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Effects of copper and copper fungicide soil residues on Phytophthora infestans

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Summary

Analysis of soils from plots in which potatoes had been sprayed with copper fungicides showed that the amount of water extractable copper remained fairly constant at 5 to 7 ppm, while the content of replaceable copper ranged from 20 to 92 ppm.

Copper was found to impair the germination ofP. infestans sporangia to a greater extent than that of zoospores. Copper also affected the mode of germination of sporangia and the growth of germ tubes from sporangia and zoospores.

Germination of sporangia was not markedly reduced in leachates from soils with a low replaceable copper content (1–50 ppm replaceable copper). In contrast, sporangial germination was markedly reduced in leachates from soils with a replaceable copper content over 50 ppm.

Growth ofP. infestans on soil slurries was inhibited by soils that contained high residues of Bordeaux mixture. Residues from the combination of a Difolatan soil treatment and of Bordeaux mixture foliar sprays resulted in complete inhibition of fungal growth on the soil slurries.

Resumen

Los análisis de suelos de lotes en los cuales las papas habían sido rociadas con fungicidas de cobre han indicado que la cantidad de cobre extraíble con agua permanece más o menos constante al 5–7 ppm mientras el contenido de cobre reemplazable varía de 20 a 92 ppm.

Se encontró que el cobre reduce la germinación de los esporangios deP. infestans más que la de las zoosporas. El cobre influencia también la germinación de esporangios y la crecida de los tubos germinales de esporangios y zoosporas.

La germinación de esporangios no ha sido reducida notablemente en lixiviados de suelos con un contenido bajo en cobre reemplezable (1–50 ppm de cobre reemplazable). Al contrario la germinación esporangial ha sido reducida notablemente en lixiviados de suelos con un contenido de cobre reemplazable mayor de 50 ppm.

El crecimiento deP. infestans en suelos licuefactos fué inhibido en suelos con alto contenido de resíduos de mezcla de Bordeaux. Resíduos resultantes de una combinación de un tratamiento de suelo con Difolatan y aspersiones foliares con la mezcla de Bordeaux resultaron en una inhibición completa de crecimiento de hongos en suelos licuefactos.

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Authors and Affiliations

  1. Department of Plant Pathology, New York State College of Agriculture, Cornell University, Ithaca, New York

    Simeon S. Leach (Graduate Assistant)

  2. Botany Dept., University of New Hampshire, Durham, New Hampshire

    Simeon S. Leach (Graduate Assistant)

Authors
  1. Simeon S. Leach
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Additional information

This investigation was supported in part by a researach grant from Phelps Dodge Refining Corporation, New York, New York.

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Leach, S.S. Effects of copper and copper fungicide soil residues on Phytophthora infestans. American Potato Journal 43, 431–438 (1966). https://doi.org/10.1007/BF02862731

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  • DOI: https://doi.org/10.1007/BF02862731

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