Henri Maraite - Academia.edu (original) (raw)

Papers by Henri Maraite

Research paper thumbnail of Sclerotial germination, growth rate and optimum temperature of Belgian and foreign isolates of Typhula incarnata Lasch ex. Fries

Research paper thumbnail of PIP - Itinéraire technique manguier

Research paper thumbnail of Mycosphaerella graminicola strains with different levels of QoI resistance have similar frequencies for the G143 A mutation

Aspects of applied biology, 2006

Analysis of QoI sensitivity of Mycosphaerella graminicola strains isolated in Belgium was perform... more Analysis of QoI sensitivity of Mycosphaerella graminicola strains isolated in Belgium was performed in PD broth in microtitre plates. The frequency distribution of EC50 values for azoxystrobin revealed at least three populations, a QoI sensitive population with EC50 values ranging from 0.01 to 0.64 mg L-1 azoxystrobin (median 0.04) , a QoI resistant one with EC50 values ranging from 1.28 to 20.48 mg L-1 azoxystrobin (median 5.12) and a highly QoI resistant one with EC50 values exceeding to 20.48 mg L-1. The relative proportion of the two QoI resistant populations varied between 2003 and 2005. The quantification of the frequency of G 143 A mutation was assessed by real-time polymerase chain reaction (PCR). Strains with EC50 values ranging from 1.28 to >31.62 mg L-1 azoxystrobin had the same mutation frequency. Moreover, a greenhouse assay on strains from those three populations showed that the difference of EC50 values between the two resistant populations was not correlated with a loss of azoxystrobin efficacy.

Research paper thumbnail of Transmission of Viruses by Soil Fungi

Elsevier eBooks, 1991

The Plasmodiophoromycetes Polymyxa betae, P. graminis and Spongospora subterranea, and the Chytri... more The Plasmodiophoromycetes Polymyxa betae, P. graminis and Spongospora subterranea, and the Chytridiomycetes Olpidium brassicae and O. radicale have been associated with the transmission of up to 30 viruses or virus-like organisms on various crops from temperate and tropical areas. All are obligate parasites in cortical root cells and form resting spores with high survival capacity in the soil. Under imperfectly understood conditions, primary zoospores are released in the soil water, swim to the roots and, after encystment, introduce their content into the cytoplasm of the host cell. The thallus is membrane-delimited, at least during the first stages, and develops into a zoosporangium, releasing secondary zoospores, or, under almost unknown conditions, into resting spores released with decay of the roots. The cytoplasm of plasmodiophorid vectors mainly acquire furoviruses or filamentous viruses in the host and transmit them in a persistent manner. In a similar way, chytrids acquire and transmit some very labile rod-shaped viruses and unidentified agents, but several isometric viruses can also adhere to the zoospore surface and flagella in the soil, and are transmitted in a non-persistent manner. The vectors show various degrees of host specificity, up to cultivar level. Viruses also appear variable, some having a bi- or multipartite genome; the capacity of transmission by the vector or spread in the plant is determined by RNAs which are sometimes lost after mechanical inoculation. Various degrees of vector- and host-specificity are reported, as well as transmission to non-hosts of the vector. Vector development can be affected by the virus. Control is based mainly on virus-resistant cultivars, the use of fungicides or surfactants being limited to hydroponic cropping systems. Resistance breakdown resulting from simultaneous infection by two viruses has been noted. Limitation of the development of an aggressive virus by less aggressive ones is not sufficiently documented. Hyperparasitism on resting spores and a limitation of vector development in the soil, compared to sterile substrata, has been observed, but more research concerning the potential of biological control is needed.

Research paper thumbnail of Bacterial sheath brown rot of rice caused by<i>Pseudomonas fuscovaginae</i>in Malagasy

Tropical pest management, 1990

Bacterial sheath brown rot, caused by Pseudomonas fuscovaginae appeared to be widespread in irrig... more Bacterial sheath brown rot, caused by Pseudomonas fuscovaginae appeared to be widespread in irrigated rice between 1300 and 2000 m elevation in Malagasy. Inhibition of panicle emergence increased with altitude. Local cultivars suffered much less than the introduced half‐dwarf ones from the International Rice Research Institute or the International Rice Cold Tolerance Nursery. In basic biochemical and serological tests, 22

