biocontrol impact on biomass and reproductive output of common ragweed. As our in- secticide treatment delayed senescence, however, other methods of insect exclusion should be preferred when studying common ragweed phenology

Direct effects of insecticides on common ragweed-implications for natural enemy exclusion trials

Fogliatto Silvia;Vidotto Francesco;
2018-01-01

Abstract

Experimentally applying pesticides is an important method to assess the e cacy of weed biocontrol agents, but potential direct e ects of the chemicals on plant performance are controversial or unknown. We assessed how three broad-spectrum insecti- cides applied in combination a ect the performance of the widely invasive, crop-yield reducing, allergenic common ragweed (Ambrosia artemisiifolia L.) in an insect-free environment. Spraying insecticides had no signi cant e ects on aboveground dry weight, seed and pollen output or pollen allergenicity, and only explained 1–8% of variation in these parameters. Our insecticide treatment can hence be applied to assess biocontrol impact on biomass and reproductive output of common ragweed. As our in- secticide treatment delayed senescence, however, other methods of insect exclusion should be preferred when studying common ragweed phenology
2018
43
1
36
40
https://www.jstage.jst.go.jp/article/jpestics/advpub/0/advpub_D17-048/_article
biological weed control, growth promotor, insect exclusion, invasive plant, plant performance, phytotoxicity
Lommen, Suzanne; Fogliatto, Silvia; Vidotto, Francesco; Citterio, Sandra; Augustinus, Benno; Müller-Schärer, Heinz
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1658882
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