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È una minaccia piccola ma seria quella che inquieta i contadini svizzeri. Si tratta dell'arvicola, più comunemente nota come topo campagnolo, che sta colonizzando i campi. Un'invasione che in parecchi casi è già troppo massiccia per essere fermata.
Nell'80% dei terreni analizzati dall'istituto federale di ricerca agricola Agroscope è aumentata la presenza dei roditori rispetto all'anno scorso. Un dato riportato venerdì dal sito svizzero dedicato all'agricoltura. L'aumento riguarda tutto il paese e nella maggior parte dei siti osservati è stata oltrepassata la soglia critica dei 40 topi per ettaro. Ognuno di essi sgranocchia circa 150 grammi di radici al giorno, minacciando dunque non solamente la produzione foraggera ma anche gli alberi.
L'esplosione del numero di topolini è legata alle clementi temperature del 2017.
ATS/CaL
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