Only if dusted on the plant and that has the potential to cause health problems if you do not wear proper protective attire.

You are absolutely correct about being very careful when using DE, petzold. The same warning holds true with most pesticidal (fungicide, herbicide, insecticide, etc.) products, though. We don't seem to think about that often enough.

Darn, I forget to mention that DE is hazardous to all insects, so be forewarned. It is every bit as dangerous to your beneficials as it might be to the others.

I used to use DE in the garden occasionaly but now only sprinkle it on the soil of my outdoor container plants.