First report of Paramyrothecium foliicola causing leaf spots on hop

Pereira, Caio Mattos; Barreto, Robert W.

doi:10.1007/s13314-023-00490-6

Australasian Plant Dis. Notes

2023

DOI: 10.1007/s13314-023-00490-6

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First report of Paramyrothecium foliicola causing leaf spots on hop

Caio Mattos Pereira

Robert W. Barreto

Abstract: Paramyrothecium foliicola is reported for the first time in Brazil and worldwide causing leaf spots on hop (Humulus lupulus). The fungus was identified with a combination of morphological and molecular information. The pathogenicity of P. foliicola to hop was demonstrated through inoculations under controlled conditions.

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Identification and Fungicide Control of Bipolaris sorokiniana Causing Leaf Spot and Blight on Common Hop (Humulus lupulus) in Korea

Liu

Park²,

Sang

2023

Plant Disease

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Hop (Humulus lupulus) is a perennial herbaceous vine belonging to the family Cannabeaceae. This crop is commercially grown for the brewing industry for its bitter and aromatic flavor, as well as its antiseptic properties. In June 2021, leaf spot and blight was observed on common hop plants in Buan-gun, Jeollabuk-do, South Korea. The typical symptoms were small to large, dark brown necrotic lesions with yellow halos on the leaves. This study aimed to clarify the causal agent of this disease. Two fungal species, Alternaria alternata and Bipolaris sorokiniana, were isolated from the diseased leaf samples and identified by combining morphological observations and phylogenetic analysis using sequence datasets of ITS, Alt a1, rpb2, endoPG, OPA10-2, and ITS, gpd, and tef1, respectively. Pathogenicity of the fungal isolates on detached leaves and living plants revealed that B. sorokiniana is the causal pathogen of this disease, while A. alternata is potentially a saprophyte. Fungicide sensitivity of the pathogen B. sorokiniana was further estimated in vitro using three classes of fungicides represented by fluxapyroxad, pyraclostrobin, and hexaconazole. The effective concentrations that inhibited 50% of spore germination (EC50) were 0.72 µg ml-1, 1.90 µg ml-1, and 0.68 µg ml-1, respectively. Moreover, all of these fungicides were able to control B. sorokiniana on detached common hop leaves at their recommended concentrations. In conclusion, this study reports leaf spot and blight of common hop caused by B. sorokiniana for the first time and proposes potential fungicides for this disease.

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Identification and Fungicide Control of Bipolaris sorokiniana Causing Leaf Spot and Blight on Common Hop (Humulus lupulus) in Korea

Liu

Park²,

Sang

2023

Plant Disease

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First report of Paramyrothecium foliicola causing leaf spots on hop

Cited by 1 publication

References 21 publications

Identification and Fungicide Control of Bipolaris sorokiniana Causing Leaf Spot and Blight on Common Hop (Humulus lupulus) in Korea

Identification and Fungicide Control of Bipolaris sorokiniana Causing Leaf Spot and Blight on Common Hop (Humulus lupulus) in Korea

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