Research paper thumbnail of Influence of fungicide control on cereal yields in 1990

Research paper thumbnail of Bacterial sheath brown rot caused by Pseudomonas fuscovaginae in wheat

Research paper thumbnail of Comparative symptom development in cassava after infection by Xanthomonas manihotis or X. cassavae under controlled conditions

Research paper thumbnail of Physiological and pathogenic variations in Xanthomonas campestris pv. manihotis

Research paper thumbnail of Pathological and Molecular Characterization of <i>Xanthomonas campestris</i> Strains Causing Diseases of Cassava ( <i>Manihot esculenta</i> )

Applied and Environmental Microbiology, Dec 1, 1994

Research paper thumbnail of Biodegradation of the insecticide carbofuran in the soil of cauliflower and Brussels sprouts field cultures

Mededelingen van de Faculteit Landbouwwetenschappen, Rijksuniversiteit Gent, Apr 17, 1987

Research paper thumbnail of 紅脂の大きさに関する研究の進展【JST・京大機械翻訳】

Research paper thumbnail of Progress in study on the fungi associated with Dendroctonus valens

Scientia Silvae Sinicae, 2008

Red turpentine beetle(Dendroctonus valens,RTB),which was probably introduced from USA,is one of t... more Red turpentine beetle(Dendroctonus valens,RTB),which was probably introduced from USA,is one of the most important invasive pests in Chinese forest ecological system.The beetle traits had changed a lot since it was introduced to China,and the changed traits were linked to the abnormal mortality of Pinus tabulaeformis caused by the beetle in the northern China.Ophiostomatoid fungi were well-known to have widespread symbiotic relationship with the beetles,such as Coleoptera:Scolytidae.The symbiotic fungi were of benefit for the insects to establish their population,and the symbiosis integrated to destruct the defense devices of the host(Pinus tabulaeformis).The paper mainly reviewed the study on the fungi associated with RTB in North American.There are around 10 species of ophiostomatoid fungi recorded associated with RTB in their original regions.Among them,Leptographium terebrantis,L.procerum,L.wingfieldii and Grosmannia wageneri are common and have relatively close associates of RTB.Their morphological features,phylogenetic relationships,life habits and pathogenicity were compared in details.Particular attention should be paid to these important forest pathogens invading to China and causing damage to Chinese forest ecosystem.The research perspective of fungi associated with bark beetle in China was also discussed.

Research paper thumbnail of Coffee Wilt Disease: a major constraint to coffee production in Africa

Research paper thumbnail of Development of an interactive decision-support system on a Web site for control of Mycosphaerella graminicola in winter wheat

Eppo Bulletin, Mar 1, 2000

A decision‐support system (DSS) has been developed in Belgium to help farmers and advisers to man... more A decision‐support system (DSS) has been developed in Belgium to help farmers and advisers to manage Mycosphaerella graminicola in winter wheat during stem elongation. The system calculates in real time the interactions between winter wheat and M. graminicola development to simulate disease progression in the canopy in order to guide field observations on the different leaf layers and determine the risks for the crop. It has been structured to run with individual field input and local hourly meteorological data. An interactive Internet version of the system has been developed to facilitate the delivery of information. It allows users to base their decisions on advice tailored to conditions in their own fields, as well as to recent and validated hourly local meteorological data that is regularly updated on the server computer.

Research paper thumbnail of Development of a quantitative method for assessment of Polymyxa graminis Led. inoculum potential in soils

CRC Press eBooks, Jul 26, 2020

Research paper thumbnail of Unusual Requirement for a Vitamin by Strains of Fusarium oxysporum f. sp. melonis

Nature, Oct 1, 1967

ABSTRACT

Research paper thumbnail of Draft Genome Sequence of Pseudomonas fuscovaginae, a Broad-Host-Range Pathogen of Plants

Journal of Bacteriology, Apr 24, 2012

Research paper thumbnail of Characterization of Pseudomonas fuscovaginae and Differentiation from Other Fluorescent Pseudomonads Occurring on Rice in Burundi

Journal of Phytopathology, Jun 1, 1988

Research paper thumbnail of Determination of residues of carbetamide and its derivatives in the soil and in field-grown lettuce

