Black Spot on Roses and Lawn Fungus in Chicago

Rose Black Spot Home Remedy

Black spot on roses (round black spots, yellowing leaves) is treatable with a homemade baking soda spray (2 tbsp per gallon, spray tops and undersides of leaves). The respondent directs the user to the Roses forum for the full recipe.

Lawn Fungus and Shade

The lawn has recurring fungus, brown patches, and dead grass. Scotts fungicide doesn’t cure existing fungus. The yard faces west—back gets morning sun (8 AM–3 PM), front gets afternoon sun (12–6 PM). This partial shade weakens Kentucky bluegrass and invites fungus.

Grass Recommendation

Switch to ‘Supernova’ (Supina) bluegrass—the most shade-tolerant, wear-resistant cool-season grass. Mix with white clover for natural nitrogen. Overseed now with tall fescue for quick cover in semi-shade; it handles Chicago heat. Avoid all chemicals; they weaken grass and kill beneficial microbes.

Tree Seedlings

Neighbor’s tree seeds sprout everywhere. Mow or pull them before seeding new grass. No chemical control needed.