Trichderma is a disease that only shows symptoms in the greenhouse. Symptoms will not show in the cooler because the roots are not damaged (as a result of drying out, high temperatures, etc.) yet. Use a labeled sanitizing product to clean all areas you will handle the bulbs. Thorough cleaning of planting surfaces, crates, carts, shelves can reduce inoculum sources and help to maintain crop health. This is the first step!