Hi has anyone had any experience with Plantshield (Trichoderma) I think it is also called Rootshield as a dusting on calla tubers. The directions say that it can be dusted on tubers before planting or used as a drench. I have seen some literature that said it is best to incorporate into the soil before planting but I do not have a rate for that use. Has anyone used this product and do you know of any benefits of incorporating over dusting the tubers? Thanks in advance