Growing organic crops, which means avoiding even safe insecticides, has a down side. According to a notice from Michigan’s Department of Agriculture, a potentially serious threat to food production has been detected in the Mitten State. At risk is the state’s crops of cabbage, broccoli, cauliflower and related food plants. The pest, known as the Swede midge (Constarinia nasturii) has been detected in the state for the first time five organic production fields in Sanilac County, which borders Lake Huron. The above plants belong to a family called Brassicaceae (also called Cruciferae or crucifers).Widely cultivated, with many genera, species, and cultivars being raised for food production such the above-mentioned, as well as garden cress, bok choy, and brussels sprouts. The alternate name for the family (Cruciferae, New Latin for “cross-bearing”) is derived from the shape of their flowers, whose four petals resemble a cross. Ten of the most common cruciferous vegetables eaten by people, known colloquially as cole crops,[1] are in a single species (Brassica oleracea).
The larvae of the pest cause swelling and severe distortion of young plant tissues, resulting in the death of the growing tip or the development of blind or multiple heads in cruciferous plants. Secondary bacterial infections are common. The Swede midge is a threat to both conventional and organic growers, but organic growers may be at greater risk because they lack effective chemical control options.