Their voracity led them to be described as the scourge of Castile. They devastated a total of 500,000 hectares of crops and caused losses of 15 million euros. In normal years, their population did not exceed 100 million, but in the summer of 2007, it is estimated that they reached at least 700 million. This Eurasian species had only penetrated the Iberian Peninsula as far as the Cantabrian Mountains, where it differentiated and became a subspecies called Microtus arvalis asturianus, beginning to extend its habitat to the south, thus freeing itself from its natural predators, the birds of prey. The common vole ( Microtus arvalis) was responsible for devastating the crops of the northern plateau. However, there was an abundance of voles during the following months, being only the winter frosts and the low temperatures of November and December which helped to put an end to the situation. In September 2007, after a summer of severe losses, the density of rodents decreased throughout the community and the plague was institutionally considered to be over. The plague became relevant from the summer of 2007 onwards when crops in the plateau fields were devastated by these rodents, which put special emphasis on irrigated crops.
The 2007 vole plague began to develop at the beginning of the summer of 2006 in the Spanish autonomous community of Castile and León, more specifically in the province of Palencia. Voles in action in the town of Campaspero, Valladolid, which although it has not been one of the most affected, has also felt the effects of the plague. ( Learn how and when to remove this template message) ( January 2023) ( Learn how and when to remove this template message)
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