Management
Cultural methods such as removing stubble and crop rotation can be very effective. By removing the stubble, overwintering pseudothecia and mycelium are less prevalent, reducing the risk of infection. In Canada, crop rotation decreases blackleg dramatically in canola crops. It is suggested to have a 3 year crop rotation of canola and to plant non-host plants such as cereals in between these periods. Chemical methods, such as the application of fungicides, can decrease instances of disease. EBI and MBC fungicides are typically used. EBI fungicides inhibit Ergosterol biosynthesis whereas MBC fungicides disrupt beta tubuline assembly in mitosis. EBIs are the best option for control of L. maculans as they inhibit the growth of conidia. Although fungicides such as EBIs are effective on conidia, they have no effect on ascospores which will grow regardless of the fungicide concentration. Resistance methods can also be used to great effect. Typically race specific Rlm genes are used for resistance (Rlm1-Rlm9) in Brassica napus crops.
Read more about this topic: Leptosphaeria Maculans
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