Response of Colletotrichum lindemuthianum to benomyl

By:

Tu, J.C

Contributor(s):

JARVIS, W.R

Material type: Article

ArticleLanguage: English Description: 1:12-16Subject(s): LOC classification:

12365

In: Canadian Journal of Plant PathologySummary: De 3 fungicidas de bencimidazole ensayados, Tecto (tiabendazole) fue al menos eficaz en la inhibicion de la germinacion de esporas de la raza delta de Colletotrichum lindemuthianum. Easout (tiofanato-metilo) y Benlate (benomil) fueron mas eficaces, pero una pequena proporcion de esporas germino y sobrevivio a 20, 100 y 500 micro g/ml del i.a. resp. La germinabilidad y la tasa de supervivencia de las esporas disminuyeron a medida que aumentaba la concentracion de tiofanato- metilo y benomil, y las esporas ya germinadas no se desarrollaron en colonias tipicas. En vez de esto se transformaron en estructuras similares a esclerocios (ESE), las cuales eran acervulos endurecidos. En agar de benomil, las ESE variaron de tamano aprox 0,2-5 mm(3) despues de 3 semanas de crecimiento. Se formaron numerosas esporas en la superficie superior de las ESE, algunas de las cuales eran viables y patogenicas. Cuando se transfirieron las ESE a medios libres de benomil, se desarrollaron colonias tipicas de hongos. No hubo diferencias en el crecimiento de la colonia, la morfologia y la patogenicidad entre un aislado recuperado del benomil y del original. (RA-CIAT)Summary: Of 3 benzimidazole fungicides tested, Tecto (thiabendazole) was the least effective in inhibiting germination of spores of the delta race of Colletotrichum lindemuthianum. Easout (thiophanatemethyl) and Beniate (benomyl) were more effective, but a small proportion of spores germinated and survived at 20, 100 and 500 micro/ml of the resp. a. i. The germinability and survival rate of the spores decreased as the concn of thiophanate-methyl and benomyl increased, and the germinated spores failed to develop into typical colonies. Instead they developed into sclerotium-like structures (SLS), which were hardened acervuli. On benomyl agar the SLS varied in size from about 0.2-5 mm(3) after 3 wk growth. Numerous spores were formed on the upper surface of the SLS, some of which were viable and pathogenic. Upon transferring the SLS to benomyl-free media, typical fungal colonies developed. There were no apparent differences in colony growth, morphology and pathogenicity between an isolate recovered from benomyl and the original. (AS)

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Holdings
Item type	Current library	Collection	Call number	Copy number	Status	Date due	Barcode	Item holds
Journal Article	CIAT Library Document collection CINFOS	Document Collection CINFOS	12365 (Browse shelf(Opens below))	c.1	Short Loan		100059761

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De 3 fungicidas de bencimidazole ensayados, Tecto (tiabendazole) fue al menos eficaz en la inhibicion de la germinacion de esporas de la raza delta de Colletotrichum lindemuthianum. Easout (tiofanato-metilo) y Benlate (benomil) fueron mas eficaces, pero una pequena proporcion de esporas germino y sobrevivio a 20, 100 y 500 micro g/ml del i.a. resp. La germinabilidad y la tasa de supervivencia de las esporas disminuyeron a medida que aumentaba la concentracion de tiofanato- metilo y benomil, y las esporas ya germinadas no se desarrollaron en colonias tipicas. En vez de esto se transformaron en estructuras similares a esclerocios (ESE), las cuales eran acervulos endurecidos. En agar de benomil, las ESE variaron de tamano aprox 0,2-5 mm(3) despues de 3 semanas de crecimiento. Se formaron numerosas esporas en la superficie superior de las ESE, algunas de las cuales eran viables y patogenicas. Cuando se transfirieron las ESE a medios libres de benomil, se desarrollaron colonias tipicas de hongos. No hubo diferencias en el crecimiento de la colonia, la morfologia y la patogenicidad entre un aislado recuperado del benomil y del original. (RA-CIAT) spa

Of 3 benzimidazole fungicides tested, Tecto (thiabendazole) was the least effective in inhibiting germination of spores of the delta race of Colletotrichum lindemuthianum. Easout (thiophanatemethyl) and Beniate (benomyl) were more effective, but a small proportion of spores germinated and survived at 20, 100 and 500 micro/ml of the resp. a. i. The germinability and survival rate of the spores decreased as the concn of thiophanate-methyl and benomyl increased, and the germinated spores failed to develop into typical colonies. Instead they developed into sclerotium-like structures (SLS), which were hardened acervuli. On benomyl agar the SLS varied in size from about 0.2-5 mm(3) after 3 wk growth. Numerous spores were formed on the upper surface of the SLS, some of which were viable and pathogenic. Upon transferring the SLS to benomyl-free media, typical fungal colonies developed. There were no apparent differences in colony growth, morphology and pathogenicity between an isolate recovered from benomyl and the original. (AS) eng