Their numbers fuelled by rising temperatures, the pests have damaged nearly 15,000 hectares (37,000 acres) of grazing land in the central province of Nuoro, said Michele Arbau, of the Sardinia branch of Italian agricultural association Coldiretti.
“Farmers have lost the summer pasture and partly the fodder for autumn and winter… and the very few people who grew barley had to give that up too,” he told the Thomson Reuters Foundation.
During the summer months, locusts are a common phenomenon on the Mediterranean island of Sardinia – known for its idyllic beaches and exclusive resorts – but this year’s outbreak has been much larger than normal.
Last year, the pests destroyed about 2,500 hectares in what was then described as the worst outbreak since the end of World War Two.
More extreme weather driven by climate change can affect the development and spread of insect infestations, including locusts, according to Ignazio Floris, a professor of entomology at the University of Sassari in northwest Sardinia.
Rising temperatures can cause longer dry periods, leading soils to become arid and unplanted, which creates ideal conditions for insects that like laying their eggs in dry, untilled soil, he said.
More frequent extreme weather swings – including drought in 2017, too much rain in 2018 and both extremes last year in Sardinia – also seem to be spurring bigger locust invasions, said Coldiretti’s Arbau.
More idle farmland on the island also is a factor, with more farmers leaving land unplanted because they can no longer sell their harvest at a profit, Arbau said.
The locust invasion adds to Italy’s woes.
The country was the first in Europe to be badly hit by the coronavirus and it is still recovering from the pandemic, which has killed more than 34,000 people – the fourth highest death rate in the world – and infected nearly 240,000.
During a nationwide lockdown in March and April, Italian farmers also had to grapple with a shortage of farm workers and a cold snap that destroyed vast swathes of fruit.
The latest threat comes from Moroccan locusts, a species native to southern Europe including Sardinia. The pests are different from the desert locusts wreaking havoc in East Africa.
Key to limiting their destruction is early monitoring, with eggs laid in the soil “easily eliminated by surface tillage where possible”, said entomologist Floris.
Once the insects reached adult stage, however – as at present – there is very little that can be done to control them, said Alexandre Latchininsky, a locust expert with the United Nations’ Food and Agriculture Organization (FAO).
But farmers can prepare for next year by applying an ecologically-safe, fungus-based pesticide, he said.
“I suggest farmers’ organisations consider this biocontrol option for next year, when they will undoubtedly face the Moroccan locust problem again,” he said.
Reporting By Thin Lei Win @thinink, Editing by Laurie Goering Please credit the Thomson Reuters Foundation, the charitable arm of Thomson Reuters, that covers the lives of people around the world who struggle to live freely or fairly. Visit http://news.trust.org