I recently did a tree infusion into the trunk flares of an oak for oakwilt. The uptake went real slow and I suggest that you add a penetrant in the formula to help with the uptake I used two parts water on one part chemical. Did a 20 ml per inch dbh on 40 h2o. Have to see what the tree will do in 2020. I also believe the fungus already may have spread to this seemingly healthy tree. That may be why uptake was slow
Whether my brown spot problem is more difficult than other readers that have left reviews, it just seems like I'm either not treating this lawn problem with enough fungicide because I have certainly been consistent in retreating and I'm still having problems. Have cut way back on watering so that's not the problem just doesn't seem to be stopping the spread.