Comparative Field Reaction of Sugarbeet and Several Cruciferous Crops to Nacobbus aberrans

摘要

Varieties of oil seed rape (Brassica napus L. and B. campestris L.), forage Brassicas (kale, B. oleracea L.; turnip, B. rapa L.; rape, B. napus L.; and a turnip x Chinese cabbage hybrid, B. rapa L. x B. pekinensis L.) and sugarbeet cyst nematode-resistant trap crops (radish, Raphanus sativus L., and mustard, Sinapis alba L.), all in the Brassicaceae (Cruciferae) family and sugarbeet (Beta vulgaris L.) in the Chenopodiaceae family, were evaluated for root galling in naturally infested field plots after 5 wk in 1992 and after 14 wk in 1993 for comparative reaction to the false root-knot nematode (Nacobbus aberrans Thorne and Allen), a root parasite of sugarbeet in eastern Wyoming. Nacobbus aberrans did not induce galls on any cruciferous crop. Incidence of sugarbeet with root galls was 41% in 1992 and 82% in 1993, while severity was 1.1 galls/root and 3.3 galls/root, respectively. Increased incidence of galling in 1993 appeared to be due to a longer period of evaluation with optimum so