Tomatoes are garden favorites but face numerous diseases, pests, and physiological issues. Early identification and integrated management keep plants thriving.
| Disease | Symptoms | Management |
|---|
| Early Blight | Concentric rings on lower leaves, yellowing, defoliation | Rotate crops, mulch, stake, copper/chlorothalonil, resistant varieties ('Defiant', 'Iron Lady') |
| Late Blight | Water-soaked lesions, white fuzz underside, rapid death | Destroy infected plants immediately. Preventive copper. Resistant: 'Mountain Magic', 'Plum Regal' |
| Septoria Leaf Spot | Small dark spots, yellow halos, lower leaves first | Mulch, airflow, avoid overhead water, copper |
| Fusarium/Verticillium Wilt | Yellowing one side, vascular browning, plant death | Resistant varieties (V, F, N codes), rotation, soil solarization |
| Anthracnose | Sunken circular spots on ripe fruit | Mulch, harvest promptly, rotate |
| Powdery Mildew | White powder on leaves | Sulfur, potassium bicarbonate, resistant varieties |
Bacterial Diseases
- Bacterial Spot/Speck/ Canker: Small dark lesions, yellow halos. Copper sprays, clean seed, rotation, avoid wet work.
Viral Diseases
- TMV/ToMV (Mosaic): Mottled leaves, stunting. No cure. Remove plant. Wash hands/tools. Resistant varieties.
- Curly Top (Beet Leafhopper): Yellow, curled, stiff leaves. Row covers, weed control.
Physiological Disorders (Not Pathogens)
- Blossom End Rot: Black leathery bottom on fruit. Calcium uptake issue—consistent watering, mulch, avoid high N.
- Cracking: Radial/concentric cracks. Fluctuating water. Mulch, consistent moisture.
- Catfacing: Deformed blossom end. Cool temps during pollination. Row covers.
- Sunscald: White blisters on fruit. Excessive pruning/leaf loss. Maintain foliage.
Major Insect Pests
| Pest | Damage | Control |
|---|
| Tomato Hornworm | Defoliation, fruit eating | Hand-pick, Bt (Bacillus thuringiensis), parasitic wasps |
| Whitefly | Honeydew, sooty mold, viruses | Yellow sticky traps, insecticidal soap, Encarsia wasps |
| Aphids | Curled leaves, virus vector | Water blast, soap, ladybugs |
| Spider Mites | Stippling, webbing, bronzing | Hose blast, neem oil, predatory mites |
| Flea Beetles | Shot holes in leaves | Row covers, diatomaceous earth, trap crops |
| Cutworms | Seedlings cut at soil line | Collars, Bt, night hunt |
Prevention Foundation
- Crop rotation (3+ years, avoid Solanaceae).
- Disease-resistant varieties (read tags: V, F, N, T, A, St).
- Mulch (straw, plastic) – breaks soil-splash cycle.
- Stake/cage at planting – keeps fruit/leaves off soil.
- Drip irrigation – dry foliage.
- Sanitation – remove diseased tissue, clean tools.
- Soap spray (1 tsp castile/qt) weekly – broad suppressant.
Healthy tomatoes start with prevention. Walk your patch daily. Act fast. The harvest is worth the vigilance.
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