Mural contains two active ingredients – azoxystrobin and benzovindiflupyr.
Resistance management strategies may include rotating with products having different modes of action or limiting the total number of applications per season.
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Are you noticing white spots on your crops that look like talcum powder, commonly called “colonies”? These can appear on leaves, stems, and flowers. Don’t wait for them to grow and potentially cover the entire plant. It’s a good idea to schedule an appointment with a Syngenta agronomist soon.
A proactive approach to rotating fungicides is essential for controlling powdery mildew effectively. By implementing the outlined strategy and integrating appropriate cultural practices, you can greatly reduce the risk of powdery mildew in your greenhouses. It’s important to recognize which crops are susceptible, and by consistently scouting and rotating effective fungicides, you’ll be able to preserve the visual appeal of your plants, keeping them free from the unattractive damage that powdery mildew can cause.
If not addressed, a significant infestation can lead to leaves yellowing and browning before they fall off, impacting the plant’s overall health and growth. While powdery mildew is typically first observed on the upper surface of leaves, it can also develop on the undersides. Therefore, it’s crucial to check both sides of the leaves when monitoring for this issue.
Key Symptoms to Observe
– Appearance of white, powdery spots or a coating on both sides of leaves, stems, and young flower buds.
– Poinsettia flower petals and bracts may also exhibit signs of infection.
– Leaves may start to turn yellow or brown.
– Distorted or undeveloped leaves and flower buds may occur.
– Overall plant growth may become stunted.
Conditions That Favour Powdery Mildew
– Temperatures ranging from 17°C to 22°C.
– Relative humidity levels of 70% or higher.
– Lower light intensity.
Moisture from dew or irrigation can help manage powdery mildew by preventing spore germination and killing the spores, rather than promoting growth.
Effective Prevention Strategies
– Keep a clean and dry growing environment.
– Check new plants for any signs of disease before introducing them.
– Perform weekly inspections of fully expanded leaves, particularly in lower to mid-canopy areas where airflow may be limited.
– Manage humidity levels through heating and ventilation as necessary.
– Remove any infected plants promptly to reduce the spread of spores.
– Overhead irrigation can assist in managing powdery mildew by rinsing spores away from the plants.
Prevention Strategies
To prevent the onset of powdery mildew, it’s essential to apply fungicides in a rotation every 14 days. If you encounter active infections, increase the frequency of applications to every 7 days for better control.