Are fumigants harmful to most organisms?

Fumigants are indeed harmful to most organisms, which is why they are used in pest management. They are designed to eliminate or control pests, and this includes a wide range of organisms, not just limited to terrestrial species. While it might seem plausible that aquatic species could be less affected, many fumigants can dissolve in water or become part of the aquatic environment, potentially affecting aquatic life as well.

The nature of fumigants means that they target organisms by disrupting biological processes. This effect is broadly applicable across many types of organisms, including insects, plants, and vertebrates. Thus, the correct perspective is that fumigants pose risks to a wide variety of organisms, including both terrestrial and aquatic species, rather than being harmless to aquatic life or only affecting certain terrestrial organisms.