BOTRYTIS ALLII PDF

Top of page There has been a certain lack of clarity in the literature about the species of Botryotinia and Botrytis causing neck rot on onion. The fungus mainly referred to in the literature is the anamorph Botrytis byssoidea, which was described by Walker Most authors do not refer to any teleomorph of B. In fact, a teleomorph for B. Nevertheless, the fungus has been found to sporulate on infected plants when it would not do so on standard media Shirane et al.

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Top of page There has been a certain lack of clarity in the literature about the species of Botryotinia and Botrytis causing neck rot on onion. The fungus mainly referred to in the literature is the anamorph Botrytis byssoidea, which was described by Walker Most authors do not refer to any teleomorph of B.

In fact, a teleomorph for B. Nevertheless, the fungus has been found to sporulate on infected plants when it would not do so on standard media Shirane et al.

Furthermore, an investigation of the phylogeny of some species placed in Ciborinia not including C. Jarvis ; did not address the question of the anamorph-teleomorph connection.

Some authors Moore, ; Smith et al. However, this would imply that B. Lacy and Lorbeer have suggested further that B. According to Yamamoto et al. Paraphyses filiform, hyaline, septate, with two to three branches. Sclerotia blackish-brown to black, subepidermal, densely pitted on the upper surface, x 0. Tamura et al. Erect conidiophores of B. They are light to dark brown, septate and thick-walled, with a swollen base and occasional branches that are constricted at their bases. Hennebert recognized B.

Presly described B. It also differed from B. Shirane et al. The relationships among three of the Botrytis species on Allium have been elucidated through examination of molecular biology. Each of the parents has 16 chromosomes, whereas the hybrid has 32 Nielsen et al. Distribution Table Top of page The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status.

Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.

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Pourriture du collet sur oignon et échalote

Biology[ edit ] There are seven different species of Botrytis associated with onions in storage but the rot induced by B. The two can be distinguished microscopically; the conidia of B. The infection is present in the field but does not manifest itself until after harvest, however there may be a falling off of vigour while the crop is still growing, particularly in cool, moist weather. In the stored crop, the rot typically starts in the neck of the bulb but can occur in other parts if there is physical injury. A mass of grey conidiophores and conidia develop on the mycelium and blackish sclerotia form at the site of the initial infection. Concentric grey rings may form as the fungus sporulates and the crop may lodge become flattened.

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