Yes you can, and Trichoderma often spreads this way.
Either soak them in a 10% bleach and water solution for 30 minutes or wipe them down with rubbing alcohol to kill any mold spores.
How do you kill Trichoderma?
Although it's vital that moisture levels be lowered, that's never enough on its own. Active Trichoderma mold and spores must be completely killed as part of the action plan. Bleach is not considered an effective way to kill any mold on porous surfaces. For best results, use a non-toxic, odor-free registered fungicide.
Does peroxide kill Trichoderma?
Before using the cornmeal, it's okay to use hydrogen peroxide first to kill or reduce at least some of the harmful fungus. The hydrogen peroxide can then be rinsed off or given a little time to break down so that it won't inhibit the Trichoderma.
