In vitro evaluation of Different Fungicides against Alternaria alternata Causing Leaf and Fruit Spot in Pomegranate

Kadam, Vasudha A.; Dhutraj, DN; Pawar, D. V.

doi:10.20546/ijcmas.2018.710.265

Int.J.Curr.Microbiol.App.Sci

2018

DOI: 10.20546/ijcmas.2018.710.265

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In vitro evaluation of Different Fungicides against Alternaria alternata Causing Leaf and Fruit Spot in Pomegranate

Vasudha A. Kadam¹,

DN Dhutraj²,

D. V. Pawar³

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Evaluation and control ofAlternaria alternatacausing leaf spot in soybean in Northeast China

Huang

Zhou

et al. 2023

Journal of Applied Microbiology

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Aim The aims of this study were to characterize the causal agent of soybean leaf spot and determine the pathogenicity of the pathogen to the main crops in Northeast China and detect the sensitivity of pathogens to the main chemical fungicides and the potted control effect. Methods and results In 2020 and 2021, an uncommon leaf spot was observed in Harbin, Heilongjiang Province (125°42′-130°10′E, 44°04′-46°40′N), China. The pathogen can infect soybean leaves and cause leaf spot. We collected diseased soybean leaves and isolated four pathogen organisms, all of which were identified as Alternaria alternata through Morphological and Molecular Identification. Koch's postulates were used to confirm pathogenicity. To the best of our knowledge, this is the first report on soybean leaf spot disease caused by A. alternata in northeast China. Moreover, A. alternata had a broad host range and caused leaf spot in most legumes. However, it did not infect medicated lentil (Dolicho Lablab L.) or tobacco (Nicotiana tabacum L.). Assessment of A. alternaria susceptibility to fungicides by spore germination method, isolates of A. alternata were most sensitive to flusilazole, with EC50 values of 0.0040 - 0.0053 μg ml−1. Through two pot experiments, the average control efficacy of 0.1 mg ml−1 flusilazole on soybean leaf spot caused by A. alternata was 80.7%. Conclusions The work reported that A. alternata is the pathogen organism that causes soybean leaf spot in northern China. The pathogen organism can infect a variety of leguminous plants. Considering the control cost and effect, flusilazole is more suitable for controlling leaf spot disease in the field, and benzoxystrobin can be used as an alternative fungicide.

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Evaluation and control ofAlternaria alternatacausing leaf spot in soybean in Northeast China

Huang

Zhou

et al. 2023

Journal of Applied Microbiology

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Baseline Sensitivity and Toxicity Mechanisms of Prochloraz to Alternaria alternata Strains Associated with Maize Leaf Blight in Heilongjiang Province in China

Shen,

Teng,

Sun

et al. 2024

Plant Disease

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Alternaria species are fungal pathogens that can infect maize, causing leaf blight disease and significant economic losses. This study aimed to determine the baseline sensitivity to prochloraz of A. alternata isolates obtained from diseased maize leaves collected from Heilongjiang province by assessing the half-maximal effective concentration (EC50) values. The EC50 values of prochloraz ranged from 0.0550 µg/mL to 2.3258 µg/mL, with an average of 0.9995 ± 0.5192 µg/mL. At EC50 (1.2495 µg/mL) and 2EC50 (2.4990 µg/mL), prochloraz increased the number of mycelial offshoots, disrupted the cell membrane integrity of conidia and mycelia, and resulted in a reduced ergosterol content in the mycelia. Prochloraz significantly affected the mycelial cell membrane permeability and increased the malondialdehyde (MDA) content and superoxide dismutase (SOD) activity. No cross-resistance was detected between prochloraz and other fungicides. These data demonstrate that prochloraz is a promising fungicide for managing maize leaf blight caused by A. alternata and provide novel insights into understanding the mechanism of prochloraz toxicity against A. alternata isolates.

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In vitro evaluation of Different Fungicides against Alternaria alternata Causing Leaf and Fruit Spot in Pomegranate

Cited by 2 publications

References 1 publication

Evaluation and control ofAlternaria alternatacausing leaf spot in soybean in Northeast China

Evaluation and control ofAlternaria alternatacausing leaf spot in soybean in Northeast China

Baseline Sensitivity and Toxicity Mechanisms of Prochloraz to Alternaria alternata Strains Associated with Maize Leaf Blight in Heilongjiang Province in China

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