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Treating Tomato Leaf Spot with Copper Fungicide

Black spots on tomato leaves = fungal disease (early blight, septoria). Copper fungicides work best. Soap Shield (copper + fatty acids) adheres well, lasts long, and doesn't need sulfur mixing.

Application

Spray at first sign, repeat per label (usually 7–10 days).
Combine with mulching, staking, and base watering to reduce spread.

Product link: Gardens Alive Soap Shield.

Growing Vegetables: Red Spots on Schefflera: Likely Injury, Not Disease; Tomato Seedling Spots: Need Photo and Seed Source; Chronic Fungal Spots on a 30-Year-Old Prickly Pear (Opuntia); Aloe Plant Black Spots: Insect Damage, AC Stress, and Treatment; Black Marks on Phalaenopsis Flowers: Fungus, Sooty Mold, or Aging?; Nepenthes 'Miranda' Black Spots: Severe Light Deficiency; Yucca Black Spots: Fungus, Bacteria, or Scale?; Black Spots on Philodendron Xanadu: Harmless or Scale Insects?; Tomato, Pepper, Cucumber Decline in South Florida: Root Fungus, Nematodes, or Virus?; Black Spot Disease (Diplocarpon rosae): Fungal Leaf Spots With Fringed Edges

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