Botrytis aclada and allii, associated with onion gray-mold neck rot isolated in Hokkaido, were tested for sensitivity to benzimidazole. Of the B. strains, 59% highly resistant remaining 41% sensitive; all strains of allii sensitive. Resistant widespread Hokkaido. We analyzed sequences β-tubulin gene detected replacement glutamic acid (GAG) by lysine (AAG) at codon 198. This is first report benz...

Onion is cultivated worldwide for its bulbs, but production threatened by pathogens and pests. Three distinct diseases of onion are caused species that belong to the fungal genus Botrytis. Leaf blight a well-known foliar disease B. squamosa can cause serious yield losses. Neck rot postharvest manifests in bulbs after storage associated with three species: aclada, allii, byssoidea. The symptomle...

ABSTRACT Xanthomonas axonopodis pv. allii is phenotypically and genetically diverse and its relationship to other X. axonopodis pathovars within DNA homology group 9.2 is unknown. In growth chamber experiments, disease symptoms were produced on onion only by inoculation with X. axonopodis pv. allii. Citrus bacterial spot symptoms were induced by X. axonopodis pvs. alfalfae, itrumelo, and allii ...

Scientific name: Xanthomonas axonopodis pv. allii (Roumagnac et al., 2004a,b). Synonyms: Xanthomonas campestris pv. allii (Kadota et al., 2000). Taxonomic position: Proteobacteria: Gammapropteobacteria: Xanthomonadales: Xanthomonasdaceae. Common names: Xanthomonas axonopodis pv. allii is the causal agent of onion bacterial blight (syn. Xanthomonas leaf blight of onion). EPPO code: XANTAA. Phyto...

In earlier studies of the nature of parasitism and resistance associated with the smudge disease {Colletotrichum circinans [Berk.] Vogl.) of onion bulbs (3, 4) it has been shown that the host tissue contains certain substances which are toxic to the invading organism. These substances fall into two classes, (a) the volatile oils and certain associated nonvolatile compounds in the cell sap (6) a...