Abstract Coffee crop is of high importance to the Brazilian agriculture, but plant-parasitic nematodes, especially the root-knot nematode Meloidogyne paranaensis, can reduce the productivities of coffee plants. The management of nematodes in coffee is done mainly with the use of resistant plants and chemical and biological nematicides, mainly in large-scale farms. Nevertheless, there is scarce information about the efficacy of available nematicides and new molecules in the control of root-knot nematodes in coffee. Thus, the objective of the present work was to evaluate the efficacy, under greenhouse conditions, of four chemical (cadusafos, carbofuran, fluopyram, and fluensulfone) and two biological (Purpureocillium lilacinum and Trichoderma harzianum) nematicides and one organo-mineral compost in the control of M. paranaensis, the main nematode species for Parana coffee production. For this, coffee plants of the cultivar Mundo Novo with four to five pairs of leaves were transplanted to 3.6 L-capacity plastic pots and inoculated with 1,000 eggs of M. paranaensis; noninoculated plants were used as control. Nematicide treatments at the recommended dosages by manufacturers were done soon after the transplant and inoculation or 60 days after. Evaluations were done 120 days after the inoculation on the basis of nematode reproduction factor (RF) and number of nematodes per gram of root (Nema/g). Additionally, the development of plants was measured by the variables plant height, fresh top weight, and fresh root weight. The results showed that the best nematicides to reduce nematode population were fluensulfone and fluopyram, with 99% and 100% reduction of the nematode RF, respectively. Carbofuran and cadusafos, although controlled the nematode, caused phytotoxicity to coffee plants. Biological nematicides were not effective in the reduction of the nematode population, but the application of P. lilacinum provided better development of plants. These results have high relevance, as they demonstrated the effect of chemical molecules and biological agents, both in M. paranaensis-infected plants and in noninfected plants; with this information, growers can choose products with a higher nematicidal effect and that allow better plant development for use in infested fields.

中文翻译：

---

化学和生物杀线虫剂对阿拉比卡咖啡中的根结线虫的防治效果

摘要 咖啡作物对巴西农业具有重要意义，但植物寄生线虫，特别是根结线虫类根结线虫会降低咖啡植物的产量。咖啡中线虫的管理主要通过使用抗性植物和化学和生物杀线虫剂来完成，主要是在大型农场。然而，关于可用的杀线虫剂和新分子在控制咖啡中的根结线虫方面的功效的信息很少。因此，本工作的目的是在温室条件下评估四种化学杀线剂（硫磷、克百威、氟吡菌酰胺和氟磺草醚）和两种生物杀线虫剂（紫丁香和哈茨木霉）以及一种有机矿物堆肥在温室条件下的功效。 M. paranaensis 的控制，巴拉那咖啡生产的主要线虫种类。为此，将具有 4 到 5 对叶子的栽培品种 Mundo Novo 的咖啡植株移植到 3.6 L 容量的塑料盆中，并接种 1,000 个 M. paranaensis 卵；未接种的植物用作对照。在移植和接种后不久或在 60 天后进行制造商推荐剂量的杀线虫剂处理。在接种后 120 天根据线虫繁殖因子 (RF) 和每克根的线虫数量 (Nema/g) 进行评估。此外，植物的发育是通过变量植物高度、鲜顶重和鲜根重来衡量的。结果表明，减少线虫数量的最佳杀线虫剂是氟虫砜和氟吡菌酰胺，线虫 RF 分别降低 99% 和 100%，分别。呋喃丹和硫线磷，虽然控制了线虫，但对咖啡植物造成了植物毒性。生物杀线虫剂对减少线虫数量无效，但应用淡紫色P. lilacinum 为植物提供了更好的发育。这些结果具有很高的相关性，因为它们证明了化学分子和生物制剂对 M. paranaensis 感染植物和未感染植物的影响；有了这些信息，种植者可以选择具有更高杀线虫效果的产品，并且可以使植物更好地发育以用于受侵染的田地。lilacinum 为植物提供了更好的发育。这些结果具有很高的相关性，因为它们证明了化学分子和生物制剂对 M. paranaensis 感染植物和未感染植物的影响；有了这些信息，种植者可以选择具有更高杀线虫效果的产品，并且可以使植物更好地发育以用于受侵染的田地。lilacinum 为植物提供了更好的发育。这些结果具有很高的相关性，因为它们证明了化学分子和生物制剂对 M. paranaensis 感染植物和未感染植物的影响；有了这些信息，种植者可以选择具有更高杀线虫效果的产品，并且可以使植物更好地发育以用于受侵染的田地。