Acute Oak Decline in the UK – Part 1

29 04 2010

Acute Oak Decline (photo from BBC)

Yesterday the BBC ran a story on Acute Oak Decline in the UK titled “Oak disease threatens landscape”. The lead in to the article states –

“The continuing spread of a deadly disease that affects the UK’s native oak trees is causing concern among tree professionals and conservation groups.”

The article goes on to describe the problem as Acute Oak Decline (AOD), which is caused by a bacterial infection that can “kill an infected tree in just a few years.”

Further down in the article is the following alarm –

“I have never seen anything like it,” said Peter Goodwin, co-founder of Woodland Heritage.

“Its spread over the last two years has been quite alarming.”

And –

“We’ve never had a bacterium that is capable of doing what this one is doing.”

In the words of Yogi Bera, “It’s like deja vu all over again”.

When similar alarms were being raised about Sudden Oak Death in the early 2000’s, the plant pathologists were able to muster up many millions of dollars in taxpayer money all to study a single disease-causing organism, Phytophthora ramorum. If you didn’t buy into their disease model then you simply didn’t get funded. Believe me, I tried – three times.

My concern with the hype around Sudden Oak Death, as it is with Acute Oak Decline, is that the role of ecology in predisposing oaks to disease is not being adequately addressed.

In the case of Acute Oak Decline, I suspect that there may be problems with the fertility of the soils that are predisposing the oaks to infection. Given the good results we’re getting here in California by adding mineral fertilizers to soils around oaks infected with Sudden Oak Death, it would be wise for the scientists studying Acute Oak Decline to pay close attention to the soil ecology.

In Part 2 of this post I will present and discuss some soil chemistry results obtained in February 2009 from an area around English oaks with Acute Oak Decline in the Royal Parks of London.

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