Schwarz Tanner, Jennings Katherine, Gorny Adrienne
Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695.
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695.
J Nematol. 2024 Apr 22;56(1):20240017. doi: 10.2478/jofnem-2024-0017. eCollection 2024 Mar.
Weeds that compete with valuable crops can also host plant-parasitic nematodes, acting as a source of nematode inoculum in a field and further damaging crops. The host status of 10 weed species commonly found in North Carolina, USA, was determined for the root-knot nematodes and race 4 in the greenhouse. Each weed species was challenged with 5,000 eggs/plant of either or race 4, with five replicate plants per treatment in two separate greenhouse trials. Root galling severity and total number of nematode eggs per root system were recorded 60 days after inoculation. Reproduction factor (Rf = final nematode population/initial nematode population) was calculated to determine the host status of each weed species to and race 4. Four weed species ( and ) were poor hosts (Rf < 1) to both nematode species, and roots of these weed plants did not display galling. Four weed species ( and ) were hosts (Rf > 1) to both nematode species, and all had observable root gall formation. and were poor hosts to but susceptible hosts to . This study documents a differential host status of some common weeds to and race 4, and these results highlight the necessity of managing root-knot nematodes through controlling weeds in order to protect valuable crops.
与珍贵作物竞争的杂草还可能寄生植物寄生线虫，成为田间线虫接种体的来源，进而损害作物。在美国北卡罗来纳州常见的10种杂草对根结线虫和4号小种的寄主状况在温室中进行了测定。每种杂草用5000个南方根结线虫或4号小种的卵/株进行接种，每个处理有5株重复植株，在两个独立的温室试验中进行。接种60天后记录根瘿严重程度和每个根系线虫卵的总数。计算繁殖因子（Rf = 最终线虫种群/初始线虫种群）以确定每种杂草对南方根结线虫和4号小种的寄主状况。四种杂草（苘麻和藜）对两种线虫都是不良寄主（Rf < 1），这些杂草植株的根没有出现瘿瘤。四种杂草（反枝苋和刺黄花稔）对两种线虫都是寄主（Rf > 1），并且都有明显的根瘿形成。苘麻和藜对南方根结线虫是不良寄主，但对4号小种是敏感寄主。本研究记录了一些常见杂草对南方根结线虫和4号小种不同的寄主状况，这些结果突出了通过控制杂草来管理根结线虫以保护珍贵作物的必要性。
