Now that our mango trees are in bloom, it's time to start thinking about fungus abatement. For those of us with larger collections, it doesn't make financial sense to purchase fungicides in small quantities (via Home Depot, Amazon, etc).
I found a place that sells a wide array OMRI listed products in bulk sizes at very reasonable prices. The place is called Seven Springs Farm (
http://www.7springsfarm.com/).
I've ordered from them in the past and had a really good experience. This year I ordered a flowable sulfur product called THAT (
http://www.7springsfarm.com/that-flowable-sulfur-2-5-gallon-on-sale/). It's not (yet) OMRI listed, but uses the same micronized sulfur that is found in powder OMRI listed products. Even with shipping, the overall price is really good. I could probably find a comparable product at a slightly better price by driving to AFEC or Helena Chemical, but the convenience of home delivery is awesome.