Suburban organic gardeners in Illinois usually protect their Brassica crops (kale, collards, cabbage, etc.) from cabbage moths and their caterpillars. But, brace yourselves for a new Brassica family pest challenge. The swede midge fly (Contarinia nasturtii), an invasive pest from Europe ,has begun wreaking havoc on brassica crops including also radish, horseradish, rutabaga, turnip, rapeseed (canola), arugula, bok choy and Chinese cabbage. Crops that are most damaged include common favorites such as broccoli, cauliflower, cabbage, kale, kohlrabi, collards and Brussels sprouts.

Environmental Pest Management (EPM) for organic food gardening is responsible environmental stewardship. Although EPM is modeled after the older Integrated Pest Management (IPM) it doesn’t allow use of toxic chemicals that are banned under the USDA organic standards. Contact your local botanic garden information service OR state university agricultural extension for help to identify treating pests. But only use the organic safe sprays we recommend in this post. Learn more about our growing method in two recently revised blog posts.