Common Kiwi Plant Diseases:
How to Identify and Treat

Kiwi plants, known for their delicious fruits and beautiful vines, can be vulnerable to various diseases. These diseases can affect the overall health and productivity of the plant if not properly identified and treated. In this article, we will discuss some of the common kiwi plant diseases, how to identify them, and the best ways to treat them.

1. Bacterial Canker

Bacterial canker, caused by the bacterium Pseudomonas syringae pv. actinidiae (Psa), is one of the most devastating diseases that affect kiwi plants. It primarily affects the vines and can lead to the death of the entire plant if not managed effectively.

Identification: Look for sunken, dark brown lesions on the trunk and branches. The cankers often ooze a sticky amber-colored substance. The leaves may also show wilting or yellowing.

Treatment: Unfortunately, there is no cure for bacterial canker once a plant is infected. The best approach is to prevent its spread. Remove and destroy infected plants, sterilize pruning tools between cuts, and practice good sanitation in the garden. Plant resistant cultivars if available.

2. Phytophthora Root Rot

Phytophthora root rot is a common fungal disease that affects many types of plants, including kiwi vines. It thrives in waterlogged or poorly drained soil conditions.

Identification: Look for wilting leaves that turn yellow or brown. The roots may appear dark and mushy when examined closely.

Treatment: Improve drainage in the affected area by adding organic matter to the soil and avoiding overwatering. Fungicides labeled for root rot can also be applied as a preventive measure.

3. Powdery Mildew

Powdery mildew is a fungal disease that affects many plants, including kiwis. It thrives in humid environments and can spread rapidly if left untreated.

Identification: Look for a white, powdery coating on the leaves, stems, and fruit. The affected areas may become distorted or stunted.

Treatment: Prune affected plant parts and improve air circulation by spacing plants adequately. Fungicides labeled for powdery mildew can be used to control the disease. Applying a thin layer of horticultural oil can also help prevent spore germination.

4. Crown Gall

Crown gall is a bacterial disease caused by Agrobacterium tumefaciens. It affects the roots and stems of kiwi plants, leading to the formation of large galls or tumors.

Identification: Look for irregularly shaped galls on the roots, crown, or stems. The galls may vary in size and can cause stunted growth.

Treatment: Prevention is key in managing crown gall. Use certified disease-free plants and avoid planting in areas known to be infested with the bacteria. Prune and destroy infected plant parts, disinfect tools between cuts, and practice good sanitation.

5. Anthracnose

Anthracnose is a fungal disease that affects many fruit-bearing plants, including kiwis. It can cause significant damage to the fruit and reduce its quality.

Identification: Look for dark, sunken lesions on the fruit, leaves, or stems. The lesions may have pink or orange spore masses in wet conditions.

Treatment: Remove and destroy infected plant parts. Improve air circulation by pruning and spacing plants adequately. Apply fungicides labeled for anthracnose as a preventive measure.

Conclusion

Identifying and treating common kiwi plant diseases is essential for maintaining the health and productivity of these beautiful vines. Regular monitoring of the plants, practicing good sanitation, and implementing preventive measures are crucial in preventing the spread of diseases. If you suspect a disease in your kiwi plants, it is always best to consult with a local gardening expert or plant pathologist for proper diagnosis and treatment recommendations. Remember, prompt action can save your kiwi plants and ensure a bountiful harvest.