<i>Mycosphaerella ribis</i>leaf spot on black currants in New Zealand: Perithecial maturation, ascospore release, and symptom development

Mulholland, R. I.; Beresford, R.

doi:10.1080/01140671.1989.10428026

New Zealand Journal of Crop and Horticultural Science

1989

DOI: 10.1080/01140671.1989.10428026

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Mycosphaerella ribisleaf spot on black currants in New Zealand: Perithecial maturation, ascospore release, and symptom development

R. I. Mulholland

R. Beresford

Abstract: Maturation of perithecia of

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Identification, characterization and chemical management ofAlternaria alternatacausing blackcurrant leaf spot in China

Zhang

Zhou

et al. 2023

Journal of Applied Microbiology

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Aim The aims of this study were to identify the pathogen causing blackcurrant leaf spot, assess the pathogenicity of different isolates, the host range, and the sensitivity to common fungicides, and test the effectiveness of field control for controlling A. alternata in blackcurrants in China, and potentially elsewhere. Methods and results In 2020 and 2021, an uncommon leaf spot on blackcurrants was observed in Harbin (125°42′-130°10′E, 44°04′-46°40′N), Heilongjiang Province, China. Based on morphological, molecular characteristics and phylogenetic analyses, 10 fungal isolates, identified as Alternaria alternata, were obtained from infected blackcurrant leaves of 10 infected plants in this study. To our knowledge, this is the first description of A. alternata as a causal agent of leaf spot on blackcurrants in China. A. alternata has a wide host range and infects eight of 10 crop and ornamental plants evaluated, namely Sorbus pohuashanensis, Malus pumila, Rosa davurica, Padus racemosa, Hippophae rhamnoides, Crataegus pinnatifida, Pyrus ussuriensis, and Sambucus williamsii, but not Viburnum trilobum and Prunus tomentosa. Moreover, ten blackcurrant cultivars were screened and found to have contrasting levels of resistance to A. alternata. One was moderately resistant, four were resistant, four were susceptible, and one was highly susceptible. A. alternata isolate was most sensitive to propiconazole-azoxystrobin, with EC50 values of 0.0038 μg ml−1 and efficacy ranging between 83.34% and 84.13% at 317 μg ml−1 in the field. Conclusions The work reported that A. alternata is the pathogen that causes blackcurrant leaf spot in northern China. It can infect a variety of crop and ornamental plants. Considering the control cost and effect, propiconazole-azoxystrobin is more suitable for controlling leaf spot in the field.

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Identification, characterization and chemical management ofAlternaria alternatacausing blackcurrant leaf spot in China

Zhang

Zhou

et al. 2023

Journal of Applied Microbiology

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Disease Control on Currants

Parikka¹,

Aaltonen²,

Hakolahti³

2008

Acta Hortic.

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Mycosphaerella ribisleaf spot on black currants in New Zealand: Perithecial maturation, ascospore release, and symptom development

Abstract: Maturation of perithecia of

Cited by 2 publications

References 4 publications

Identification, characterization and chemical management ofAlternaria alternatacausing blackcurrant leaf spot in China

Identification, characterization and chemical management ofAlternaria alternatacausing blackcurrant leaf spot in China

Disease Control on Currants

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