A cloud of chemicals has been sprayed over parts of Berkshire today to halt the spread of a toxic caterpillar. The Oak Processionary Moth destroys trees and causes severe itching and rashes in humans and animals.
The area affected - is in Sulham Woods in Pangbourne near Reading. Two spots were sprayed today, but the operation has been delayed a number of times this year, because of the weather.
However, the use of chemicals has concerned environmental groups - who say other creatures, not just the caterpillars and moths, will be harmed. Cary Johnston reports.
Additional footage supplied by Tony Duckett
Additional still provided by Henry Kuppen
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There is a high risk from birch pollen during any good weather. Oak pollen is also on the increase.
Wednesday's weather for the west of the region
Wednesday's weather for the east of the region