Excretion of non-metabolized insecticides in honeydew of striped pine scale
| Autor: | Carlos R. Quesada, Michael E. Scharf, Clifford S. Sadof |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Honeydew
Insecticides Environmental Engineering Insecta Health Toxicology and Mutagenesis 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences 01 natural sciences Predation Hemiptera chemistry.chemical_compound Neonicotinoids Soil Imidacloprid parasitic diseases Environmental Chemistry Animals Spiro Compounds Coccidae 0105 earth and related environmental sciences Scale insect Aza Compounds biology Public Health Environmental and Occupational Health Imidazoles food and beverages General Medicine General Chemistry biology.organism_classification Nitro Compounds Pinus Pollution 020801 environmental engineering Horticulture chemistry Bioaccumulation Toxicant |
| Zdroj: | Chemosphere. 249 |
| ISSN: | 1879-1298 |
| Popis: | Honeydew production is a characteristic of soft scales and other hemipteran insects. Honeydew has the capacity to alter the ecology of predators and parasitoids because it is used as a food resource and can contain insecticidal proteins from hemipteran host plants. We examined honeydew excreted by the striped pine scale (Hemiptera: Coccidae), Toumeyella pini (King), after feeding on pine trees treated with systemic insecticides to determine whether they could eliminate insecticidal compounds in honeydew. Imidacloprid and spirotetramat were applied at labeled rates to soil or foliage. Water sensitive paper was used to measure honeydew production and liquid chromatography coupled to mass spectrometry (LC-MS) to analyze excreted insecticide concentrations. Foliar and soil applications of imidacloprid caused a 25-fold reduction honeydew produced by scales six days after treatment (DAT). In contrast, spirotetramat treatments did not affect honeydew production. Parent compounds of both insecticides were detected in honeydew. However, on imidacloprid treated plants, these compounds were detected at similar concentrations in honeydew collected at 4 DAT from soil and foliar treatments. Imidacloprid was only detected from soil treatments at 8 DAT. Similarly, the spirotetramat parent compound was found 4 DAT after soil and foliar treatments, but only at 8 DAT in foliar treatments. At this time the concentration of spirotetramat in honeydew was six-fold higher than at 4 DAT. We conclude that striped pine scales excrete insecticides in honeydew even when the toxicant greatly reduces honeydew production. Honeydew excretion is thus a mechanism of bioaccumulation and has the potential to harm honeydew-feeding organisms. |
| Databáze: | OpenAIRE |
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