Orange dust on grass
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What's Causing Your Grass Lawn To Turn Orange
Grass that suddenly appears to have a corroded orange-like appearance most likely has a fungal disease called “lawn rust,” which usually first appears as yellow spots.
These spots result in an orange and red dust that coats the blade, which easily transfers when touched and will leave your fingers discolored if you touch the grass.
Grass rust is most rampant in late summer and early fall when outside conditions are warm, humid, shaded, and wet, spreading quickly from contact or the wind.
The wet environment of standing water in your lawn and even overnight dew that’s slow to dry out can result in the fungal infection thriving and spreading.
Due to the grass blades being covered in the orange fungal infection, your lawn won’t be able to absorb the sunlight needed for photosynthesis.
If the grass doesn’t absorb sunlight properly, it will not produce the food it needs to survive and grow, slowly beginning to decay until it completely dies
Dying grass becomes more susceptible to other issues, like pests or other outdoor diseases; however, you can reduce the effects of rust fungus and even prevent its return.
Simple steps like adjusting the mower’s blade height to at least 3 inches and watering your grass in the morning rather than at night can help fight the fungal infection.