Grabau Zane J, Budhathoki Sabina, Ruiz Rebeca Sandoval, Liu Chang
Entomology and Nematology Department, Institute of Food and Agricultural Sciences, University of Florida Institute, 1881 Natural Area Drive, Gainesville, FL 32611, United States.
Laboratory of Nematology, Crop Protection Research Center, Agronomy School, University of Costa Rica, San José, Costa Rica 2060.
J Nematol. 2025 Apr 22;57(1):20250010. doi: 10.2478/jofnem-2025-0010. eCollection 2025 Feb.
(peanut root-knot nematode, PRKN) is an important pest in peanut () production in the United States, including specialty Virginia-type peanuts. Cultivars resistant to PRKN and nematicide application are two available methods for managing PRKN. The objectives of this study were to determine the impacts of resistant Virginia-type peanut cultivars (Georgia-19HP and TifJumbo) on (1) management of PRKN abundances and damage and (2) total free-living nematode soil abundances. A common susceptible cultivar (Bailey II) with or without in-furrow fluopyram nematicide was compared to the resistant cultivars without nematicide in field trials in Florida (2022 and 2023). Resistant cultivars reduced midseason PRKN abundances from roots by 92-98% and final PRKN soil abundances by 81-93% relative to the untreated susceptible cultivar. Fluopyram reduced midseason PRKN root abundances by 65-74% and final PRKN soil abundances by 42-51% relative to untreated susceptible. Although PRKN reproduced on peanuts, no damage symptoms were observed, yield did not vary by treatment in 2022, and yield was significantly greater for fluopyram than either resistant cultivar in 2023. Impacts on total free-living nematode soil abundances were inconsistent. In summary, either fluopyram or resistant cultivars are effective tools for managing PRKN abundances in Virginia-type peanuts.
花生根结线虫（PRKN）是美国花生生产中的一种重要害虫，包括弗吉尼亚型特色花生。抗PRKN品种和施用杀线虫剂是管理PRKN的两种可用方法。本研究的目的是确定抗性弗吉尼亚型花生品种（Georgia-19HP和TifJumbo）对（1）PRKN数量和危害的管理以及（2）土壤中自由生活线虫总数的影响。在佛罗里达州的田间试验（2022年和2023年）中，将一种常见的感病品种（Bailey II），有或没有沟施氟吡菌酰胺杀线虫剂，与不使用杀线虫剂的抗性品种进行比较。相对于未处理的感病品种，抗性品种使季中根部PRKN数量减少了92%-98%，最终土壤中PRKN数量减少了81%-93%。相对于未处理的感病品种，氟吡菌酰胺使季中根部PRKN数量减少了65%-74%，最终土壤中PRKN数量减少了42%-51%。虽然PRKN在花生上繁殖，但未观察到损害症状，2022年产量不受处理影响，2023年氟吡菌酰胺处理的产量显著高于任何一个抗性品种。对土壤中自由生活线虫总数的影响并不一致。总之，氟吡菌酰胺或抗性品种都是管理弗吉尼亚型花生中PRKN数量的有效工具。
