Conkers on horse chestnut trees threatened by moth pest By Emma Brennand Earth News reporter

Could conker championships become a thing of the past?

A common insect called the leaf miner moth does more long-term damage to horse chestnut trees than thought.

Previously the moth was thought to cause only cosmetic damage, but a study published in the journal Urban Forestry & Urban Greening shows the moth larvae attack the tree's leaves, reducing their ability to capture sunlight and turn it into food.
This loss in ability to produce energy, dramatically reduces seed size and quality, potentially stunting the tree's growth.
The horse chestnut tree was first introduced to the UK in the 1600s.
Its white flowers are now a common sight in UK towns, cities, parks and woodlands.
However, over the past eight years, this tree has been under attack by the leaf miner moth Cameraria ohridella.
"Infected leaves are covered initially in small, brown patches which spread rapidly across the entire tree," explains Dr Glynn Percival from the University of Reading, UK.
"Eventually leaves die and fall prematurely."
This new study shows that the damage may be long-term, effecting the tree's growth and reproduction.
Light-weight conkers
The researchers report that the average seed weight, germination and growth rates decreases by up to 48% in trees showing infestation.
And conker weights are halved in trees that show a very large amount of leaf damage.
The team also observed decreases in stem growth, and in levels of sugars and starch in roots and twigs.

Posted in: sci.envairment