Bacterial Spot: A Common Problem for Apricot Trees
Bacterial spot is a disease that can affect apricot trees, as well as other stone fruits like peaches, plums, and cherries. It is caused by the bacterium Xanthomonas pruni, which spreads during wet weather with high humidity.
Symptoms of Bacterial Spot
The early signs of bacterial spot may not be immediately noticeable. However, as the disease progresses, it can cause:
- Small brown-black “spots” on the underside of leaves
- Irregularly shaped holes in leaves (also known as “bacterial shot hole”)
- Infected leaves may drop from the tree
- Infected fruit will also develop spots, which will deepen and crack as the fruit grows
Treating Bacterial Spot
Unfortunately, there is little that can be done to treat bacterial spot once it has become established. However, there are some preventive measures that can be taken to reduce the risk of infection.
Preventing Bacterial Spot
- Choose a well-draining planting site: Apricot trees need well-drained soil to avoid waterlogged conditions that favor the spread of bacteria.
- Provide ample sunlight: Apricot trees need plenty of sunlight to stay healthy and strong.
- Select resistant varieties: Some varieties of apricot trees are more resistant to bacterial spot than others. Ask your local nursery for recommendations.
Resistant Apricot Varieties
Two apricot varieties that are known for their resistance to bacterial spot are:
- Harcot
- Harglow
Conclusion
Bacterial spot can be a frustrating problem for apricot growers, but it can be prevented by taking the proper steps. By choosing a well-drained planting site, providing ample sunlight, and selecting resistant varieties, you can help to ensure healthy and productive apricot trees.
Additional Information
- Bacterial spot is most commonly spread during the springtime.
- The bacteria that cause bacterial spot can be found in cankers on trees.
- Infected fruit may become cracked and inedible.
- There are no effective treatments for bacterial spot once it has become established.
- Prevention is the best way to control bacterial spot.
