Incorporate rapeseed in mid-March of the spring potatoes are to be planted. Note that the ability of rapeseed to decrease nematode populations is specific to the nematode type. For example, Dwarf Essex has not successively reduced the populations of root lesion or dagger nematodes in berry field trials. These characteristics increase palatability for human and animal consumption. Oil from other varieties generally is used only for industrial purposes.
All varieties grow similarly and provide biomass and N uptake.
However, industrial types are most likely to reduce nematode populations. This effect results from their higher levels of glucosinolate, which is believed to be the active agent in nematicidal activity. If you want to print this publication, we recommend downloading the PDF version. This publication also is part of Using Cover Crops in Oregon, EM 8704, which contains an overview of cover crop usage and descriptions of 13 individual cover crops. We offer discounts on orders of 100 or more copies of a single title.