Diatomaceous earth exists at several places in Yezo.
There are organic products, such as diatomaceous earth, that are very effective against fleas and also safe to use around cats.
Or sprinkle diatomaceous earth around affected plants.
You can also use diatomaceous earth; the kind you find in the garden center, not the kind for pools.
Zelinkia and Philosyrtis are two slightly aberrant forms described by Giard from certain diatomaceous sands.