Pest of the week – Light Leaf Spot

Levels of Light Leaf Spot are rapidly increasing across the country, especially in susceptible varieties. The cycling nature of the disease means that it can rapidly spread and infect the newer leaves, causing a yield loss.

Prevention of the disease is much more effective than cure, and will stop leaf and stem symptoms appearing higher up the plant as it grows. The symptoms of the disease should not be confused with frost damage or nitrogen prill scorch, and can be identified easier if leaf samples are incubated for 3-4 days. The best description of the disease is a ‘dusty thumb print’.

Fungicides may be combined with PGR applications, but control of the disease should not be comprimised by delaying applications to coincide with a more suitable PGR timing. Crops should be inspected regularly to monitor levels of Light Leaf Spot and treated accordingly.

Light Leaf Spot in Oilseed Rape

Light Leaf Spot in Oilseed Rape

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