Plant and Soil, Mar 1, 1987

ABSTRACT

Research paper thumbnail of Sclerotial germination, growth rate and optimum temperature of Belgian and foreign isolates of Typhula incarnata Lasch ex. Fries

Research paper thumbnail of PIP - Itinéraire technique manguier

Research paper thumbnail of Mycosphaerella graminicola strains with different levels of QoI resistance have similar frequencies for the G143 A mutation

Aspects of applied biology, 2006

Analysis of QoI sensitivity of Mycosphaerella graminicola strains isolated in Belgium was perform... more Analysis of QoI sensitivity of Mycosphaerella graminicola strains isolated in Belgium was performed in PD broth in microtitre plates. The frequency distribution of EC50 values for azoxystrobin revealed at least three populations, a QoI sensitive population with EC50 values ranging from 0.01 to 0.64 mg L-1 azoxystrobin (median 0.04) , a QoI resistant one with EC50 values ranging from 1.28 to 20.48 mg L-1 azoxystrobin (median 5.12) and a highly QoI resistant one with EC50 values exceeding to 20.48 mg L-1. The relative proportion of the two QoI resistant populations varied between 2003 and 2005. The quantification of the frequency of G 143 A mutation was assessed by real-time polymerase chain reaction (PCR). Strains with EC50 values ranging from 1.28 to >31.62 mg L-1 azoxystrobin had the same mutation frequency. Moreover, a greenhouse assay on strains from those three populations showed that the difference of EC50 values between the two resistant populations was not correlated with a loss of azoxystrobin efficacy.

Research paper thumbnail of Transmission of Viruses by Soil Fungi

Elsevier eBooks, 1991

The Plasmodiophoromycetes Polymyxa betae, P. graminis and Spongospora subterranea, and the Chytri... more The Plasmodiophoromycetes Polymyxa betae, P. graminis and Spongospora subterranea, and the Chytridiomycetes Olpidium brassicae and O. radicale have been associated with the transmission of up to 30 viruses or virus-like organisms on various crops from temperate and tropical areas. All are obligate parasites in cortical root cells and form resting spores with high survival capacity in the soil. Under imperfectly understood conditions, primary zoospores are released in the soil water, swim to the roots and, after encystment, introduce their content into the cytoplasm of the host cell. The thallus is membrane-delimited, at least during the first stages, and develops into a zoosporangium, releasing secondary zoospores, or, under almost unknown conditions, into resting spores released with decay of the roots. The cytoplasm of plasmodiophorid vectors mainly acquire furoviruses or filamentous viruses in the host and transmit them in a persistent manner. In a similar way, chytrids acquire and transmit some very labile rod-shaped viruses and unidentified agents, but several isometric viruses can also adhere to the zoospore surface and flagella in the soil, and are transmitted in a non-persistent manner. The vectors show various degrees of host specificity, up to cultivar level. Viruses also appear variable, some having a bi- or multipartite genome; the capacity of transmission by the vector or spread in the plant is determined by RNAs which are sometimes lost after mechanical inoculation. Various degrees of vector- and host-specificity are reported, as well as transmission to non-hosts of the vector. Vector development can be affected by the virus. Control is based mainly on virus-resistant cultivars, the use of fungicides or surfactants being limited to hydroponic cropping systems. Resistance breakdown resulting from simultaneous infection by two viruses has been noted. Limitation of the development of an aggressive virus by less aggressive ones is not sufficiently documented. Hyperparasitism on resting spores and a limitation of vector development in the soil, compared to sterile substrata, has been observed, but more research concerning the potential of biological control is needed.

Research paper thumbnail of Bacterial sheath brown rot of rice caused by<i>Pseudomonas fuscovaginae</i>in Malagasy

Tropical pest management, 1990

Bacterial sheath brown rot, caused by Pseudomonas fuscovaginae appeared to be widespread in irrig... more Bacterial sheath brown rot, caused by Pseudomonas fuscovaginae appeared to be widespread in irrigated rice between 1300 and 2000 m elevation in Malagasy. Inhibition of panicle emergence increased with altitude. Local cultivars suffered much less than the introduced half‐dwarf ones from the International Rice Research Institute or the International Rice Cold Tolerance Nursery. In basic biochemical and serological tests, 22

