 A variety of cultural controls are effective against sorghum downy mildew.In areas where oospores are the principal source of inoculum, such as in the United States, crop rotation is an effective strategy, as oospores will be stimulated to germinate by both host and non-host crops, but will not be able to infect plants apart from corn, sorghum, and Johnson grass.Flax ("Linum usitatissimum") is an example of a trap crop that is used to reduce the amount of oospore inoculum in the soil, before planting a susceptible crop like sorghum or maize.