The big riding mowers will in fact kill the grass (healthy or otherwise)m anyplace where a tight turn is required. The inside wheel turns faster and literally rubs the life from the affected spot.
After several years of dealing with the same problem, we had all sharp curves eliminated from our landscaping. Problem solved....no more dead grass.
We also changed to lawn keepers who use walk behind mowers. Contributes significantly to a healthier lawn.
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