Common Tomatillo Plant Diseases:
How to Identify and Treat

Tomatillos are a popular vegetable in many gardens, known for their tart flavor and versatility in various culinary dishes. However, just like any plant, they are susceptible to diseases that can affect their growth and overall health. In this article, we will discuss some common tomatillo plant diseases, how to identify them, and the best ways to treat and prevent them.

1. Early Blight (Alternaria solani)

Early blight is a fungal disease that affects many plants, including tomatillos. It typically starts as small, dark spots on the lower leaves of the plant, which eventually grow and merge together. As the disease progresses, the leaves turn yellow and eventually die off.

To treat early blight, it is important to remove any infected leaves or branches immediately. Fungicides can also be used to help control the spread of the disease. Additionally, practicing good garden hygiene by spacing plants adequately and ensuring proper air circulation can help prevent early blight.

2. Late Blight (Phytophthora infestans)

Late blight is another fungal disease that affects tomatillos, as well as tomatoes and potatoes. It typically appears as water-soaked lesions on the leaves, which eventually turn brown and become necrotic. The pathogen responsible for late blight thrives in cool and moist conditions.

To control late blight, it is crucial to remove any infected plant material immediately to prevent further spread. Fungicides can also be used to manage the disease. However, prevention is key in dealing with late blight. Avoid overhead watering and ensure proper spacing between plants for adequate air circulation.

3. Verticillium Wilt (Verticillium spp.)

Verticillium wilt is a soilborne fungal disease that affects a wide range of plants, including tomatillos. It causes wilting and yellowing of the leaves, starting from the lower parts of the plant and progressing upwards. The fungus clogs the plant’s vascular system, preventing the adequate flow of water and nutrients.

Unfortunately, there is no cure for verticillium wilt once a plant is infected. The best course of action is to remove and destroy the infected plant to prevent further spread. Crop rotation is crucial in preventing the disease, as it can persist in the soil for several years. Avoid planting susceptible plants, such as tomatoes or peppers, in areas where infected plants were previously grown.

4. Fusarium Wilt (Fusarium oxysporum)

Fusarium wilt is another soilborne fungal disease that affects tomatillos. It causes wilting of the plant, starting with the lower leaves and progressing upwards. The leaves may also turn yellow or exhibit stunted growth. The fungus attacks the plant’s vascular system, similar to verticillium wilt.

Similarly to verticillium wilt, there is no cure for fusarium wilt. Infected plants should be removed and destroyed to prevent further spread. Practicing good garden hygiene and crop rotation are essential in preventing the disease from affecting future crops.

5. Powdery Mildew (Erysiphe cichoracearum)

Powdery mildew is a common fungal disease that affects many plants, including tomatillos. It appears as a white, powdery coating on the leaves, stems, and fruits of the plant. In severe cases, it can cause distortion and stunting of the plant.

To treat powdery mildew, it is important to remove any infected plant material immediately. Fungicides can also be used to control the spread of the disease. Additionally, ensuring proper air circulation and avoiding overhead watering can help prevent powdery mildew from taking hold.

6. Bacterial Spot (Xanthomonas campestris pv. vesicatoria)

Bacterial spot is a bacterial disease that affects tomatillos, as well as tomatoes and peppers. It appears as dark, water-soaked lesions on the leaves, stems, and fruits of the plant. As the disease progresses, the lesions may turn brown or black and become necrotic.

To manage bacterial spot, it is important to remove any infected plant material immediately. Copper-based fungicides can also be used to help control the spread of the disease. Avoid overhead watering and ensure proper spacing between plants for adequate air circulation.

In conclusion, being able to identify common tomatillo plant diseases is crucial in maintaining a healthy crop. Early detection and appropriate treatment can help prevent further spread and minimize crop loss. Additionally, practicing good garden hygiene, such as proper spacing and crop rotation, can significantly reduce the risk of diseases affecting your tomatillo plants. By being proactive and implementing preventive measures, you can enjoy a bountiful harvest of delicious tomatillos year after year.