Food and Biological Security: Agricultural Fungicide

Baroness Walmsley Excerpts

Thursday 23rd November 2023 Grand Committee

[Baroness Walmsley (LD)]

My Lords, I thank the noble Baroness, Lady Bennett of Manor Castle, for introducing this important but niche subject. As a botanist, I have always felt that fungi are often underestimated and largely ignored, yet they play a major role in the natural environment, in particular in the soil ecosystem, where they break down organic matter and make it available to plant roots through the miles of mycelium under our feet. Without the fungi in a healthy soil, our crops would fail and our food security would be affected. However, as we heard from the noble Baroness, some fungi are regarded as pests that infect food crops and reduce the harvest, or even make the food inedible. The challenge is to control the one without damaging the other or, indeed, insect pollinators and our wild bird population.

The major tool for the challenge of these fungal pests is fungicides, controlled by our plant protection products—PPP—regime, now independent since the UK left the European Union. I am glad to say that it is true that the use of fungicides has fallen in recent years, partly because of more sensible and economical use of fungicides—what farmer does not want to save money on unnecessary spraying?—and partly through the development of resistant varieties of crops, in particular wheat, barley and oilseed rape.

What support are the Government providing for research to develop disease-resistant varieties of crops? What damage has been done to such projects since the Government’s protracted negotiation about joining the EU Horizon scheme, from which UK scientific research benefited so much for so many years?

I do not deny that there is a role for minimal pesticide use if we are to feed our country as much as possible from our own limited land area, on which there is so much pressure, and I look forward to the Government’s long-awaited land use strategy. However, there are other ways of skinning the cat, and sustainable farming methods can be just as productive and better for our damaged biodiversity. Practices that protect soil health and pollinators will give just as much benefit as widespread use of pesticides of all kinds, if not more, and still give farmers a living.

However, the briefing we received from CropLife UK, which made the case for the controlled and legal use of pesticides, noted that:

“The UK has one of the most rigorous regulatory regimes for PPPs in the world. Active substances and products must be safe for the environment and pose no unacceptable risks to human health”.


I underline that last phrase.

This brings us to the point of the noble Baroness’s debate today, for she and the British Society for Antimicrobial Chemotherapy, which also briefed us, believe that we are in danger of just such a risk unless action is taken. The same fungi that affect crops can also affect humans, as she said, and are very dangerous to the most vulnerable patients. Nature is endlessly inventive, and clever fungi have developed resistance to the fungicides that farmers commonly use. But the researchers in bioscience are also very clever, and have developed a very effective treatment for humans. There is also a new treatment, developed by the University of Manchester, which is effective against the new antimicrobial-resistant strains of fungi when they affect humans.

So far, so good. However, a new product approved by the FDA in the US has now been developed for agricultural use and is effective against the antimicrobial-resistant strains of Aspergillus in the field—I will not try to pronounce the name, as the noble Baroness has already done so. You can therefore see the attraction to farmers. Yet there is a risk to human health because it uses, as the noble Baroness said, the same molecular mechanism as the effective human treatment. Scientists believe that, if it came into general use, it would both stimulate the development of more resistant strains of fungus in the field and jeopardise the effectiveness of the new treatment currently undergoing clinal trials.

I therefore support the noble Baroness, Lady Bennett of Manor Castle, in asking for a pause and a risk assessment before this product is licensed for use in the UK. If we do not do this, we will be constantly chasing our tails as nature develops resistance to our chemicals, and we then have to develop more and more chemicals to protect humans. Nature will always win in the end. That is why I support the further implementation of low-pesticide agricultural practices to protect our soils and reduce environmental selective pressure, which undoubtedly leads to more resistant strains emerging. Can the Minister therefore outline the environmental land management payments that are relevant to this sort of agricultural practice? Can he also say how successful uptake has been among farmers of all sizes, including tenant farmers?