3. Fungal Diseases: Powdery Mildew and Leaf Spot
Fungal infections spread rapidly, especially in humid or overcrowded conditions where air circulation is restricted.
Powdery Mildew
Powdery mildew appears as a fine, dusty white or gray coating across the tops of leaves, stems, and buds. It commonly attacks squash, cucumbers, roses, and zinnia varieties.
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Simple Fix: Improve air circulation by pruning dense foliage and spacing plants properly. Always water plants at the soil level rather than over the top of the leaves. To treat early infections, spray a mixture of one tablespoon of baking soda, half a teaspoon of liquid soap, and one gallon of water over the affected areas.
Black Spot and Rust
Fungal leaf spots present as dark brown or black spots surrounded by yellow halos, while rust appears as orange or rusty reddish bumps on the undersides of leaves.
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Simple Fix: Remove and dispose of infected leaves immediately—never add diseased plant material to your compost pile. Apply a copper-based or neem-oil organic fungicide to protect remaining healthy growth.
4. Root Rot: The Silent Killer
Root rot is one of the most destructive garden problems because it happens out of sight beneath the soil line. By the time symptoms appear above ground, serious damage has already occurred.
Symptoms
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Wilting leaves despite damp soil.
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Leaves turning yellow or black and dropping off.
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Soft, mushy stems near the soil surface.
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Soil that gives off a sour or foul odor.
Simple Fixes
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Stop Watering Immediately: Allow the soil to dry out significantly before applying any more water.
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Inspect and Prune Roots: Carefully lift potted plants from their containers. Healthy roots are crisp and white, while rotted roots are dark, slimy, and foul-smelling. Use sterile scissors to trim away damaged roots.
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Repot in Fresh, Well-Draining Soil: Replant in clean containers using potting mix blended with perlite, coarse sand, or pumice to ensure proper aeration and drainage.
