Does Fungicide Kill Mycorrhizae?

No fungicide eradicates mycorrhizae; they only decrease development for a short time after application. The time of this effect depends on the duration in which the chemical persists in the environment.

What other conditions kill mycorrhizal fungi?

Research has shown that once a root is colonized by a myc- orrhizal fungus, it is more resistant to infection by disease organisms. Long fallows, heavy tillage and certain agricultural chemicals are known to kill or suppress mycorrhizae and other soil life.

What can kill mycorrhizae?

Pesticides applied to the foliage of plants generally do not have any adverse effects on mycorrhizae formation or function. Some fungicides applied to soil do inhibit mycorrhizae; soil fumigants can kill mycorrhizal fungi.