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Eh-pH map (Husson, et al.) — Eh–pH map of indicative zones where the main groups of pests or pathogens can thrive, corresponding to oxidized plants. Viruses develop in alkaline phloem and possibly xylem, as do most bacteria. Inversely, most fungi prefer the acidic and more oxidized apoplast. Oomycetes often thrive in moderately oxidized apoplast, usually at higher pH than their fungal counterparts. Insects have different preferences, according to their feeding mode: xylem- or phloem-sucking insects at higher pH and lower Eh compared with chewing-biting insects; larvae at lower pe + pH and higher pH compared with adults. These are only tendencies for the main groups of pathogens and pests, as optimal Eh–pH conditions are specific. Although some pathogens are ubiquitous and are able to develop in a large range of Eh–pH conditions, most pathogens can develop only in a specific, narrow Eh–pH range (Rabotnova and Schwartz 1962).

Crop nutrition

The Redox Revolution

January 2, 2026

The practical outworkings of how understanding Eh-pH homeostasis improves crop protection This is a continuation of last month’s article, “The ...

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The Biophysics of Pest Resistance

December 2025

The Biophysics of Pest Resistance

December 11, 2025

The health of a plant is entirely defined by its ability to respond to oxidative stress and to maintain an ...

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The Soil Electric

Crop protection

The Soil Electric

by Nigel Palmer

December 19, 2024

Plants control voltage (Eh) and acidity (pH) to thwart pathogens and insect pressure Electricity is ubiquitous, but it is often ...

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