Multi-cropping of vegetables on the same plastic mulch builds up the population of root-knot nematodes (RKN; Meloidogyne spp.), which can severely reduce crop growth and yield. Vegetable growers in the southeastern US usually fumigate soil while laying the plastic mulch in the spring. They then apply non-fumigant nematicides via drip irrigation systems for subsequent crops grown on the mulch. With the advent of new and emerging nematicides, this research was aimed to investigate the best chemical control practice for M. incognita in a pepper and squash plasticulture system. Field trials were conducted in the spring (pepper) and summer (squash) of 2019 and 2020. The spring treatments were soil fumigants of 1,3-dichloropropene, allyl isothiocyanate, and 1,3-dichloropropene plus chloropicrin (Pic60), a RKN-resistant cultivar (Carolina Wonder), and an untreated check. Summer treatments were the non-fumigant nematicides fluopyram, fluensulfone, fluazaindolizine, oxamyl, and Burkholderia spp. strain A396. All spring treatments, except allyl isothiocyanate, reduced (P < 0.05) root galling compared to the untreated check at pepper harvest. At the end of the season, the population density of M. incognita in the soil was only lower (P < 0.05) for the RKN-resistant cultivar treatment than that of the untreated check. Though the RKN-resistant cultivar treatment had the lowest (P < 0.05) soil RKN population and significantly reduced root galling, it had the lowest pepper fruit yield. In contrast, pepper associated with Pic60 treatment had the highest fruit yield. For the summer trial, squash plots treated with fluensulfone had the lowest root gall index and oxamyl had the highest (P < 0.05); however, no difference was observed between fluensulfone and oxamyl with other treatments. In 2019, plots treated with Burkholderia spp. and fluensulfone had higher fruit yield (P < 0.05) than fluazaindolizine; however, squash yield was similar among the treatments in 2020. This study suggests that Pic60 (a mix of nematicide and fungicide active ingredients) is likely an ideal fumigant to apply when laying the plastic mulch because of its broad-spectrum effect, and any of the non-fumigant nematicides may be used in RKN control on squash.

的蔬菜复种在同一塑料地膜积聚根结线虫的人口（RKN;根结线虫属。），它会严重降低农作物的生长和产量。美国东南部的蔬菜种植者通常在春季铺设塑料覆盖物的同时熏蒸土壤。然后，他们通过滴灌系统为在覆盖物上生长的后续作物施用非熏蒸杀线虫剂。随着新的和新兴的杀线虫剂的出现，本研究旨在调查南方根结线虫的最佳化学控制实践在胡椒和南瓜塑性培养系统中。田间试验分别在 2019 年和 2020 年春季（辣椒）和夏季（南瓜）进行。春季处理是土壤熏蒸剂 1,3-二氯丙烯、异硫氰酸烯丙酯和 1,3-二氯丙烯加氯化苦 (Pic60)，一种 RKN抗性品种（Carolina Wonder）和未经处理的检查。夏季处理是非熏蒸杀线虫剂氟吡菌酰胺、氟虫砜、氟氮杂茚茚、草酰菌胺和伯克霍尔德菌属。菌株 A396。除异硫氰酸烯丙酯外，所有春季处理 与辣椒收获时未处理的对照相比均减少了（P < 0.05）根磨损。季节结束时，土壤中南方红豆杉的种群密度仅较低（P < 0.05) RKN 抗性栽培品种处理比未处理对照。尽管抗 RKN 品种处理的 土壤 RKN 种群最低（P < 0.05）并且显着减少了根磨损，但它的辣椒果实产量最低。相比之下，与 Pic60 处理相关的辣椒的果实产量最高。夏季试验中，用氟磺隆处理的南瓜地块根瘿指数最低，草胺指数最高（P  < 0.05）；然而，在其他处理中，在氟砜和草酰之间没有观察到差异。2019 年，用伯克霍尔德氏菌处理的地块。和氟砜的果实产量较高（P < 0.05) 比氟氮茚茚；然而，2020 年处理的南瓜产量相似。这项研究表明，Pic60（杀线虫剂和杀真菌剂活性成分的混合物）可能是铺设塑料覆盖物时应用的理想熏蒸剂，因为它具有广谱效应，并且非熏蒸杀线虫剂可用于南瓜的 RKN 控制。