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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

The lowest NOER from an OECD 208 with six species tested was 20 mg/kg 3-hydroxy-1,1-dimethyl-butylperoxyneodecanoate dw.

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for terrestrial plants:
20 mg/kg soil dw

Additional information

A study was designed to assess potential effects of 3-hydroxy-1,1-dimethyl-butylperoxyneodecanoate on seedling emergence and seedling growth of six non-target terrestrial plant species following a pre-emergence application of the product on soil surface according to OECD 208 guideline and GLP requirements (Piskorski, 2015). Seeds of six different species (two monocotyledonae, four dicotyledonae) were exposed to soil treated with the test item at five treatment rates: 20, 50, 125, 312 and 780 mg a.i./kg dry soil.. The test item was applied to soil before sowing. The inhibition of the plant emergence and early growth was compared to the control plants over a study period of 21 days, after 50% emergence in the control group. At test termination, shoot fresh weight was determined. Out of the six plant species tested, lettuce (Lactuca sativa) showed to be the most tolerant as deduced from high values of ER50 and NOER based on seedling emergence, plant survival and fresh weight (ER50 and NOER values of > 780 and ≥ 780 mg a.i./kg dry soil for all three endpoints, respectively). Overall, wheat (Triticum aestivum) was the most susceptible with the lowest values of NOER based on emergence and fresh weight (50 and 20 mg a.i./kg dry soil, respectively). The study fulfilled all validity criteria from the OECD Guideline 208.