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Benzimidazole resistance offusarium species recovered from potatoes with dry rot from storages located in the Columbia basin of oregon and Washington

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Abstract

Fusarium species cause dry rot or seedpiece decay of potato tubers in storage and in the field. When potato storages were sampled in the Columbia Basin of Oregon and Washington,F. sambucinum, F. oxysporum, andF. solani were the predominantFusarium species recovered from potato tubers with dry rot. OtherFusarium species recovered includedF. avenaceum, F. culmorum, F. equiseti, F. proliferatum, andF. sporotrichioides. The majority ofF. sambucinum isolates tested were resistant to thiabendazole at 5, 10, and 25 mg liter-1 in amended potato dextrose agar (PDA), whereas resistance was less frequent inF. oxysporum andF. solani isolates. When isolates ofF. sambucinum, F. solani, andF. oxysporum were grown on PDA with no thiabendazole, the average colony diameter of isolates with resistance to thiabendazole was greater than the average colony diameter of isolates sensitive to thiabendazole for each respective species. When isolates ofF. sambucinum were placed on tuber slices, lesions were apparent by four days after inoculation, and lesion diameters were generally greater than those associated withF. solani orF. oxysporum. At eight days after inoculation onto tuber slices, the average lesion diameter ofF. sambucinum, F. solani, orF. oxysporum isolates with resistance to thiabendazole was greater than the average lesion diameter of isolates sensitive to thiabendazole for each respective species. Thiabendazole-resistance was also detected inF. avenaceum, F. culmorum, F. equiseti, andF. sporotrichioides.

Resumen

Las especies deFusarium causan pudrición seca del tubérculo de papa o pudriciones en el almacén y el campo. Cuando se hizo un muestreo en la Cuenca Columbia de Oregon y Washington,F. sambucinum, F. oxysporum yF. solani fueron las especies predominates extraídas de tubérculos de papa con pudrición seca. Otras especies extraídas incluyeronF. avenaceum, F. culmorum, F. equiseti, F. proliferatum yF. sporotrichioides. La mayoría de aislamientos probados deF. sambucinum fueron resistentes al thiabendazole en a 5, 10 y 25mg/L-1 en papa-dextrosa-agar (PDA) modificado, mientras que la resistencia fue menos frecuente en aislamientos deF. oxysporum yF. solani. Cuando se sembraron aislamientos deF. sambucinum, F. solani yF. oxysporum en PDA sin thiabendazole, el diámetro promedio de la colonia de los aislamientos con resistencia a thiabendazole fue mayor que el diámetro promedio de los aislamientos sensibles al thiabendazole para la especie respectiva. Cuando los aislamientos deF. sambucinum fueron colocados en rodajas de tubérculo, las lesiones fueron visibles cuatro días después de la inoculación y el diámetro de las lesiones fue mayor que aquel asociado conF. solani o conF. oxysporum. A los ocho de la inoculación en rodajas, el diámetro promedio de la lesión de los aislamientos deF. sambucinum, F. solani oF. oxysporum con resistencia a thiabendazole fue mayor que el diámetro promedio de los aislamientos sensibles a este producto para cada especie. También se detectó resistencia al thiabendazole enF. avenaceum, F. culmorum, F. equiseti yF. sporotrichioides.

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Authors and Affiliations

  1. Dept. of Botany and Plant Pathology, Oregon State University, 97331-2902, Corvallis, OR, USA

    Cynthia M. Ocamb & Philip B. Hamm

  2. Hermiston Agricultural Research and Extension Center, Oregon State University, 97838, Hermiston, OR, USA

    Philip B. Hamm

  3. Dept. of Plant Pathology, Washington State University, 99164-6430, Pullman, WA, USA

    Dennis A. Johnson

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  1. Cynthia M. Ocamb
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  2. Philip B. Hamm
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  3. Dennis A. Johnson
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Correspondence to Cynthia M. Ocamb.

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Ocamb, C.M., Hamm, P.B. & Johnson, D.A. Benzimidazole resistance offusarium species recovered from potatoes with dry rot from storages located in the Columbia basin of oregon and Washington. Amer J of Potato Res 84, 169–177 (2007). https://doi.org/10.1007/BF02987140

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