Management of Phytophthora palmivora disease in Citrus reticulata with chemical fungicides

Minh, Nguyen; Thu, Phạm Quang; Nam, Hyegyeong; Quang, Dao-Ngoc; Phong, L. V.; Van, N. D.; Trang, Trần Thị Huyền; Kien, Tran Trung; Tam, T. T. T.; Dell, B.

doi:10.1007/s10327-020-00953-z

Cited by 9 publications

(7 citation statements)

References 28 publications

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“…palmivora (Chi et al, 2020) while potassium phosphite exhibited inhibitory activity against the mycelial growth of P. citrophthora (Ramallo et al, 2019). However, it is important to note that results from the in vitro test employed in this study may not accurately reflect the actual control efficacy of the fungicides in the field, thus necessitating additional field research on the management of citrus Phytophthora disease using these fungicides.…”

Section: Discussionmentioning

confidence: 93%

“…The susceptibility of the four Phytophthora species to common oomycota fungicides was also determined in this study, in which all the tested fungicides inhibited the growth of all Phytophthora species in vitro. Indeed, potassium phosphonate, metalaxyl‐M and mancozeb have been reported to inhibit the mycelial growth of P. palmivora (Chi et al, 2020) while potassium phosphite exhibited inhibitory activity against the mycelial growth of P. citrophthora (Ramallo et al, 2019). However, it is important to note that results from the in vitro test employed in this study may not accurately reflect the actual control efficacy of the fungicides in the field, thus necessitating additional field research on the management of citrus Phytophthora disease using these fungicides.…”

Section: Discussionmentioning

confidence: 99%

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Current status and characterization of Phytophthora species associated with gummosis of citrus in Northern Vietnam

Tran

Vvedensky

et al. 2023

Journal of Phytopathology

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Phytophthora species have long been reported to cause Phytophthora disease in citrus with symptoms of gummosis, root rot and fruit brown rot. Due to the lack of an up‐to‐date investigation of Phytophthora species currently causing the disease in Northern Vietnam, this study aimed to determine the current Phytophthora species associated with the disease in this region. An extensive collection of diseased samples was conducted in the main citrus‐growing areas in Northern Vietnam from 2021 to 2022. Fifty‐four Phytophthora isolates were obtained and initially divided into four groups based on morphological characteristics, including colony morphology, mycelial growth rate and reproductive structures. Representative Phytophthora isolates from each group were then identified as P. palmivora, P. nicotianae, P. citrophthora and P. mekongensis based on the phylogenetic analysis of ITS and cox1 gene sequences. Pathogenicity tests showed that these four Phytophthora species induce gummosis and brown rot on pomelo, orange and lime, with pomelo being the most susceptible, followed by orange and lime, respectively. Koch's postulates were confirmed. All the Phytophthora species were sensitive to various fungicides including mancozeb, metalaxyl, chlorothalonil, fosetyl aluminium, potassium phosphonate and dimethomorph, of which metalaxyl was the most potent inhibitor of colony growth. Our findings provide updated information on the current Phytophthora species associated with gummosis in citrus in Northern Vietnam, with P. mekongensis being recorded for the first time in this region. This will serve as a reference for Phytophthora studies on citrus in the future and for developing an integrated management strategy for Phytophthora disease.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Current status and characterization of Phytophthora species associated with gummosis of citrus in Northern Vietnam

Tran

Vvedensky

et al. 2023

Journal of Phytopathology

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“…Lysinibacillus sp. CD3-6 was found to be inefficient against most of the Fusarium strains, but the Brevibacillus strains did suppress the growth of all phytopathogenic fungi and the oomycete P. palmivora , one of the most detrimental plant pathogens in Vietnam [ 47 ]. B. porteri HB1.4B, Brevibacillus sp.…”

