Details
| Original language | English |
|---|---|
| Pages (from-to) | 265-274 |
| Number of pages | 10 |
| Journal | Agriculture, Ecosystems and Environment |
| Volume | 94 |
| Issue number | 3 |
| Publication status | Published - Mar 2003 |
Abstract
The effects of the insecticide Lannate® 20 L on target and non-target organisms were studied in sprayed and drift areas of kohlrabi (Brassica oleracea). The study comprised eight field plots (each 12.5 m × 6 m), providing four replicates of a water control and the application with Lannate® 20 L at 0.45 kg/ha. Each plot comprised a 4 m wide sprayed area and a 2 m wide "drift" area, left unsprayed. The parasitoid Aphidius colemani (Hymenoptera; Braconidae) and its host aphid Myzus persicae (Hemiptera; Aphididae) served as indicator organisms. The residual toxicity of Lannate® 20 L to A. colemani and M. persicae was quantified in an exposure experiment. Plants were taken from the field at different time intervals following the insecticide treatment to expose test organisms to plant surfaces in the laboratory. Mortality rates of A. colemani were 94% on plants removed on the day of the application from the treated area and 79 and 69% on plants 0.6 and 2 m downwind from the treated area. No toxic effects on parasitoids were observed 4 days after treatment (a.t.). M. persicae were less susceptible to Lannate® 20 L residues compared to A. colemani. M. persicae mortality was 46% on plants collected from the sprayed area on the day of the application and 5 and 8% on plants collected from the drift area. In addition, densities of aphids and aphid mummies in the treated and drift areas of field plots were assessed from 1 day pre-treatment to 14 days post-insecticide application. Spraying significantly decreased aphid densities, but the population built up again. Compared to the control, no effect was detected on aphid population densities in the drift area of field plots. Densities of mummies in the insecticide treated area of plots were lower compared to densities in the control from 1 day post-application. There was no effect on mummy densities in the drift area. Recolonisation of field plots following the insecticide treatment was estimated by the release of A. colemani. Since A. colemani is not indigenous in northern Germany it was possible to determine their dispersal into the crop by mummy collections. Recovery of A. colemani mummies was low.
Keywords
- Aphidius colemani, Insecticide drift, Methomyl, Myzus persicae, Non-target arthropods
ASJC Scopus subject areas
- Environmental Science(all)
- Ecology
- Agricultural and Biological Sciences(all)
- Animal Science and Zoology
- Agricultural and Biological Sciences(all)
- Agronomy and Crop Science
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In: Agriculture, Ecosystems and Environment, Vol. 94, No. 3, 03.2003, p. 265-274.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Impact of insecticide drift on aphids and their parasitoids
T2 - Residual toxicity, persistence and recolonisation
AU - Langhof, Maren
AU - Gathmann, Achim
AU - Poehling, Hans Michael
AU - Meyhöfer, Rainer
N1 - Funding information: We are grateful to Kevin Brown for comments on an earlier version of this paper. This work was financially supported by DuPont.
PY - 2003/3
Y1 - 2003/3
N2 - The effects of the insecticide Lannate® 20 L on target and non-target organisms were studied in sprayed and drift areas of kohlrabi (Brassica oleracea). The study comprised eight field plots (each 12.5 m × 6 m), providing four replicates of a water control and the application with Lannate® 20 L at 0.45 kg/ha. Each plot comprised a 4 m wide sprayed area and a 2 m wide "drift" area, left unsprayed. The parasitoid Aphidius colemani (Hymenoptera; Braconidae) and its host aphid Myzus persicae (Hemiptera; Aphididae) served as indicator organisms. The residual toxicity of Lannate® 20 L to A. colemani and M. persicae was quantified in an exposure experiment. Plants were taken from the field at different time intervals following the insecticide treatment to expose test organisms to plant surfaces in the laboratory. Mortality rates of A. colemani were 94% on plants removed on the day of the application from the treated area and 79 and 69% on plants 0.6 and 2 m downwind from the treated area. No toxic effects on parasitoids were observed 4 days after treatment (a.t.). M. persicae were less susceptible to Lannate® 20 L residues compared to A. colemani. M. persicae mortality was 46% on plants collected from the sprayed area on the day of the application and 5 and 8% on plants collected from the drift area. In addition, densities of aphids and aphid mummies in the treated and drift areas of field plots were assessed from 1 day pre-treatment to 14 days post-insecticide application. Spraying significantly decreased aphid densities, but the population built up again. Compared to the control, no effect was detected on aphid population densities in the drift area of field plots. Densities of mummies in the insecticide treated area of plots were lower compared to densities in the control from 1 day post-application. There was no effect on mummy densities in the drift area. Recolonisation of field plots following the insecticide treatment was estimated by the release of A. colemani. Since A. colemani is not indigenous in northern Germany it was possible to determine their dispersal into the crop by mummy collections. Recovery of A. colemani mummies was low.
AB - The effects of the insecticide Lannate® 20 L on target and non-target organisms were studied in sprayed and drift areas of kohlrabi (Brassica oleracea). The study comprised eight field plots (each 12.5 m × 6 m), providing four replicates of a water control and the application with Lannate® 20 L at 0.45 kg/ha. Each plot comprised a 4 m wide sprayed area and a 2 m wide "drift" area, left unsprayed. The parasitoid Aphidius colemani (Hymenoptera; Braconidae) and its host aphid Myzus persicae (Hemiptera; Aphididae) served as indicator organisms. The residual toxicity of Lannate® 20 L to A. colemani and M. persicae was quantified in an exposure experiment. Plants were taken from the field at different time intervals following the insecticide treatment to expose test organisms to plant surfaces in the laboratory. Mortality rates of A. colemani were 94% on plants removed on the day of the application from the treated area and 79 and 69% on plants 0.6 and 2 m downwind from the treated area. No toxic effects on parasitoids were observed 4 days after treatment (a.t.). M. persicae were less susceptible to Lannate® 20 L residues compared to A. colemani. M. persicae mortality was 46% on plants collected from the sprayed area on the day of the application and 5 and 8% on plants collected from the drift area. In addition, densities of aphids and aphid mummies in the treated and drift areas of field plots were assessed from 1 day pre-treatment to 14 days post-insecticide application. Spraying significantly decreased aphid densities, but the population built up again. Compared to the control, no effect was detected on aphid population densities in the drift area of field plots. Densities of mummies in the insecticide treated area of plots were lower compared to densities in the control from 1 day post-application. There was no effect on mummy densities in the drift area. Recolonisation of field plots following the insecticide treatment was estimated by the release of A. colemani. Since A. colemani is not indigenous in northern Germany it was possible to determine their dispersal into the crop by mummy collections. Recovery of A. colemani mummies was low.
KW - Aphidius colemani
KW - Insecticide drift
KW - Methomyl
KW - Myzus persicae
KW - Non-target arthropods
UR - http://www.scopus.com/inward/record.url?scp=0037364063&partnerID=8YFLogxK
U2 - 10.1016/S0167-8809(02)00040-3
DO - 10.1016/S0167-8809(02)00040-3
M3 - Article
AN - SCOPUS:0037364063
VL - 94
SP - 265
EP - 274
JO - Agriculture, Ecosystems and Environment
JF - Agriculture, Ecosystems and Environment
SN - 0167-8809
IS - 3
ER -