FarmerK,
I like sulfur, we just used to sublimed it. Had less luck with using sulfur in any spray form.
We where early using yeast as a colonizer. We has mixed reults at first and then got pretty good at it. We took the idea from hot house strawberry growers. We had 5 good years of test data. Every time we added foliar nematodes for thrips prevention we added the yeast to the spray. We found that low pressure application of both the yeast and nematodes worked great. The trick with local yeasts is in the first rounds of collection, and getting reliable at identifying it. Later we started saving the local yeast by season and freeze drying samples. I wonder if Kansas state plant pathology has published any of the work we did with them?
I would might worry using Streptomyces spp. as a controller the ascomycite stage looks to close to other members of the family. I would want to make sure that what ever foliar fungal bio controls do not cause false positive for other tests. I know some growers who have played with Penicillin spp. And had some mixed results in Renuculus. Worth look at to. Streptomyces fruiting stalk and that fat section of the micylum looks, like aspergillosis.