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Influences of the Rhizoctonia disease on production of the Russet Burbank potato

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Abstract

Pentachloronitrobenzene (PCNB) treatment (20 lb/A – 22.4 kg/ha) showed significant reduction ofRhizoctonia (Rhizoctonia solani Kühn) symptoms on potato. The PCNB treatment increased the number of non-girdled stolons as compared to untreated plots by 50, 34, and 30% at respective seedpiece spacings of 6, 9, and 12 in (15, 23, and 30 cm). Numbers of non-girdled stolons in PCNB-treated plots at 9- and 12-in spacing did not differ significantly from those in untreated plots at 6-in spacing.

Yield differences (either total or U.S. #1) among treatments were not observed, but size differences were evident. Closer spacing or PCNB treatment or both increased the number of small U.S. #1 potatoes and decreased the number of large U.S. #1 potatoes (over 7 oz. - 199 g). Although the number of smaller potatoes was increased by 27% with PCNB treatment, the percentage of malformed tubers was reduced by 50%. Tuber size was reduced as the number of non-girdled stolons was increased (P =.001).

Results suggestthat Rhizoctonia control may benefit the fresh potato packer and seedgrower by potentially reducing seed requirement/acre, by increasing capacity for single-drop seed production, and by greater control over U.S. #1 size.

Resumen

Tratamiento con 22.4 Kg/ha pentacloronitrobenceno (PCNB) resultó en una disminución significativa de los síntomas deRhizoctonia (Rhizoctonia solani Kuhn). Tratamiento con PCNB redujo el número de estolones con lesiones circundantes en comparación con parcelas sin tratar en 50, 34 y 30% con siembras a distancias de 15, 23 y 30 cm, respectivamente. En parcelas tratadas con PCNB con distanciamientos de 23 y 30 cm, el número de estolones sin lesiones circundantes no fue significativamente diferente a parcelas sin tratar con distanciamientos de 15 cm.

No se observaron diferencias en rendimiento (total o de tamaño U.S. #1) entre tratamientos, pero si hubo diferencias evidentes en tamaño de tubérculos. Distanciamiento menor o tratamiento con PCNB, o ambos, incrementaron el número de tubérculos chicos dentro de la clasificación US # 1, disminuyendo el número de los US # 1 grandes (mayores de 199 g). Aunque el número de tubérculos chicos fue incrementado en 27% con tratamiento de PCNB, el porcentaje de tubérculos deformes se redujo en un 50%. El tamaño de los tubérculos disminuyó en relación al incremento de estolones no afectados por lesiones circundantes (P=0.001).

Los resultados sugieren que el control deRhizoctonia puede ser de beneficio al comerciante y productor de semilla por su potencial de reducir las necesidades de semilla/ha, el aumento de la capacidad de producción de semilla en siembra unitaria y por el mayor control sobre tamaño de tubérculos U.S. #1.

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Authors and Affiliations

  1. University of Idaho Research & Extension Center, 83210, Aberdeen, Idaho

    J. R. Davis (Research Professor of Plant Pathology)

  2. American Potato Corporation, 54467, Plover, Wisconsin

    M. D. Groskopp (Director of Raw Product Research)

Authors
  1. J. R. Davis
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  2. M. D. Groskopp
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Published with the approval of the Director of the Idaho Agric. Expt. Stn. as Research Paper No. 78719.

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Davis, J.R., Groskopp, M.D. Influences of the Rhizoctonia disease on production of the Russet Burbank potato. American Potato Journal 56, 253–264 (1979). https://doi.org/10.1007/BF02854309

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  • DOI: https://doi.org/10.1007/BF02854309

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