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Occurrence of Leaf Spot Caused by Alternaria tenuissima on Aloe barbadensis in Greece.

PLANT DISEASE (2016)

Journal

PLANT DISEASE

Volume 100, Issue 5, Pages 1015-1015

Publisher

AMER PHYTOPATHOLOGICAL SOC

DOI: 10.1094/PDIS-07-15-0803-PDN

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First record of Alternaria tenuissima causing Aloe barbadensis leaf blight and leaf spot disease in Beijing, China

Tanvir Ahmad, Chengrong Nie, Changyu Cao, Ying Xiao, Xi Yu, Yang Liu

Summary: In 2020, Alternaria leaf blight and spot disease caused by Alternaria tenuissima was first observed on Aloe barbadensis in Beijing, China. This research is important for studying the medicinal plant Aloe barbadensis globally.

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Luobuma Leaf Spot Disease Caused by Alternaria tenuissima in China

Yanru Lan, Zhichen Yan, Tingyu Duan, Katrina Maria Ramonell

Summary: This study identified Alternaria tenuissima as the fungal species causing Luobuma leaf spot disease and evaluated the effectiveness of fungicides. The findings showed that hymexazol fungicide can be used to control the disease.

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Isolation and identification of Tussilago farfara leaf spot caused by Alternaria alternata in China

Yidan Wang, Chengde Yang, Mengjun Jin, Jianxin Zhong, Dahai Mei, Xingyin Wei, Hongfulianhua Wang

Summary: This study reports for the first time that Alternaria alternata is the causative agent of leaf spot disease on Tussilago farfara in China. The pathogen was identified based on its morphological and molecular characteristics, and the optimal conditions for its growth and sporulation were determined.

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Occurrence of Alternaria arborescens causing leaf spot on Pereskia aculeata in Brazil

M. H. Hahn, A. Claus, G. Koch, J. Gelain, H. S. S. Duarte

Summary: This study reported the discovery of Alternaria arborescens as the causal agent of leaf lesions in Pereskia aculeata in Curitiba, Brazil, marking the first global report of this pathogen infecting P. aculeata. The pathogen induced symptoms in plants, with all symptomatic leaves falling off 10 days post-inoculation, highlighting the importance for further research and conservation efforts for this plant species.

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Impact of weather parameters on Alternaria leaf spot of soybean incited by Alternaria alternata

R. K. Fagodiya, Amit Trivedi, B. L. Fagodia

Summary: Weather attributes play a crucial role in the infection process and spread of Alternaria leaf spot, a destructive disease of soybean. Early sowing predisposes soybean plants to the disease, and therefore it is recommended for farmers to delay sowing to reduce disease occurrence.

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Alternaria leaf spot of broccoli caused by Alternaria alternata in Bangladesh

Sayma T. Nira, Md Farhad Hossain, Nur Uddin Mahmud, Oliul Hassan, Md Tofazzal Islam, Abdul M. Akanda

Summary: The aim of this study was to isolate and characterize the pathogen responsible for Alternaria leaf spot on broccoli and evaluate the effectiveness of fungicides against it. The pathogen was identified as Alternaria alternata based on morphological and molecular analysis. The conidia of the isolates had distinct characteristics, and the maximum growth of the pathogen was observed at 30 degrees C and pH 6.0. Tilt 250 WC showed the highest inhibitory potential against the mycelial growth of A. alternata at a low concentration.

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Leaf spot of Lonicera japonica Thunb. (honeysuckle) caused by Alternaria alternata newly reported in China

Pengjie He, Xiyan Luo, Xiaoyun Wu, Wenyan Cui

Summary: Lonicera japonica Thunb. (honeysuckle) is a medicinal herb widely cultivated in China. It has been affected by a leaf spot disease in Suiyang, Guizhou, China. The disease is caused by the fungus Alternaria alternata, which leads to necrotic spots and wilting on the leaves. This study provides important insights into the understanding and control measures of honeysuckle leaf spot in China.

CROP PROTECTION (2023)

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Antifungal potential of zinc against leaf spot disease in chili pepper caused by Alternaria alternata

Amna Shoaib, Mishaal Akhtar, Arshad Javaid, Haider Ali, Zahra Nisar, Shabnam Javed

Summary: The study investigated the effects of ZnSO4 on Alternaria alternata in vitro and the impact of foliar application of ZnSO4 on chili pepper plants under disease stress. Results showed that Zn inhibited fungal growth, improved plant resistance, and effectively managed disease. Foliar Zn application enhanced antioxidant activities and defense compounds in plants, reducing disease incidence by 77%. This research suggests foliar ZnSO4 as an effective and sustainable agricultural practice for managing Alternaria leaf spot disease in chili pepper plants.

