Manganese sulphate is what to use to sure a diseased queen palm tree. I sprinkled a bag around the base of the tree about 1.5 ft away froj the trunk. I made sure the roots were wet before I sprinkled, then I ran the sprinkler for 30 minutes to let it soak in. I hope it does not kill the grass or burn the roots. I took every precaution...we'll see.