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(176) Variability of growth habits of plant species in the terrestrial (Non-Target) plant test. Reuter, Stephan1, Kubiak, Roland1, 1 ABSTRACT- The terrestrial plant test according to the OECD Guideline 208 (draft document July 2000) represents a bioassay to evaluate the effect of plant protection products (PPP) on non-target plants. Data derived from the seedling emergence and seedling growth test and from the vegetative vigour test are the basis to establish a dose-response relationship including EC50 value and regression equation. Therefore, test concentrations which produce 20 to 80 percent effect should be tested. Depending on plant species, the minimum number of test concentrations and replicates, the geometric progression for the graduation of test concentrations, and the suitable time course for the determination of end points can be variable. Within the demand for a standardized test design, the marked influence by the variability of growth habits using different plant species has to be taken into consideration in order to obtain the statistical power desired. Data from recommended plant species are presented according to their growth habits under test conditions and application of PPP in different test concentrations. The evaluation of the data was performed with the software ToxRat© for toxicity testing. Key words: non-target plants, bioassay, plant growth |
