Occurrence and characterization of fungi and oomycetes transmitted via potting mixtures and organic manures

A. M. Al-Sadi; Fahad Al Said; A. H. Al-Jabri; Issa Al-Mahmooli; A. H. Al-Hinai; A. W A M de Cock

doi:10.1016/j.cropro.2010.09.015

Occurrence and characterization of fungi and oomycetes transmitted via potting mixtures and organic manures

A. M. Al-Sadi^*, Fahad Al Said, A. H. Al-Jabri, Issa Al-Mahmooli, A. H. Al-Hinai, A. W A M de Cock

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

A study was conducted to investigate the most common fungal and oomycete pathogens introduced into farms in Oman via potting mixtures and organic manures. A total of 37 commercial types of potting mixtures (2 local and 35 imported from overseas), 4 commercial types of organic manures and 11 non-commercial types of organic manures were included in the study. Identification of the isolated species was based on morphological characteristics, except for the most common species which were further identified using sequences of the internal transcribed spacer region of the ribosomal DNA (ITS rDNA). Fusarium spp. (14%), Pythium aphanidermatum (3%), Alternaria spp. (5%), Helminthosporium spp. (5%) and Cladosporium spp. (3%) were recovered at different frequencies from samples of potting mixtures. Fusarium solani (40%) and Fusarium equiseti (47%) were recovered at high frequencies from samples of organic manures. Isolations from organic manures also yielded Pythium periplocum (7%), Rhizoctonia solani (7%), Fusarium lichenicola (7%), Helminthosporium spp. (27%) and Alternaria spp. (27%). Trichoderma spp., Penicillium spp., Aspergillus spp. and Rhizopus spp. were found to be common in samples of potting mixtures and organic manures. Investigating sensitivity to hymexazol among 9 isolates of F. equiseti and 13 isolates of F. solani revealed variations among different isolates. The EC₅₀ values ranged from 1 to over 1200 (avg. 192 μg ml^-1) for F. equiseti isolates and from 135 to 789 (avg. 324 μg ml^-1) for F. solani isolates, indicating presence of resistance to this important fungicide among some Fusarium isolates. This appears to be the first report of contamination with R. solani, P. periplocum, F. solani, F. equiseti and F. lichenicola of organic manures. This study appears to report for the first time F. lichenicola in Oman and appears to be the first report of occurrence of resistance to hymexazol among F. equiseti and F. solani isolates.

Original language	English
Pages (from-to)	38-44
Number of pages	7
Journal	Crop Protection
Volume	30
Issue number	1
DOIs	https://doi.org/10.1016/j.cropro.2010.09.015
Publication status	Published - Jan 2011

Keywords

Fertilizer
Fusarium
ITS region
Pythium
Tachigaren

ASJC Scopus subject areas

Agronomy and Crop Science

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.cropro.2010.09.015

Cite this

@article{d8311d1b078c41c094cac0170eb720a3,

title = "Occurrence and characterization of fungi and oomycetes transmitted via potting mixtures and organic manures",

abstract = "A study was conducted to investigate the most common fungal and oomycete pathogens introduced into farms in Oman via potting mixtures and organic manures. A total of 37 commercial types of potting mixtures (2 local and 35 imported from overseas), 4 commercial types of organic manures and 11 non-commercial types of organic manures were included in the study. Identification of the isolated species was based on morphological characteristics, except for the most common species which were further identified using sequences of the internal transcribed spacer region of the ribosomal DNA (ITS rDNA). Fusarium spp. (14%), Pythium aphanidermatum (3%), Alternaria spp. (5%), Helminthosporium spp. (5%) and Cladosporium spp. (3%) were recovered at different frequencies from samples of potting mixtures. Fusarium solani (40%) and Fusarium equiseti (47%) were recovered at high frequencies from samples of organic manures. Isolations from organic manures also yielded Pythium periplocum (7%), Rhizoctonia solani (7%), Fusarium lichenicola (7%), Helminthosporium spp. (27%) and Alternaria spp. (27%). Trichoderma spp., Penicillium spp., Aspergillus spp. and Rhizopus spp. were found to be common in samples of potting mixtures and organic manures. Investigating sensitivity to hymexazol among 9 isolates of F. equiseti and 13 isolates of F. solani revealed variations among different isolates. The EC50 values ranged from 1 to over 1200 (avg. 192 μg ml-1) for F. equiseti isolates and from 135 to 789 (avg. 324 μg ml-1) for F. solani isolates, indicating presence of resistance to this important fungicide among some Fusarium isolates. This appears to be the first report of contamination with R. solani, P. periplocum, F. solani, F. equiseti and F. lichenicola of organic manures. This study appears to report for the first time F. lichenicola in Oman and appears to be the first report of occurrence of resistance to hymexazol among F. equiseti and F. solani isolates.",

keywords = "Fertilizer, Fusarium, ITS region, Pythium, Tachigaren",

author = "Al-Sadi, {A. M.} and {Al Said}, Fahad and Al-Jabri, {A. H.} and Issa Al-Mahmooli and Al-Hinai, {A. H.} and {de Cock}, {A. W A M}",

note = "Funding Information: The authors are grateful to SQU for financial support through the projects SR/AGR/CROP/10/01 and IG/AGR/CROP/09/01.",

year = "2011",

month = jan,

doi = "10.1016/j.cropro.2010.09.015",

language = "English",

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AU - Al-Sadi, A. M.

