Echinacea species are reported for a large content of bioactive compounds, but their effects on phytoparasitic nematodes are still unknown. This study comparatively investigated the in vitro activity of chemically characterized extracts from E. angustifolia, E. pallida and E. purpurea on juveniles and eggs of the root-knot nematode Meloidogyne incognita. Suppressiveness of soil amendments with Echinacea plant biomasses was also investigated against M. incognita on tomato in potting mixes. More than 50% juvenile mortality occurred after a 48-h exposure to a 500 µg mL⁻¹ solution of all Echinacea extracts, as well as more than 50% of M. incognita eggs did not hatch after a 1-week exposure to the same concentration of E. angustifolia extracts. Nematode multiplication on tomato roots was always significantly reduced in soil amended with all Echinacea biomasses, as well as almost all treatments also resulted in a significant tomato growth increase. Polar compounds such as echinacoside and chicoric acid were the main components of the extracts from Echinacea aerial parts, whereas apolar components as alkamides prevailed in root extracts. Data confirmed the potential of the three Echinacea species, mainly E. angustifolia, for the formulation of new formulates for a sustainable nematode management.

中文翻译：

---

紫锥菊对根结线虫Meloidogyne incognita的杀线活性

据报道，紫锥花物种具有大量的生物活性化合物，但其对植物寄生线虫的作用仍是未知的。这项研究比较地研究了化学特征的提取物，其化学性质为：从马鞭草， 淡色肠球菌和 紫叶肠球菌对根结线虫Meloidogyne incognita的幼鱼和卵。与土壤改良剂的Suppressiveness紫锥菊的植物生物量，还研究了对南方根结线虫在盆栽混合物的番茄。暴露于所有松果菊的500 µg mL ^-1溶液中48小时后，发生了超过50％的少年死亡率提取物，以及超过50％的隐孢子虫卵在暴露于相同浓度的E. angustifolia提取物1周后未孵化。在用所有松果菊生物量改良的土壤中，番茄根上的线虫繁殖总是显着减少的，而且几乎所有处理方法也导致番茄生长显着增加。松果菊提取物的主要成分是紫锥菊苷和癸酸等极性化合物，而根提取物中则以链烷酰胺等非极性成分为主。数据证实了三个潜在的紫锥花种，主要沙枣，用于制定可持续线虫管理的新配方。