Use A Sharp Blade – Fight of Pest and Disease:
The type of mower does not matter, but the blade’s condition does. A dull blade tears at the grass. Take a close look at a grass blade a few days after mowing. If the bald is dull you will notice a jagged brown line across the tip of the cut grass. This is a good indication that your blade needs sharpening. Professional mowers sharpen their blades ‘about every 8 hours of use. For most homeowners, twice a year is recommended. The jagged edges caused by a dull mower blade make it more difficult for the grass to fight off pests and disease.