AU - Al Said, Fahad

AU - Al-Jabri, A. H.

AU - Al-Mahmooli, Issa

AU - Al-Hinai, A. H.

AU - de Cock, A. W A M

N1 - Funding Information: The authors are grateful to SQU for financial support through the projects SR/AGR/CROP/10/01 and IG/AGR/CROP/09/01.

PY - 2011/1

Y1 - 2011/1

N2 - A study was conducted to investigate the most common fungal and oomycete pathogens introduced into farms in Oman via potting mixtures and organic manures. A total of 37 commercial types of potting mixtures (2 local and 35 imported from overseas), 4 commercial types of organic manures and 11 non-commercial types of organic manures were included in the study. Identification of the isolated species was based on morphological characteristics, except for the most common species which were further identified using sequences of the internal transcribed spacer region of the ribosomal DNA (ITS rDNA). Fusarium spp. (14%), Pythium aphanidermatum (3%), Alternaria spp. (5%), Helminthosporium spp. (5%) and Cladosporium spp. (3%) were recovered at different frequencies from samples of potting mixtures. Fusarium solani (40%) and Fusarium equiseti (47%) were recovered at high frequencies from samples of organic manures. Isolations from organic manures also yielded Pythium periplocum (7%), Rhizoctonia solani (7%), Fusarium lichenicola (7%), Helminthosporium spp. (27%) and Alternaria spp. (27%). Trichoderma spp., Penicillium spp., Aspergillus spp. and Rhizopus spp. were found to be common in samples of potting mixtures and organic manures. Investigating sensitivity to hymexazol among 9 isolates of F. equiseti and 13 isolates of F. solani revealed variations among different isolates. The EC50 values ranged from 1 to over 1200 (avg. 192 μg ml-1) for F. equiseti isolates and from 135 to 789 (avg. 324 μg ml-1) for F. solani isolates, indicating presence of resistance to this important fungicide among some Fusarium isolates. This appears to be the first report of contamination with R. solani, P. periplocum, F. solani, F. equiseti and F. lichenicola of organic manures. This study appears to report for the first time F. lichenicola in Oman and appears to be the first report of occurrence of resistance to hymexazol among F. equiseti and F. solani isolates.

AB - A study was conducted to investigate the most common fungal and oomycete pathogens introduced into farms in Oman via potting mixtures and organic manures. A total of 37 commercial types of potting mixtures (2 local and 35 imported from overseas), 4 commercial types of organic manures and 11 non-commercial types of organic manures were included in the study. Identification of the isolated species was based on morphological characteristics, except for the most common species which were further identified using sequences of the internal transcribed spacer region of the ribosomal DNA (ITS rDNA). Fusarium spp. (14%), Pythium aphanidermatum (3%), Alternaria spp. (5%), Helminthosporium spp. (5%) and Cladosporium spp. (3%) were recovered at different frequencies from samples of potting mixtures. Fusarium solani (40%) and Fusarium equiseti (47%) were recovered at high frequencies from samples of organic manures. Isolations from organic manures also yielded Pythium periplocum (7%), Rhizoctonia solani (7%), Fusarium lichenicola (7%), Helminthosporium spp. (27%) and Alternaria spp. (27%). Trichoderma spp., Penicillium spp., Aspergillus spp. and Rhizopus spp. were found to be common in samples of potting mixtures and organic manures. Investigating sensitivity to hymexazol among 9 isolates of F. equiseti and 13 isolates of F. solani revealed variations among different isolates. The EC50 values ranged from 1 to over 1200 (avg. 192 μg ml-1) for F. equiseti isolates and from 135 to 789 (avg. 324 μg ml-1) for F. solani isolates, indicating presence of resistance to this important fungicide among some Fusarium isolates. This appears to be the first report of contamination with R. solani, P. periplocum, F. solani, F. equiseti and F. lichenicola of organic manures. This study appears to report for the first time F. lichenicola in Oman and appears to be the first report of occurrence of resistance to hymexazol among F. equiseti and F. solani isolates.

KW - Fertilizer

KW - Fusarium

KW - ITS region

KW - Pythium

KW - Tachigaren

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U2 - 10.1016/j.cropro.2010.09.015

DO - 10.1016/j.cropro.2010.09.015

M3 - Article

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SN - 0261-2194

VL - 30

SP - 38

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JO - Crop Protection

JF - Crop Protection

IS - 1

ER -

Occurrence and characterization of fungi and oomycetes transmitted via potting mixtures and organic manures

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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