Crops ›› 2026, Vol. 42 ›› Issue (1): 266-270.doi: 10.16035/j.issn.1001-7283.2026.01.033

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Risk Assessment of Corn Pathogens Causing Root Rot in Soybean

Zheng Xiaojuan(), Sun Hua, Guo Ning, Liu Shusen, Zhang Haijian, Ma Hongxia, Shi Jie()   

  1. Plant Protection Institute, Hebei Academy of Agricultural and Forestry Sciences / Key Laboratory of Integrated Pest Management on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs / Hebei Provincial Agricultural Pest Integrated Control Technology Innovation Center / Hebei International Joint Research Center for Integrated Control of Crop Pests and Diseases, Baoding 071000, Hebei, China
  • Received:2024-07-26 Revised:2024-10-10 Online:2026-02-15 Published:2026-02-10

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Abstract:

In order to clarify the pathogenicity and the potential risk of major corn pathogens to soybean root rot in corn-soybean inter planting, this study artificially inoculated non-co-occurring pathogens onto soybean roots and observed the symptoms in pots, and identified the infection grades of pathogens on soybean root rot. The results showed that Curvularia lunata causing corn curvularia leaf spot, Bipolaris maydis causing southern corn leaf blight, and Exserohilum turcicum causing northern corn leaf blight were non-co-occurring pathogens and could cause soybean root rot. Isolation and identification confirmed that the isolated strains were identical to the inoculated pathogens; C.lunata could cause soybean root rot up to Grade 5, B.maydis and E.turcicum could lead to soybean root rot up to Grade 3. The above results indicated that all three pathogens were causal agents of soybean root rot, and there was a potential risk of causing soybean root rot.

Key words: Soybean, Corn pathogens, Pathogenicity, Root rot

Fig.1

Infection of C.lunata on soybean root (a): overall; (b)-(d): root; (e): root constriction; (f): root cross-section; (g): colony; (h): spore (40×)."

Fig.2

Infection of B.maydis on soybean root (a)-(d): root; (e): root cross-section; (f): root detail; (g): colony; (h): spore (40×)."

Fig.3

Infection of E.turcicum on soybean root (a)-(c): root; (d)-(e): root infection severity; (f): root cross-section; (g): colony; (h): spore (40×)."

Fig.4

Comparison of between non-inoculated soybean and inoculation soybean roots (a)-(b): soybean root comparison; c: root cross-section."

Fig.5

Comparison of control plants and infected plants CK: control plant; (a) C.lunata root rot plant; (b) B.maydis root rot plant; (c) E.turcicum root rot plant."

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