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Toxicity of herbicides and surfactants to three insect biological control agents for Cytisus scoparius (Scotch broom).
| Content Provider | Semantic Scholar |
|---|---|
| Author | Affeld, Kathrin Hill, Kate Smith, Lindsay A. Syrett, Pauline Cullen, John M. Briese, David Kriticos, Darren J. Lonsdale, Wade Morin, Louise Scott, John K. |
| Copyright Year | 2004 |
| Abstract | Integrated weed management is disrupted if chemicals applied to suppress weeds harm insect biological control agents. Three herbicides and two surfactants for control of Cytisus scoparius (Scotch broom) were topically applied to Arytainilla spartiophila (broom psyllid), Bruchidius villosus (broom seed beetle), and Leucoptera spartifoliella (broom twig miner) at a range of concentrations. Arytainilla spartiophila was the most susceptible to all substances tested. Glyphosate was less toxic to A. spartiophila than triclopyr and picloram + triclopyr, but at a concentration equivalent to recommended field rate, caused significant mortality. Leucoptera spartifoliella adults were significantly more tolerant of herbicides, except triclopyr, than of the two surfactants. Combined with the surfactant polydimethylsiloxane, glyphosate caused significantly increased mortality to A. spartiophila and L. spartifoliella. All substances caused mortality in the test insects at concentrations below recommended field rates, except triclopyr applied to B. villosus, and surfactants were generally more toxic at lower concentrations. However, there was no significant difference between adult emergence from L. spartifoliella pupae topically sprayed with herbicides or glyphosate + surfactant and the controls. We conclude that surfactants harm all three insects, A. spartiophila is susceptible to all forms of chemical control, but L. spartifoliella and B. villosus are likely to tolerate glyphosate applied at field rate, without surfactant. |
| Starting Page | 375 |
| Ending Page | 380 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://bugwoodcloud.org/ibiocontrol/proceedings/pdf/11_375-380.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
