Anthracnose occurred frequently on leaf sheaths of Welsh onions grown in Gangwha island, Korea in November, 2007. The disease incidence was as high as 30% in five fields investigated. A total of 20 single spore isolates of Colletotrichum species were obtained from the affected plants, and all the isolates were identified as Colletotrichum circinans based on their morphological and cultural char...

The genus Colletotrichum contains many important plant pathogens mainly distributed in tropical areas. Previous studies that utilized morphology or single genes have failed to resolve the phylogenetic relationships among the species. In this study, sequences of β-tubulin, 28S ribosomal DNA, and ITS region from nine species were analyzed separately and combined to establish a fast method to infe...

COLLETOTRICHUM CIRCINANS AS A SEMIQUANTITATIVE TEST UNIT FOR THE GROWTH SUBSTANCE PRODUCED BY RHIZOPUS SUINUS WHILE testing the filtrate of Rhizopus suinus Nielson on the growth of various species of fungi, it was noted that Colletotrichum circinans (Berk.) Vogl. gave consistent increments in yield over a limited range of concentrations. This characteristic response of the organism mentioned su...

One new leafhopper genus, Circinans, is described with a new species Circinans striata sp. n. as the type species from southern China. Habitus photos and illustrations of male genitalia of this new species are given and differences between the new genus and closely related genera are discussed.

In a paper recently published in this Journal (1) we reported the isolation of the phenolic acid commonly known as protocatechuic acid (3,4-dihydroxybenzoic acid) from the outer bulb scales of pigmented onions. The occurrence of this acid in the outer scales has a significant relationship to disease resistance in the onion. Protocatechuic acid is apparently one of the chemical entities that ena...

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...

Species of Colletotrichum cause diseases on a wide range of hosts, frequently infecting plants in the Agavaceae (monocotyledons: Liliales). Three species of Colletotrichum restricted to the Agavaceae were detected through morphological studies of specimens and molecular sequence analyses of the LSU of the nu-rDNA and the ITS region of the nu-rDNA from cultures. Colletotrichum agaves on Agave is...