White Leaf Spot
Mycosphaerella capsellae (Pseudocercosporella capsellae)
Mycosphaerella capsellae (Pseudocercosporella capsellae)
Mycosphaerella capsellae (Pseudocercosporella capsellae)
Fungus
Oilseed Rape, brassicas and cruciferous weeds such as such as shepherd`s purse and charlock.
Small, white spots (up to 20 mm in diameter) which darken to grey/black spots on leaves as the season progresses.
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.
Cool, wet conditions with associated leaf wetness in the spring.
Localised infections have occurred on winter crops in Southern England, but the disease is generally of little economic importance in the UK.
• 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 leaf symptoms
White leaf spot leaf symptomsFind 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.