The two fungicides they tested aren’t in common use in US orchards. One is no longer approved at all. Anyway, it would be interesting to test the currently actually used fungicides.
I very much doubt the problem magically disappears with "newer" pesticides.
Afterall, if a pesticide washed off in the rain, it wouldn't be much good as a pesticide .... it would be a very expensive proposition for the farmer to re-apply after each rainfall.
