Gugino B K, Abawi G S, Ludwig J W
Post-doctoral Fellow and Professor and Research Technician, Department of Plant Pathology, Cornell University, New York State Agricultural Experiment Station, Geneva, NY 14456.
J Nematol. 2006 Dec;38(4):483-90.
The northern root-knot nematode (Meloidogyne hapla) is a major pathogen of processing carrot in New York, significantly reducing marketable yield and profitability. Severely infected carrots are stubby, galled and forked and therefore unmarketable. In field microplot trials in 1996 and 1998, the incidence and severity of root-galling increased and the marketable yield of carrot decreased as the initial inoculum density of M. hapla was increased from 0 to 8 eggs/cm(3) soil, in mineral or organic soils. The application of oxamyl at planting was effective against M. hapla and its damage to carrots grown in mineral and organic soils. Oxamyl application reduced root-galling severity and increased marketable yield. In commercial fields, the cost-effectiveness of oxamyl application was related to the level of soil infestation with M. hapla.
北方根结线虫（Meloidogyne hapla）是纽约加工胡萝卜的主要病原菌，会显著降低可销售产量和盈利能力。严重感染的胡萝卜粗短、生瘤且分叉，因此无法销售。在1996年和1998年的田间小区试验中，随着北方根结线虫的初始接种密度从0增加到8个卵/立方厘米土壤（在矿质土或有机土中），根瘤的发生率和严重程度增加，胡萝卜的可销售产量下降。种植时施用杀线威对北方根结线虫及其对矿质土和有机土中生长的胡萝卜的损害有效。施用杀线威降低了根瘤严重程度并提高了可销售产量。在商业田地中，施用杀线威的成本效益与土壤中北方根结线虫的侵染水平有关。