Research paper thumbnail of Influence of fungicide control on cereal yields in 1990

Research paper thumbnail of Bacterial sheath brown rot caused by Pseudomonas fuscovaginae in wheat

Research paper thumbnail of Comparative symptom development in cassava after infection by Xanthomonas manihotis or X. cassavae under controlled conditions

Research paper thumbnail of Physiological and pathogenic variations in Xanthomonas campestris pv. manihotis

Research paper thumbnail of Pathological and Molecular Characterization of <i>Xanthomonas campestris</i> Strains Causing Diseases of Cassava ( <i>Manihot esculenta</i> )

Applied and Environmental Microbiology, Dec 1, 1994

Research paper thumbnail of Biodegradation of the insecticide carbofuran in the soil of cauliflower and Brussels sprouts field cultures

Mededelingen van de Faculteit Landbouwwetenschappen, Rijksuniversiteit Gent, Apr 17, 1987

Research paper thumbnail of 紅脂の大きさに関する研究の進展【JST・京大機械翻訳】

Research paper thumbnail of Progress in study on the fungi associated with Dendroctonus valens

Scientia Silvae Sinicae, 2008

Red turpentine beetle(Dendroctonus valens,RTB),which was probably introduced from USA,is one of t... more Red turpentine beetle(Dendroctonus valens,RTB),which was probably introduced from USA,is one of the most important invasive pests in Chinese forest ecological system.The beetle traits had changed a lot since it was introduced to China,and the changed traits were linked to the abnormal mortality of Pinus tabulaeformis caused by the beetle in the northern China.Ophiostomatoid fungi were well-known to have widespread symbiotic relationship with the beetles,such as Coleoptera:Scolytidae.The symbiotic fungi were of benefit for the insects to establish their population,and the symbiosis integrated to destruct the defense devices of the host(Pinus tabulaeformis).The paper mainly reviewed the study on the fungi associated with RTB in North American.There are around 10 species of ophiostomatoid fungi recorded associated with RTB in their original regions.Among them,Leptographium terebrantis,L.procerum,L.wingfieldii and Grosmannia wageneri are common and have relatively close associates of RTB.Their morphological features,phylogenetic relationships,life habits and pathogenicity were compared in details.Particular attention should be paid to these important forest pathogens invading to China and causing damage to Chinese forest ecosystem.The research perspective of fungi associated with bark beetle in China was also discussed.

Research paper thumbnail of Coffee Wilt Disease: a major constraint to coffee production in Africa

Research paper thumbnail of Development of an interactive decision-support system on a Web site for control of Mycosphaerella graminicola in winter wheat

Eppo Bulletin, Mar 1, 2000

A decision‐support system (DSS) has been developed in Belgium to help farmers and advisers to man... more A decision‐support system (DSS) has been developed in Belgium to help farmers and advisers to manage Mycosphaerella graminicola in winter wheat during stem elongation. The system calculates in real time the interactions between winter wheat and M. graminicola development to simulate disease progression in the canopy in order to guide field observations on the different leaf layers and determine the risks for the crop. It has been structured to run with individual field input and local hourly meteorological data. An interactive Internet version of the system has been developed to facilitate the delivery of information. It allows users to base their decisions on advice tailored to conditions in their own fields, as well as to recent and validated hourly local meteorological data that is regularly updated on the server computer.

Research paper thumbnail of Development of a quantitative method for assessment of Polymyxa graminis Led. inoculum potential in soils

CRC Press eBooks, Jul 26, 2020

Research paper thumbnail of Unusual Requirement for a Vitamin by Strains of Fusarium oxysporum f. sp. melonis

Nature, Oct 1, 1967

ABSTRACT

Research paper thumbnail of Draft Genome Sequence of Pseudomonas fuscovaginae, a Broad-Host-Range Pathogen of Plants

Journal of Bacteriology, Apr 24, 2012

Research paper thumbnail of Characterization of Pseudomonas fuscovaginae and Differentiation from Other Fluorescent Pseudomonads Occurring on Rice in Burundi

Journal of Phytopathology, Jun 1, 1988

Research paper thumbnail of Determination of residues of carbetamide and its derivatives in the soil and in field-grown lettuce

Plant and Soil, Mar 1, 1987

ABSTRACT