Hello Karen,

You're already doing a lot of the right things—natural grub control, overseeding with Eco-lawn, and avoiding synthetic chemicals. That’s a solid foundation for a resilient lawn. The white fungus spots you're seeing are likely symptoms of dollar spot, a common turf disease in Michigan during warm, humid conditions. More information at these links:

Dollar Spot - Turf

Turfgrass Diseases: Dollar Spot (Causal fungus: Clarireedia jacksonii)

It’s often triggered by low nitrogen levels in the soil, especially when the grass is growing slowly. More information at this link:

Dollar Spot - Turf

Nutrient Considerations for Preventing Dollar Spot

Here’s what you can focus on:

Nitrogen (N)

Dollar spot thrives in turf with insufficient nitrogen.

Apply light, frequent doses of organic nitrogen sources (like composted manure, alfalfa meal, or feather meal) in spring and early summer to maintain steady growth. More information at this link:

Dollar Spot - Turf

Moisture Management

Ironically, dollar spot is more severe in dry soils despite appearing in humid weather.

Maintain consistent moisture through deep, infrequent watering. Avoid drought stress.

Thatch Reduction

Excess thatch can harbor fungal pathogens.

Aerate and topdress with compost to break it down naturally.

Potassium (K)

While not directly linked to dollar spot, potassium helps with overall stress tolerance.

Organic sources like greensand or sulfate of potash magnesia can be beneficial.

Calcium (Ca) and Magnesium (Mg)

These support cell wall integrity and photosynthesis.

Consider dolomitic lime if your soil test shows a deficiency and pH is low.

Soil Testing: Your Best Ally

Before applying anything, a soil test is essential. Michigan State University Extension offers testing services that can pinpoint deficiencies and guide your organic amendments. For soil testing, check out this link:

Soil testing through MSU Extension - Soil Health

Cultural Practices That Help

Mow at the right height: Keep blades sharp and avoid scalping.

Remove morning dew: A quick pass with a hose or broom reduces the duration of leaf wetness.

Increase air circulation: Trim nearby shrubs or trees to reduce humidity around the turf.

I hope this helps!