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Alternaria helianthi (leaf blight of sunflower )
Alternaria helianthi
leaf blight of sunflower
Alternariaster helianthi,Helminthosporium helianthi
Worldwide
Widespread
2024-06-08
fungus
Korea
sunflower
ALTEHE
The fungus is most common in tropical and warm temperate regions and seems to be most damaging where high humidity is combined with high temperatures in the summer period (CABI). Korea lists this pathogen as Alternaria spp. This pathogen has been reported in Korea (Farr and Rossman, 2020)
1 Known Hosts
Helianthus annuus
sunflower
uncertain
ALTEHE-3,ALTEHE-4,ALTEHE-5,ALTEHE-6
Pathway not proven. Although references indicating seed may be a pathway (Jeffrey, et.al., 1985; Sackston, 1981; Shane, et.al., 1981), there is no evidence of seed transmission from natural sources in the field. Seed to seedling transmission has been demonstrated in the laboratory (Jeffrey, et.al., 1985; Raut, 1985; Shane, et.al., 1981). Seed inoculum may affect seed quality.
Yes
Culture plating
This method has not been standardized or validated and was used in research only.
ALTEHE-1,ALTEHE-4
Seed treatments.
Captan, chlorothalonil, iprodione, mancozeb or triadimenol all improved seedling stands in laboratory trials.
ALTEHE-4
ALTEHE-3
Sackston, WE. 1981. The Sunflower Crop and Disease: Progress, Problems and Prospects. Plant Disease 65: 643-648
ALTEHE-4
Jeffrey KK, Lipps PE and Herr LJ, 1984. Effects of isolate virulence, plant age, and crop residues on seedling blight of sunflower caused by Alternaria helianthi. Phytopathology, 74:1107-1110
ALTEHE-5
Raut JG. 1985. Location of Alternaria helianthi in sunflower seed and its transmission from seed to plant. Indian Phytopathology, 38:522
ALTEHE-6
Shane WW, Baumer JS and Sederstrom SG. 1981. Alternaria helianthi: Apathogen of sunflower new to Minnesota. Plant Disease 65:269-271
ALTEHE-1
Alternaria helianthi. In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
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