In- vitro bio-efficacy of some selected fungal antagonists against guava wilt pathogen

Dwivedi, S.K.

doi:10.9790/3021-020512171223

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…A. niger has been found to be promising in inhibiting the guava wilt pathogen. The results are correlated with the previous studies, namely Dwivedi and Shukla (2002), Singh et al (2003), Dwivedi and Dwivedi (2012), Naz et al (2013), andMandal et al (2021). Sharma et al (2011) tested A. niger against Fusarium wilt of tomato under in vitro, the highest mycelial inhibition of 74% was recorded, followed by Trichoderma spp., Bacillus spp.…”

Section: Bio-e Cacy Test Of a Niger Strains Against Guava Wilt Pathogensupporting

confidence: 92%

Metabolomic profiling and its association with the bio-efficacy of Aspergillus niger strain against Fusarium wilt of guava

et al. 2023

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Bio-control agents are the best alternative to chemicals for the successful management of plant diseases. The fungus Aspergillus niger is known to produce diverse metabolites with antifungal activity, attracting researchers to exploit it as a bio-control agent for plant disease control. In the present study, 11 A. niger strains were isolated and screened for their antagonism against the guava wilt pathogen under in vitro and in planta conditions. Strains were identified morphologically and molecularly by sequencing the internal transcribed spacer (ITS), β-tubulin, and calmodulin genes. The strains were evaluated through dual culture, volatile, and non-volatile methods under an in vitro study. AN-11, AN-6, and AN-2 inhibited the test pathogen Fusarium oxysporum f. sp. psidii (FOP) at 67.16%, 64.01%, and 60.48%, respectively. An in planta study was conducted under greenhouse conditions with 6 months old air-layered guava plants (var. Allahabad Safeda) by pre- and post-inoculation of FOP. The AN-11 strain was found to be effective under both pre- and post-inoculation trials. Furthermore, gas chromatography–mass spectrometry (GC–MS) analysis was carried out to characterize the volatile compounds of the most potential strain, A. niger. The hexane soluble fraction showed the appearance of characteristic peaks of hexadecenoic acid methyl ester (4.41%), 10-octadecanoic acid methyl ester (3.79%), dodecane (3.21%), undecane (3.19%), gibepyrone A (0.15%), 3-methylundecane (0.36%), and citroflex A (0.38%). The ethyl acetate fraction of the bio-control fungi revealed the occurrence of major antifungal compounds, such as acetic acid ethyl ester (17.32%), benzopyron-4-ol (12.17%), 1,2,6-hexanetriol (7.16%), 2-propenoic acid ethanediyl ester (2.95%), 1-(3-ethyloxiranyl)-ethenone (0.98%), 6-acetyl-8-methoxy dimethyl chromene (0.96%), 4-hexyl-2,5-dihydro dioxo furan acetic acid (0.19%), and octadecanoic acid (1.11%). Furthermore, bio-control abilities could be due to hyper-parasitism, the production of secondary metabolites, and competition for sites and nutrients. Indeed, the results will enrich the existing knowledge of metabolomic information and support perspectives on the bio-control mechanism of A. niger.

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Section: Bio-e Cacy Test Of a Niger Strains Against Guava Wilt Pathogensupporting

confidence: 92%

Metabolomic profiling and its association with the bio-efficacy of Aspergillus niger strain against Fusarium wilt of guava

et al. 2023

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“…The growing tip of affected plants turns dark brown and the black, necrotic areas extend backward, causing dieback of plants. There is an appearance of small spots of the size of pin-head on fruit especially during monsoon [3,4]. Later several spots coalesce to form bigger lesions.…”

Section: Introductionmentioning

confidence: 99%

Integrated Control of Some Fungal Diseases Affecting Guava and Pomegranate from Farm to Fork in Egypt

Sharkawy Sahar S. A.,

Alkolaly,

Mikhail

2024

AJAHR

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These studies aim to identify a group of pathogens and design an integrated control program reducing the infection in Guava Psidium guajava and Pomegranate Punica granatum by cross inoculation method. Almost eight fungi were collected from governorate Ismaelia and Behera in 2019. Alternaria alternate, Fusarium spp, Phomopsis psidii, Macrophomina spp., Cercospora spp. Botrytis cineria and Pestalotia spp. were the most frequencies isolated fungi on all fruits. In the second season 2020 we treated trees with biocides, fungicides and fertilizer they gave significant differences between the treated treatments and control .The bluegreen algae bio treatment, showed the best results compared with both of RizoN and Plantagaurd treatments, the percentage of disease severity on the leaves was 13.4%, compared to the control45%, the best chemical treatment was Fungalpro, Topsin and Collise, where the disease severity was 0% in case of guava ,the same results obtained in pomegranate .At the end of the season, the best results were in the treatment with fungalpro which gave the least disease severity percentage on each of the leaves, branches and fruits in both guava and pomegranate .In the third season 2022 we applied integrated control program there were a significant decrease in pathogenic fungi in leaves, branches, flowers and ripe fruits, as the population at the end of the season for some fungi reached zero, such as Phomopsis sp. and Pestalotia sp. As Alternaria fungus, the results showed significant differences compared with the control, with regard to Guava, the percentage of disease severity in fruits was 8.75% and 9.75% in both Ismailia and South of Tahrir, respectively, compared to the control, which reached 85.5% and 88.5% in Ismailia and South of Tahrir, respectively. The results for pomegranate followed the same pattern.

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“…Several studies documented different diseases on guava trees e.g. ; damping off and blight of seedlings, anthracnose, stem canker, leaf spots and blight, smooty mold and rots of fruits [6,7,8]. Among these diseases, leaf spots were considered mainly fungal infections incited by Alternaria alternata [9], Alternaria tenuissima [10]; Cercospora psidii, and Cercospora sawadae [11] and Pestalotia psidii [4]; or algal infection incited by Cephaleuros virescens [12].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Scabdel and Golden Copper Fungicides on Phytopathogenic Fungi Isolated from Guava Leaves

Hussein,

Salah,

Marwan

et al. 2023

AJBGMB

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The objectives of the study identify the fungal species from guava leaves symptomatic with leaf spots. Six fungal species (Alternaria atra, Botryotrichium verrucosum, Cochliobolus specifer, Drechslera halodes, Humicola grisea and Stachybotrys chartarum) were isolated from infected guava leaves by the direct plate method on PDA medium at 28°C. Pathogenicity test illustrated that only two species were pathogenic to guava leaves, and B. verrucosum exhibited moderate virulent ability, but C. specifer was weakly virulent. Half of the fungal species were pathogenic to apple fruits indicating that the species were non-host-specific to the guava plant. Scabdel fungicide completely inhibited the growth of B. verrucosum at 50 ppm, but in the case of C. specifer the inhibition ranged 18.8-33.3% with dose increases. Golden Copper was stimulatory to the growth of tested fungi at 50 -1000 ppm doses.

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In- vitro bio-efficacy of some selected fungal antagonists against guava wilt pathogen

Cited by 7 publications

References 9 publications

Metabolomic profiling and its association with the bio-efficacy of Aspergillus niger strain against Fusarium wilt of guava

Metabolomic profiling and its association with the bio-efficacy of Aspergillus niger strain against Fusarium wilt of guava

Integrated Control of Some Fungal Diseases Affecting Guava and Pomegranate from Farm to Fork in Egypt

Efficacy of Scabdel and Golden Copper Fungicides on Phytopathogenic Fungi Isolated from Guava Leaves

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