Common Diseases That Kill Tomato Plants

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Common Diseases of Tomatoes Part II Diseases Caused by Bacteria


Tomatoes are one of the most popular and widely grown vegetables in home gardens. They are not only delicious to eat but also packed with essential nutrients. However, tomato plants can be susceptible to various diseases that can cause them to wither and die. In this article, we will discuss some of the common diseases that can kill tomato plants and how to prevent them.

Fusarium Wilt

Fusarium wilt is a fungal disease that affects the roots of tomato plants. It is caused by the soilborne fungus Fusarium oxysporum. The fungus enters the plant through the roots and blocks the xylem vessels, preventing the plant from taking up water and nutrients. Infected plants exhibit wilting, yellowing of leaves, and stunted growth. To prevent Fusarium wilt, choose resistant tomato varieties, practice crop rotation, and maintain good soil drainage.

Early Blight

Early blight is a fungal disease caused by the fungus Alternaria solani. It affects the leaves, stems, and fruits of tomato plants. Infected plants display dark, concentric rings on the leaves, which eventually turn yellow and die. To prevent early blight, remove infected plant debris, water the plants at the base, and apply fungicides if necessary.

Late Blight

Late blight is another fungal disease that can quickly kill tomato plants. It is caused by the oomycete pathogen Phytophthora infestans. Infected plants show water-soaked lesions on the leaves, which turn brown and papery. The disease spreads rapidly in cool, wet conditions. To prevent late blight, avoid overhead watering, provide adequate air circulation, and remove infected plants immediately.

Bacterial Spot

Bacterial spot is a common disease caused by the bacterium Xanthomonas campestris. It affects the leaves, stems, and fruits of tomato plants. Infected plants develop dark, sunken lesions on the leaves and fruits. The disease spreads through splashing water, so avoid overhead watering and remove infected plant debris. Copper-based fungicides can also be used to control bacterial spot.

Verticillium Wilt

Verticillium wilt is caused by the soilborne fungus Verticillium dahliae. It affects the vascular system of tomato plants, causing wilting and yellowing of leaves. Infected plants may have stunted growth and produce fewer fruits. To prevent Verticillium wilt, choose resistant tomato varieties, practice crop rotation, and maintain good soil fertility.

Tomato Mosaic Virus

Tomato mosaic virus is a viral disease that affects tomato plants. Infected plants display mosaic-like patterns on the leaves, which can become distorted and stunted. The virus is primarily spread through contact with infected plants or contaminated tools. To prevent tomato mosaic virus, practice good hygiene, remove and destroy infected plants, and avoid working with plants when hands are wet.

Gray Mold

Gray mold, caused by the fungus Botrytis cinerea, can affect various parts of tomato plants, including leaves, stems, and fruits. Infected plants develop fuzzy, gray mold on the affected areas. The disease thrives in cool, humid conditions. To prevent gray mold, provide adequate air circulation, avoid overhead watering, and remove infected plant debris promptly.

Root Knot Nematodes

Root knot nematodes are microscopic worms that can cause significant damage to tomato plants. They invade the roots, causing the formation of galls or knots. Infected plants exhibit stunted growth, wilting, and yellowing of leaves. To prevent root knot nematodes, practice crop rotation, use resistant tomato varieties, and maintain good soil health.


Knowing the common diseases that can kill tomato plants is essential for maintaining a healthy garden. By taking preventive measures and implementing good gardening practices, such as crop rotation, proper watering, and regular inspection, you can minimize the risk of these diseases and ensure a successful tomato harvest.

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