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Extreme spring weather – a sign of climate change?

In the UK this year there was a warm spell of weather in April which encouraged bud burst in quite a number of oak trees. In May we had some couple of consecutive nights of frost, which resulted in shrivelling… 

Armillaria – a maverick fungus and the damage it can cause

In the UK we have also noticed very severe external Armillaria symptoms on oak trees (Quercus robur). The causal species is Armillaria gallica. In the gallery below the first two images show an old, blackened lesion spreading up the stem…