>Dave Cushman's site gives an LD-50 for Thymol of 100 ppm and the .06%
equates to 60ppm

>
> sorry I might be wrong but 100 ppm = 0.01%
>
> and 0.06% = 600 ppm
>
> can anyone comment?
>

I think Dave's LD-50 are based on rats and mus ie mamals.

Better what  Hanan A. Gashout and Ernesto Guzmán-Novoa says

 http://www.ibra.org.uk/articles/20090911_6

). In a subsequent experiment, topical applications of eight dilutions of
the above four selected products were carried out on adult worker bees and
larvae, using a newly-developed larval assay, to estimate their LC50s.
Thymol had the lowest LC50 for adult bees (210.3 μg / bee) and menthol had
the highest (523.5 μg /bee). Furthermore, thymol was the most toxic product
to larvae, with a LC50 of 150.7 μg / larva, while menthol was the least
toxic with a LC50 of 382.8 μg / larva.


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