Section: Resultsmentioning

confidence: 99%

Novel Plant-Associated Brevibacillus and Lysinibacillus Genomospecies Harbor a Rich Biosynthetic Potential of Antimicrobial Compounds

et al. 2023

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We have previously reported the draft genome sequences of 59 endospore-forming Gram-positive bacterial strains isolated from Vietnamese crop plants due to their ability to suppress plant pathogens. Based on their draft genome sequence, eleven of them were assigned to the Brevibacillus and one to the Lysinibacillus genus. Further analysis including full genome sequencing revealed that several of these strains represent novel genomospecies. In vitro and in vivo assays demonstrated their ability to promote plant growth, as well as the strong biocontrol potential of Brevibacilli directed against phytopathogenic bacteria, fungi, and nematodes. Genome mining identified 157 natural product biosynthesis gene clusters (BGCs), including 36 novel BGCs not present in the MIBiG data bank. Our findings indicate that plant-associated Brevibacilli are a rich source of putative antimicrobial compounds and might serve as a valuable starting point for the development of novel biocontrol agents.

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“…The efficiency of fungicides must consider the season, frequency, application method, and potential for resistance to develop [45,50,52]. The preventive and curative field experiments on the 10-year-old trees were conducted from January to May 2023.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Fungicides as Protective and Curative Treatments against Canker Disease of Eucalyptus urograndis Caused by Chrysoporthe deuterocubensis in Malaysia

Ambrose,

Peter Remun,

Shamsul Kamar

et al. 2023

Forests

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Over the years, Eucalyptus plantations have rapidly expanded in Sarawak, Malaysia, accounting for 19% of the total forest plantation area. In a routine forest health surveillance conducted in 2022 at Sarawak, Malaysia, tree stands of Eucalyptus urograndis (Eucalyptus grandis × Eucalyptus urophylla hybrid) were detected with symptoms of stem canker disease caused by Chrysoporthe infection. Given the limited information on the chemical control of Chrysoporthe stem canker disease, there is a growing need to develop effective chemical control strategies to protect and cure Chrysoporthe infection on E. urograndis trees. Therefore, this study aimed to identify the causal pathogen of this stem canker disease in 7-year-old E. urograndis trees in Sarawak, Malaysia, and evaluate the efficacy of various fungicides as curative or protectant treatments on canker infection using artificial inoculation methods. Fungal isolates were first collected and subjected to molecular identification and pathogenicity analysis. Then, in vitro efficacy tests were evaluated using five licensed fungicides: thiram, prochloraz manganese chloride, copper hydroxide, dimethomorph, and mancozeb. Subsequently, the performance of these fungicides was assessed through preventive and curative field experiments on 10-year-old E. urograndis trees using the artificial inoculation technique. Based on the morphological and phylogenetic analysis of the ITS1/ITS4, β-tubulin 2 (BT2), and the combined ITS1/ITS4 and BT2 sequences extracted from 20 fungal isolates, Chrysoporthe deuterocubensis was identified as the causal pathogen of the canker disease, with isolate CHRY18 recording the highest virulence. The in vitro efficacy tests showed that prochloraz manganese chloride achieved 100% inhibition against C. deuterocubensis at 1.0 mg/mL. In the preventive experiment, thiram significantly inhibited C. deuterocubensis infection, yielding the shortest lesion length (19.40 mm) compared to the non-treated control (47.48 mm) at 20 weeks post-inoculation. In the curative experiment, a significant reduction of 54.7% in lesion length was observed in inoculated symptomatic trees after 20 weeks of post-fungicide treatment with copper hydroxide. In conclusion, this study demonstrated prochloraz manganese chloride, thiram, and copper hydroxide as effective chemical controls of C. deuterocubensis stem canker on E. urograndis.

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Management of Phytophthora palmivora disease in Citrus reticulata with chemical fungicides

Cited by 9 publications

References 28 publications

Current status and characterization of Phytophthora species associated with gummosis of citrus in Northern Vietnam

Current status and characterization of Phytophthora species associated with gummosis of citrus in Northern Vietnam

Novel Plant-Associated Brevibacillus and Lysinibacillus Genomospecies Harbor a Rich Biosynthetic Potential of Antimicrobial Compounds

Evaluation of Fungicides as Protective and Curative Treatments against Canker Disease of Eucalyptus urograndis Caused by Chrysoporthe deuterocubensis in Malaysia

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