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Potato leafroll virus spread in differentially resistant potato cultivars under varying aphid densities

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Abstract

An action threshold of 3-10 green peach aphid,Myzus persicae (Sulzer), apterae per 100 lower leaves is recommended for use in Minnesota to prevent further spread of potato leafroll virus (PLRV) in potato,Solarium tuberosum L. This threshold was first developed and validated using the PLRV susceptible cultivar Russet Burbank. Here we report experiments to determine if higher aphid densities could be tolerated in PLRV resistant cultivars,i.e., Kennebec (moderately resistant) or Cascade (highly resistant), without an increase in PLRV infection. Insecticidal sprays were applied to plots when predetermined target aphid densities, based on number of apterae per 100 leaves, were reached: 3, 10, 30, and 100 (Russet Burbank); 10, 30, 100, and 300 (Kennebec); and 30, 100, 300, and 1000 (Cascade). The response variable was the average percentage of PLRV infected plants. Overall mean cumulative aphid-days and percent PLRV infection were 617 and 23.5% for Russet Burbank, 1,296 and 10.2% for Kennebec, and 4,816 and 9.5% for Cascade. For each cultivar, the highest target aphid density tolerated without an increase in PLRV spread was determined by comparing PLRV infection in plots sprayed on predetermined thresholds to PLRV infection in plots where aphids were rigorously controlled. This maximum density was 10 apterae per 100 leaves for Russet Burbank and 300 apterae per 100 leaves for Cascade. Results using Kennebec were ambiguous, but Kennebec was always more resistant to PLRV than Russet Burbank. Excised leaflet tests showed that the cultivars did not differ in resistance to green peach aphid. It appears that action thresholds based on green peach aphid apterae can be different depending upon the inherent PLRV-resistance of the cultivar.

Compendio

Se recomienda la actividad de un mínimo de 3-10 áfidos verdes del melocotonero,Myzus persicae (Sulzer), ápteros por 100 hojas inferiores, a utilizarse en Minnesota para prevenir una mayor diseminación del virus del enrollamiento de la hoja (PLRV) en la papa,Solanum tuberosum L. Este mínimo se desarrollo y evaluó primero utilizando el cultivar Russet Burbank, susceptible al PLRV. Reportamos aquí los experimentos para determinar si densidades mayores del áfido podrían ser toleradas en cultivares resistentes al PLRV, tales como Kennebec (moderadamente resistente) o Cascade (altamente resistente), sin un incremento en la infección por el virus. Se aplicaron aspersiones de insecticidas a parcelas donde se alcanzaron densidades-meta predeterminadas de áfidos, en base al número de ápteros por 100 hojas: 3, 10, 30y 100 (Russet Burbank); 10, 30, 100 y 300 (Kennebec); y 30, 100, 300 y 1,000 (Cascade). La variable de respuesta fue el porcentaje promedio de plantas infectadas con PLRV. El promedio general acumulado de áfidos-días y el porcentaje de infección con PLRV fueron 6l7 y 23.5% para Russet Burbank, 1,296 y 10.2% para Kennebec, y 4,816 con 9.5% para Cascade. Para cada cultivar, se determinó la densidad-meta más alta de áfidos tolerada sin un incremento en la diseminación del PLRV comparando la infección con PLRV en las parcelas asperjadas sobre los mínimos predeterminados con la infección con PLRV en las parcelas donde los áfidos fueron rigurosamente controlados. Esta densidad máxima fue de 10 ápteros por 100 hojas para Russet Burbank y 300 ápteros por 100 hojas para Cascade. Los resultados con Kennebec fueron ambiguos, pero este cultivar fue siempre más resistente al PLRV que Russet Burbank. Pruebas con foliolos removidos mostraron que los cultivares no difirieron en su resistencia al áfido verde del melocotonero. Parece que la actividad mínima basada en los ápteros del áfido verde del melocotonero puede ser diferente dependiendo de la resistencia al PLRV inherente del cultivar.

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DiFonzo, C.D., Ragsdale, D.W. & Radcliffe, E.B. Potato leafroll virus spread in differentially resistant potato cultivars under varying aphid densities. American Potato Journal 72, 119–132 (1995). https://doi.org/10.1007/BF02987284

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