Topics : Species and Forage Variety Trials : Species Fact Sheets : Brassica
Additional brassica information via the Forage Information System (FIS)
Once established, brassicas are very competitive with weeds. However, precautions should be made prior to planting to reduce weed competition during brassica establishment.
Insects, such as aphids, flea beetles, and imported cabbage worms, that feed on brassicas are not consistently a problem in Pennsylvania. However, appropriate use of insecticides may be warranted if insect populations become severe.
Diseases such as bacterial soft rot of brassica roots and leaf spot are generally not a problem until the plants near maturity. Stockpiling (delaying grazing until a later date than maturity) should not be attempted in fields were brassicas have high levels of foliar disease at maturity. Research has shown yield reductions of 40 percent when disease infected brassica crops were stockpiled for 45 days. Generally, Forage Star turnip and Rangi rape are better suited for stockpiling than other varieties because of lower disease infestation. To reduce disease occurrence, brassicas should not be grown on the same field for more than two consecutive years.