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Occurrence of leaf spot caused by Colletotrichum plurivorum on cowpea in Fujian Province, China

Yuli Dai, Lin Gan, Xiaofei Liu, Chengzhong Lan, Zhiqiang Li, Xiujuan Yang

Summary: This study reports the occurrence of leaf spot disease caused by Colletotrichum plurivorum on cowpea plants in Pingnan prefecture, Fujian Province, China. The pathogen was identified based on morphological features and gene sequencing. Pathogenicity tests confirmed that the isolates of C. plurivorum could infect healthy cowpea leaves and induce leaf spot symptoms.

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Olive leaf spot caused by Venturia oleaginea: An updated review

Roberto Buonaurio, Leen Almadi, Franco Famiani, Chiaraluce Moretti, Giovanni Enrico Agosteo, Leonardo Schena

Summary: Olive leaf spot (OLS) caused by Venturia oleaginea is a prevalent disease in olive-growing areas worldwide, leading to significant yield losses. Early detection of leaf symptoms is difficult, and the pathogen-induced leaf drop creates the illusion of healthy and restored plants. This review provides updated information on taxonomy, pathogen life cycle, epidemiology, diagnosis, and control strategies for OLS. Copper-based fungicides, the main method of control, are facing potential substitution due to regulations, making it urgent to find alternative strategies, especially for organic agriculture.

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Comparative transcriptome and metabolome analyses of cherry leaves spot disease caused by Alternaria alternata

Liu-Yi Pan, Jing Zhou, Yan Sun, Bai-Xue Qiao, Tian Wan, Rui-Quan Guo, Juan Zhang, Dong-Qian Shan, Yu-Liang Cai

Summary: A combined physiological, transcriptomic, and metabolomic approach was used to investigate the molecular mechanisms underlying sweet cherry's resistance to the necrotrophic fungal pathogen, Alternaria alternata. The study found that A. alternata infection induced the outbreak of reactive oxygen species (ROS) in cherry and observed earlier responses of antioxidant enzymes and chitinase in the resistant cultivar compared to the susceptible cultivar. The resistant cultivar exhibited stronger cell wall defense ability and differential genes and metabolites were enriched in various defense pathways. Reprogramming of the phenylpropanoid pathway and the alpha-linolenic acid metabolic pathway enhanced antifungal and ROS scavenging activity in the resistant cultivar.

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Enhancement of Melanogenic Inhibitory Effects of the Leaf Skin Extracts of Aloe barbadensis Miller by the Fermentation Process

Gibeom Jeon, Hyang-Sun Ro, Gyu-Rae Kim, Hyeon-Yong Lee

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Subcutaneous phaeohyphomycosis caused by Alternaria section Alternaria

Xiujiao Xia, Zehu Liu, Hong Shen

Summary: A woman with nephrotic syndrome developed purulent infiltrating plaques on her hands and arms, and was diagnosed with subcutaneous phaeohyphomycosis caused by Alternaria section Alternaria. Antifungal treatment led to complete resolution of the lesions after 2 months. The case report emphasizes the difficulty in distinguishing subcutaneous phaeohyphomycosis from chromoblastomycosis based solely on pathological findings and highlights the variation of parasitic forms of dematiaceous fungi in immunosuppressed hosts with different sites and environments.

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A New Leaf Blight Disease Caused by Alternaria jacinthicola on Banana in China

Bin Wang, Yongyan Zhang, Jiapeng Liu, Ou Sheng, Fan Liu, Dongliang Qiu, Peitao Lue, Guiming Deng, Chunzhen Cheng

Summary: A leaf blight disease caused by Alternaria jacinthicola was found on Robusta bananas in Guangdong province, China in September 2020. This disease leads to severe leaf necrosis and economic losses in banana production.

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Effect of two protein elicitors extracted from Alternaria tenuissima and Beauveria bassiana rice leaf folder

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Occurrence of Leaf Spot Caused by Alternaria tenuissima on Aloe barbadensis in Greece.

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