We normally try to offer un-treated seeds, as this seems to be the preference of most gardeners, but sometimes only treated seeds are available, in which case we choose to offer them instead of not being able to offer the seed at all.
We use treated seeds in our personal gardens every spring and have no qualms about using them. In some instances, especially with corn, we get poor results without treated seeds.
These treatments help prevent rotting in cold soil, resistance against insects and damping off.
Captan fungicide used as a vegetable seed treatment for the control of certain seed rots and damping-off diseases.
You should not eat seeds treated with Captan ( i.e. straight from the seed packet ), but of course you can use the seeds to grow food for human consumption
Thiram is a fungicide, ectoparasiticide, and animal repellent. It is used to prevent fungal diseases in seed and crops.
Like Captan, you should not eat seeds treated with Thiram ( i.e. straight from the seed packet ), but of course you can use the seeds to grow food for human consumption
Thiram MSDS Sheet ( Bayer CropScience )