Why do tomato plants get blight?

One of the biggest challenges facing tomato growers is blight. This fungal disease can quickly devastate a tomato crop, causing leaves to wilt, stems to rot, and fruit to turn brown and rot. But why do tomato plants get blight? Here are some of the key reasons this disease can take hold:

1. Wet weather

The main trigger for blight is wet weather. The fungus that causes the disease thrives in moist conditions, which means that tomato plants are most vulnerable during periods of heavy rain or high humidity. If your tomato plants are exposed to prolonged wet weather conditions, blight is likely to take hold.

2. Poor air circulation

In addition to wet weather, poor air circulation can also contribute to blight. If your tomato plants are crowded together or located in a spot with little air flow, the moisture level around them will be higher, making them more susceptible to infection. That's why it's a good idea to plant your tomatoes with plenty of space between them, and to prune away any excess foliage to improve air circulation.

3. Soil-borne pathogens

In some cases, blight can be caused by soil-borne pathogens that linger in the soil from year to year. If you've had blight in your tomato patch before, it's important to replace the soil or sterilize it before planting new tomatoes. You can also rotate your tomato crop to a different area of your garden to prevent the buildup of fungal spores in the soil.

4. Infected seeds or plants

Finally, blight can be introduced to your garden through infected seeds or plants. To prevent this, choose seeds and plants from a reputable supplier, and inspect them carefully for signs of disease before planting. If you do spot any signs of blight, remove the plants immediately to prevent the disease from spreading.

By understanding these factors that can contribute to blight, you can take steps to protect your tomato crop and keep your garden healthy. Whether it's through careful planting, proper soil management, or vigilant inspection, there are many strategies you can use to prevent blight and enjoy a bountiful tomato harvest.