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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

The 265-d NOEC is 30 g (active ingredient) per ha.

Key value for chemical safety assessment

Additional information

The test substance was applied at 30 g active ingredient per ha to 6 m x 6 m plots permanent grassland in spring 1977, 1978, and 1979. Earthworms were sampled from untreated control, toxic standard and treated plots 2 months before and 1, 6, and 12 months after the first treatment and 12 months after the second and third treatments. The test substance applied at 30 g active ingredient per ha had no significant effect on total numbers, total weights, and numbers of individual species of earthworms. The only significant decreases were in immature Allolobophora chlorotica (P=1%) 1 and 12 months after the first treatment. However, pre-treatment numbers of immature A. chlorotica were low (P=5%) and this may have been partly responsible for these apparent significant reductions. Twelve months after the second and third treatments the numbers of immature A. chlorotica were not significantly different from controls (P=5%). Number of adult Lumbricus terrestris were low one month after the first treatment and twelve months after the third treatment (P=5%). On all other sampling occasions numbers were very similar to those on control plot. The test substance applied at a rate of 30 g active ingredient per ha, which is 10x the rate applied in maximum normal ‘gramoxone’ use, will not have any adverse effects on earthworm populations.