A yellow plastic is wrapped around a chestnut tree to contain caterpillars in Westmalle, Belgium, Thursday, Aug. 23, 2012. The great chestnut trees of Europe are dying. Without any clear reason, a moth became rampant and spread through much of Europe about a decade ago. In Britain, it first surfaced in Wimbledon in 2002 and soon spread across England and Wales. Look at the annual distribution maps since, and they could come straight out of a movie about the outbreak of a scary virus. The moth lays eggs in the leaves and later the larvae start devouring them, shriveling leaves as soon as July. (AP Photo/Virginia Mayo)

Associated Press
A yellow plastic is wrapped around a chestnut tree to contain caterpillars in Westmalle, Belgium, Thursday, Aug. 23, 2012. The great chestnut trees of Europe are dying. Without any clear reason, a moth became rampant and spread through much of Europe about a decade ago. In Britain, it first surfaced in Wimbledon in 2002 and soon spread across England and Wales. Look at the annual distribution maps since, and they could come straight out of a movie about the outbreak of a scary virus. The moth lays eggs in the leaves and later the larvae start devouring them, shriveling leaves as soon as July. (AP Photo/Virginia Mayo)
A yellow plastic is wrapped around a chestnut tree to contain caterpillars in Westmalle, Belgium, Thursday, Aug. 23, 2012. The great chestnut trees of Europe are dying. Without any clear reason, a moth became rampant and spread through much of Europe about a decade ago. In Britain, it first surfaced in Wimbledon in 2002 and soon spread across England and Wales. Look at the annual distribution maps since, and they could come straight out of a movie about the outbreak of a scary virus. The moth lays eggs in the leaves and later the larvae start devouring them, shriveling leaves as soon as July. (AP Photo/Virginia Mayo)
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