Chemical residues and bioactivity of tebufenozide applied to apple foliage
| Autor: | Michael J. Smirle, Cheryl L. Zurowski, D. Thomas Lowery |
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| Rok vydání: | 2004 |
| Předmět: |
Tortricidae
Insecticides Rosaceae Choristoneura rosaceana Insect Control chemistry.chemical_compound Insect growth regulator Botany Animals Bioassay Chromatography High Pressure Liquid Tebufenozide biology Chemistry Pesticide Residues General Medicine Pesticide biology.organism_classification Lepidoptera Plant Leaves Kinetics Horticulture Hydrazines Malus Insect Science Biological Assay Agronomy and Crop Science Fruit tree Half-Life |
| Zdroj: | Pest Management Science. 60:1137-1142 |
| ISSN: | 1526-4998 1526-498X |
| DOI: | 10.1002/ps.929 |
| Popis: | Tebufenozide, an insect growth regulator that acts as an ecdysone agonist, was applied at recommended label rate to apple trees in August 1997 and May 1998. Foliar residues were determined by high-performance liquid chromatography from samples collected 2, 24, 48 and 96 h post-spray, and at weekly intervals thereafter for 9 weeks in 1997 and 11 weeks in 1998. Foliage sampled at the same times was used in bioassays to determine residual toxicity to first-instar obliquebanded leafrollers, Choristoneura rosaceana (Harris). Residue decay followed first-order kinetics in both years, with residual half-life of 36.3 days in 1997 and 7.2 days in 1998. Estimates of the time needed to reduce bioactivity to 50% in bioassays were 18.7 days in 1997 and 36.3 days in 1998. The accuracy of equations describing decay of tebufenozide residues and bioactivity over time was not improved by using degree-day accumulations as the independent variable. |
| Databáze: | OpenAIRE |
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