Management
Controlling white rust is very difficult due to the nature of the Albugo pathogen. The method of control is tailored to specific crops and production systems. This is why identification of specific hosts (crops and possible weeds) is necessary to determine range and location of control methods.
Albugo proliferates in wet and moist conditions so movement through infected fields should be limited after spore maturation in these conditions to limit spread. Minimizing irrigation in cool and moist seasons as well as eliminating windbreaks to allow faster leaf drying can be beneficial. When infection is recognized, systemically infected plant material (including culled crops) should be completely removed and destroyed. Fields should be inspected every 7–14 days to remove additional material and monitor spread. On root crops, infected leaf removal either by mowing or plowing prior to harvest will limit the spread of the pathogen during harvest. Any susceptible plants or weeds should be mowed or eliminated to reduce spread.
Both conventional and organic fungicides are available and could be used to limit spread and yield losses during the spring, early summer and fall on crops and susceptible neighboring plants. Each of the 17 specific races of the white rust pathogen affects different plants so monitoring is essential as much as possible to limit overuse and cost of fungicide treatments. Common OMRI fungicides include sulphur, copper oxide, rosemary oil, and azadirachtin products. Common conventional fungicides include mefenoxam and fosetyl-aluminum products.
There are some resistant and partially resistant varieties which are necessary in landscapes where white rust is present. Long-term white rust persistence in fields is not an issue with all crops or in all states; however, non-susceptible crop rotation in infected fields for at least three years is widely recommended to limit establishment and wider dispersal of this pathogen from plant debris, soil, and perennial root material. This pathogen can eliminate viable production of susceptible crops in specific fields indefinitely if infection is widespread over many years.
Read more about this topic: Albugo
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