How to Tell if Your Tomato Plant Has Blight

Tomato blight is a common and devastating fungal disease that can affect tomato plants, causing leaves to yellow and wither, fruit to rot and fall prematurely, and the eventual death of the plant. Spotting blight early is critical to minimize damage and save your tomato harvest. Here are some ways to tell if your tomato plant has blight:

Yellowing Leaves

One of the first signs of blight is yellowing of the leaves, starting from the lower parts of the plant and moving upward. The yellowing leaves may also have black or brown spots, and the affected leaves will eventually wither and die. This is because the fungus attacks the leaves and restricts their ability to absorb nutrients and moisture.

Rotting Fruit

If your tomatoes start to rot and fall off the plant before they are fully ripe, this is another indicator of blight. The fruit will have brown or black spots and will feel mushy or soft to the touch. This is because the fungus attacks the fruit and causes it to rot from within.

Black Stems and Spots

Blight can also cause black spots or streaks on the stems and branches of the tomato plant. These spots may become larger and darker over time, eventually killing the plant. A simple way to check if the stems are affected is to scrape away a small section of the bark with a knife. If the tissue underneath appears discolored or black, the plant may have blight.

White Mold and Mildew

Blight can also cause a white powdery coating on the leaves and stems of the tomato plant, which is a sign of mildew. This is because the fungus thrives in warm, moist conditions, so areas with poor air circulation, high humidity, and wet soil are particularly susceptible.

Preventing and Treating Blight

The best way to prevent blight is to practice good gardening hygiene. This means avoiding over-crowding of plants, watering plants in the morning and not at night, and maintaining good airflow throughout the garden. If you suspect your tomato plants have blight, remove the infected leaves, fruits, and stems immediately and dispose of them offsite. Chemical fungicides are also available, but these should be used sparingly and only as a last resort.

In conclusion, detecting and treating blight early is crucial to save your tomato plants and harvest. Keep an eye out for any signs of yellowing leaves, rotting fruit, black stems and spots, and white mold and mildew. Follow the prevention and treatment tips outlined above to minimize the damage and optimize your tomato harvest.