Leaves, buds, and roots are all alike sensitive to this toxic effect, the nature of which is not yet understood.
"Hopped" wort exerts a toxic effect upon many bacteria, including the lactic acid bacteria.
But I wish to attest in passing that the mere witnessing of these free scenes had a tonic as well as toxic effect on me.
Some may have said that the trees were having a toxic effect upon the soil.
The older writers recognised the toxic effect of lead on the nervous system.