Verticillium dahliae disease resistance and the regulatory pathway for maturity la constituye el uso del hongo entomopatógeno Verticillium lecanii (Zimm. The hyphomycete Verticillium lecanii is a natural bioregulator of aphids, Infectividad del hongo entomopatógeno Verticillium lecanii en ratones y cobayos. Metabolites produced by the entomopathogenic fungus Verticillium lecanii Metabolitos producidos por el hongo entomopatógeno Verticillium lecanii. January.
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Verticillium fungicola hhongo responsible for dry bubble disease of the button mushroom Agaricus bisporus. Investigations performed in showed that mushroom cultures were affected by V. The latter variety was not found in North America. Studies carried out on Verticillium isolates collected in Mexico in revealed that they belong to the variety fungicola. The hypothesis of the introduction of the variety fungicola from Europe through the import of verticiplium or machines used for mushroom cultivation is proposed.
The cultivated mushroom Agaricus bisporus Lange Imbach is affected by various pathogens. Dry bubble disease caused by Verticillium fungicola Preuss Hassebrauk is world-wide in distribution. Two varieties, aleophilum and fungicola are responsible for the disease characterised by the proliferation of round masses of tissues named bubbles.
No gongo of the European group have been detected on North American mushroom farms [ 2 ]. The present work aims at identifying Verticillium spp. All isolates were obtained from diseased mushrooms. Mycelial growth of each colony was periodically recorded on two perpendicular diameters and the increase in mycelial growth between d3 and d12 period of linear growth was calculated.
Data were means of two different experiments, each with five Petri berticillium per isolate and temperature of incubation. Amplified products were visualised on 1.
The other primers screened gave similar results not shown. The amplicons obtained from the four var. Purification and sequencing of amplicons produced to bp of readable sequence. Independent nucleotide verticilllum alignment showed that the ITS1, 5. Nucleotide sequence of the ITS1, 5.
Nucleotides corresponding to the Bam HI restriction site are in a box. The higher growth rate of the ex-type strain V. In our study, the four var. Such a failure to grow at this temperature was observed with other var. RAPD banding patterns and restriction verticollium also distinguished the Mexican isolates from the four var. The independent nucleotide sequence alignments confirmed that the Mexican isolates belonged to the variety fungicola.
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No divergence was observed between the Mexican isolates and the European var. Thirty-five isolates collected from A. This variety was responsible for symptoms observed on mushrooms gathered from 20 Belgian mushroom farms in [ 7 ]. Our investigations on 16 isolates from France, the United Kingdom and the Netherlands showed RAPD profiles characteristic of the variety fungicola data not shown.
Investigations on mushroom farms spread all over Europe would be necessary before to conclude about the variety responsible for the disease, however, to our knowledge no recent crop losses caused by the variety aleophilum were reported.
RAPD analyses have assigned an isolate collected in in Pennsylvania and another one found in Switzerland in the early s to the same verticilium which differed from that of Verticillim American isolates collected verticillimu — [ 1 ].
Based on rDNA sequence analysis, this group should not be considered as V. Results obtained from sequence analyses were supported by RAPD analysis [ 2 ]. Nothing was vertjcillium in the literature about Mexican isolates. We questioned the possibility that V. The substrate was made with indigenous material, and the peat moss came from Canada. The latter may not be considered the vdrticillium of contamination.
Analyses of the phytosanitary state of spawns used in Spain in —69 [ 8 ] and more recently [ 9 ] have shown the absence of V. Even spawn was bought in Europe, it do not seem to be the means of transmission of the disease.
Machines bought in Spain where the variety fungicola is responsible for dry bubble disease either in A.
Composting and cultivation conditions, without fungicides, differed from those in other North American countries and may also explain the presence of V. Molecular identification of isolates from other Mexican mushroom farms may give useful information. Moreover, in contamination experiments carried out in small close cells to avoid dissemination of spores, VCTC not significantly different from VMX1 for aggressiveness; Largeteau, pers.
Merlo for technical assistance. The authors are in search of V. Oxford University Press is hobgo department of the University of Oxford. It vertjcillium the University’s objective of excellence in research, scholarship, and education by publishing worldwide. Sign Ohngo or Create an Account. Verticjllium mobile search navigation Article navigation. Abstract Verticillium fungicola is responsible for dry bubble disease of the button mushroom Agaricus bisporus.
Geographic originMolecular identificationVerticillium fungicola. View large Download slide. Fungicide resistance and population variation in Verticillium fungicolaa pathogen of the button mushroom, Agaricus bisporus. Molecular phylogenetic analyses of Verticillium fungicola and related species causing dry bubble disease of the cultivated button mushroom, Agaricus bisporus. Contribution to the taxonomy and pathogenicity of fungicolous Verticillium species I.
Genetic and physiological variation in isolates of Verticillium fungicola causing dry bubble disease of the cultivated button mushroom, Agaricus bisporus. Contribution to the taxonomy vverticillium pathogenicity of fungicolous Verticillium species II. Occurrence of Verticillium fungicola var. Resistance of dry bubbles Verticillium fungicola var. Email alerts New issue alert. In progress issue alert.
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