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White Leaf Spot

Mycosphaerella capsellae (Pseudocercosporella capsellae)

White Leaf Spot

Mycosphaerella capsellae (Pseudocercosporella capsellae)   

Pathogen

Fungus

Hosts

Oilseed Rape, brassicas and cruciferous weeds such as such as shepherd`s purse and charlock.

Symptoms

Small, white spots (up to 20 mm in diameter) which darken to grey/black spots on leaves as the season progresses.

Development

The disease develops in the early spring by means of ascospores released from infected rape stubble and other susceptible brassicas. Secondary spread within crops is by conidia which are dispersed by rain-splash. Infected seed can also be a source of infection.

Favourable Factors

Cool, wet conditions with associated leaf wetness in the spring.

Importance

Localised infections have occurred on winter crops in Southern England, but the disease is generally of little economic importance in the UK.

Control

• Control is not usually necessary in the UK
• Destroy or dispose of stubble as soon as possible after harvesting
• Foliar fungicides can give useful levels of control.

White Leaf Spot A1 LibWhite leaf spot leaf symptoms
White Leaf Spot A2 LibWhite leaf spot leaf symptoms

Identification and Management of OSR diseases

Find out more information on the key disease threats to your oilseed rape crop. For each disease you will find out the importance of the disease in terms of potential yield penalty, how to identify the disease in its early stages and our advice on the best control strategies.

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