Uniform Root Layer Application at Optimal Timing Can Effectively Improve Root-Knot Nematode Disease Control in Rui Yam

Rong Zeng, Wensheng Fang, Xinshen Li, Shuijin Huang, Xi Wang, Qingyou Zhou, Qiuxia Wang, Aocheng Cao, Yang Sun () and Juling Hua
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Rong Zeng: Institute of Plant Protection, Jiangxi Academy of Agriculture Sciences, Nanchang 330200, China
Wensheng Fang: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Xinshen Li: Institute of Plant Protection, Jiangxi Academy of Agriculture Sciences, Nanchang 330200, China
Shuijin Huang: Institute of Plant Protection, Jiangxi Academy of Agriculture Sciences, Nanchang 330200, China
Xi Wang: Jiangxi Agricultural and Rural Industry Development Service Center, Nanchang 330096, China
Qingyou Zhou: Ruichang Agricultural and Rural Bureau, Ruichang 332200, China
Qiuxia Wang: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Aocheng Cao: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Yang Sun: Institute of Plant Protection, Jiangxi Academy of Agriculture Sciences, Nanchang 330200, China
Juling Hua: Institute of Plant Protection, Jiangxi Academy of Agriculture Sciences, Nanchang 330200, China

Agriculture, 2022, vol. 12, issue 12, 1-13

Abstract: Root-knot nematode disease seriously threatens the production of Rui yams, making it important to explore effective management strategies, including the optimal time for disease control and efficient application techniques. In this study, we monitored the dynamics of a root-knot nematode J2 population in the soil using field sampling; moreover, we investigated the dynamics of root-knot nematode disease using a field sampling and visual in situ device based on identifying species of root-knot nematodes in Rui yams. Additionally, experiments pertaining to optimal application time and techniques were conducted in Ruichang and Nanchang. This is the first study to propose that chemical control should be optimally timed, with one application administered at the time of yam seedling flush, and another given approximately 60 days later. Applications of a 41.7% fluopyram suspension (1426 g.a.i./hm 2 ) and a 30% fosthiazate microencapsulated suspension (2925 g.a.i./hm 2 ) achieved disease control effects of 81.56–83.15% and 75.95–78.42%, respectively. Additionally, the comparative analysis demonstrated that using uniform root layer application technology at the optimal time produces a control effect exceeding 80%, which is significantly higher than conventional techniques such as drip irrigation and root irrigation. These results provide theoretical and technical support for the efficient control of root-knot nematode disease in Rui yams.

Keywords: rui yam; root-knot nematode disease; occurrence pattern; chemical control; optimal period; application techniques (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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