Curvularia leaf spot
Curvularia spp.
Also Known As - Leaf spot CurvulariaWhat is Curvularia leaf spot (Curvularia spp.)?
Curvularia blight, caused by various species of the Curvularia genus, can lead to thinning and decline. It manifests through irregular patches and streaks of damaged plants. Infected leaves show yellowing and browning, starting from the leaf tip and spreading across the surface. Leaf spots are common, especially on older leaves. The disease can also infect roots, stolons, and rhizomes, affecting the belowground parts of the plant.
How does Curvularia leaf spot (Curvularia spp.) occur?
Curvularia blight reproduces through the production and dispersal of spores. The fungus forms mycelia, which are thread-like structures, on infected and dead plant tissues. These mycelia produce spores that are released into the environment. The spores can be spread by wind, water, or human activities such as mowing or walking on infected turf. When the spores land on susceptible plant, they can germinate and infect the plant, initiating new infections and continuing the disease cycle.
Symptoms
1 - Impact on Plants
• Curvularia leaf spot adversely impacts plants, leading to thinning out and decline, weakening their growth. • The leaves turn yellow and brown, affecting the plant’s overall appearance. Furthermore, it reduces vigor and growth, making the plants more susceptible to various stressors.
3 - Impact on the Environment and soil
• Curvularia leaf spot has negative impacts on the soil and environment. It reduces important ecosystem services such as erosion control, water filtration, and heat mitigation. • The disease contributes to the loss of biodiversity and disrupts habitats.
Solutions
1 - Cultural Practices
• Avoid overwatering and drought stress by irrigating according to the specific needs of the plant. • Fertilize appropriately to promote moderate growth and enhance the plant's resistance. • Maintain a higher mowing height to provide shade and reduce stress on the plant. • Manage thatch by keeping its thickness under 0.5 inches. • Avoid planting shade trees near the areas.
2 - Sanitation And Resistant varieties
• Remove and destroy infected plant debris to minimize the source of inoculum. • Ensure good soil drainage to prevent waterlogging and root stress. • When available, choose varieties that are less susceptible to Curvularia blight.
3 - Fungicide Treatment
• Some commonly used fungicides for controlling Curvularia include chlorothalonil (Daconil® and Bravo®) and iprodione (Chipco® 26019 and Rovral®). • However, it's important to follow label instructions and consult with local experts for specific fungicide recommendations and proper application guidelines.
