Impact of Fungicide Timing on the Composition of the Fusarium Head Blight Disease Complex and the Presence of Deoxynivalenol (DON) in Wheat

Fusarium head blight (FHB) in wheat (Triticum aestivum L.) is caused by a consortium of mutually interacting Fusarium species. In the field, the weakly pathogenic F. poae often thrives on the infection sites of the virulent F. graminearum. In this ecological context, we investigated the efficacy of chemical and biocontrol agents against F. graminearum in wheat ears. For this purpose, one fungicide comprising prothioconazole + spiroxamine and two bacterial biocontrol strains, Streptomyces rimosus LMG 19352 and Rhodococcus sp. R-43120 were tested for their efficacy to reduce FHB symptoms and mycotoxin (deoxynivalenol, DON) production by F. graminearum in presence or absence of F. poae. Results showed that the fungicide and both actinobacterial strains reduced FHB symptoms and concomitant DON levels in wheat ears inoculated with F. graminearum. Where Streptomyces rimosus appeared to have direct antagonistic effects, Rhodococcus and the fungicide mediated suppression of F. graminearum was linked to the archetypal salicylic acid and jasmonic acid defense pathways that involve the activation of LOX1, LOX2 and ICS. Remarkably, this chemical- and biocontrol efficacy was significantly reduced when F. poae was co-inoculated with F. graminearum. This reduced efficacy was linked to a suppression of the plant’s intrinsic defense system and increased levels of DON. In conclusion, our study shows that control strategies against the virulent F. graminearum in the disease complex causing FHB are hampered by the presence of the weakly pathogenic F. poae. This study provides generic insights in the complexity of control strategies against plant diseases caused by multiple pathogens.

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Auxin as a player in the biocontrol of Fusarium head blight disease of barley and its potential as a disease control agent

BMC Plant Biology ◽

10.1186/1471-2229-12-224 ◽

2012 ◽

Vol 12 (1) ◽

pp. 224 ◽

Cited By ~ 50

Author(s):

Carloalberto Petti ◽

Kathrin Reiber ◽

Shahin S Ali ◽

Margaret Berney ◽

Fiona M Doohan

Keyword(s):

Disease Control ◽

Fusarium Head Blight ◽

Control Agent ◽

Head Blight ◽

Blight Disease

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Identification and Chemotype Profiling of Fusarium Head Blight Disease in Triticale

Research in Plant Disease ◽

10.5423/rpd.2021.27.4.172 ◽

2021 ◽

Vol 27 (4) ◽

pp. 172-179

Author(s):

Jung-Wook Yang ◽

Joo-Yeon Kim ◽

Mi-Rang Lee ◽

In-Jeong Kang ◽

Jung- Hyun Jeong ◽

...

Keyword(s):

Sequence Analysis ◽

Fusarium Head Blight ◽

Gene Sequence ◽

Disease Incidence ◽

Head Blight ◽

Resistance Response ◽

Fusarium Asiaticum ◽

Gene Sequence Analysis ◽

The Media ◽

Blight Disease

This study aimed to assess the disease incidence and distribution of toxigenic in Korean triticale. The pathogen of triticale that cause Fusarium head blight were isolated from five different triticale cultivars that cultivated in Suwon Korea at 2021 year. The 72 candidate were classified as a Fusarium asiaticum by morphology analysis and by ITS1, TEF-1α gene sequence analysis. And the results of pathogenicity with 72 isolates on seedling triticale, 71 isolates were showed disease symptom. Also, seven out of 71 Fusarium isolates were inoculated on the wheat, to test the pathogenicity on the different host. The results showed more low pathogenicity on the wheat than triticale. The results of analysis of toxin type with 72 isolates, 64.6% isolates were produced nivalenol type toxin and other 4.6% and 30.8% isolates were produce 3-acetyldeoxynivalenol and 15-acetyldeoxynivalenol, respectively. To select fungicide for control, the 72 Fusarium isolates were cultivated on the media that containing four kinds fungicide. The captan, hexaconazole, and difenoconazole·propiconazole treated Fusarium isolates were not showed resistance response against each fungicide. However, six isolates out of 72 isolates, showed resistance response to fludioxonil. This study is first report that F. asiaticum causes Fusarium head blight disease of triticale in Korea.

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