Strawberries with Leaf Scorch: Understanding and Managing the Disease
As a strawberry grower, you may have encountered a disease called leaf scorch. This disease causes leaves to turn brown or purple and wither, ultimately leading to reduced yield and quality of strawberries. In this article, we will discuss what leaf scorch is, its symptoms, and how to manage it effectively.
What is Leaf Scorch?
Leaf scorch, also known as angular leaf spot, is a bacterial disease caused by Xanthomonas fragariae. It affects strawberry plants during warm and humid weather conditions, especially when there is excessive moisture on the foliage. The bacteria enter the plant through natural openings or wounds, such as those caused by insects or mechanical damage.
Symptoms of Leaf Scorch
The first signs of leaf scorch are small, water-soaked spots that appear on the leaves. These spots usually have an angular shape and are bordered by veins. As the disease progresses, the spots turn brown or purple and become necrotic. The affected leaves may curl, wither, and drop prematurely. If left untreated, leaf scorch can cause significant damage to the plant and reduce yield and quality.
Management of Leaf Scorch
Preventing leaf scorch is key to managing the disease effectively. Here are some strategies you can use:
1. Plant Resistant Varieties
Some strawberry varieties are resistant to leaf scorch, such as 'Albion', 'Festival', and 'Monterey'. Planting these varieties can reduce the risk of the disease occurring in your field.
2. Practice Good Sanitation
Sanitation is crucial in preventing the spread of leaf scorch. Remove and destroy infected plants and plant debris from your field. Avoid working in wet fields or handling wet plants, as this can spread the bacteria.
3. Use Copper-Based Fungicides
Copper-based fungicides can be used to manage leaf scorch. Apply them preventatively during the growing season, especially during periods of warm and humid weather. Follow the label instructions carefully and avoid applying them during bloom time, as this can harm pollinators.
4. Control Insects
Insects can create wounds on strawberry plants that can serve as entry points for the bacteria that cause leaf scorch. Use appropriate insecticides to manage common pests such as thrips, mites, and aphids.
Leaf scorch is a bacterial disease that can cause significant damage to strawberry plants if not managed effectively. By planting resistant varieties, practicing good sanitation, using copper-based fungicides, and controlling insects, growers can reduce the risk of leaf scorch and maintain healthy and productive strawberry plants.
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