Hey pesto!: the popular green source is commonly used in pasta dishes / Getty Images

Survival of pine forest ecosystems threatened by 'unsustainable' nut harvests in many regions

Italian restaurateurs and gourmets have reacted with horror to a call for a key ingredient to be removed from one of Italy’s most popular recipes because it is damaging the environment.

The culinary villain is pesto – and its suspect ingredient is the pine nut. According to Jonathan Slaght, a leading figure in the US-based Wildlife Conservation Society and a forestry expert, the insatiable international appetite for the tasty green sauce, which millions of people eat with pasta every day, is threatening the survival of pine forests.

Those in Russia are in particular danger as the rising global demand for pesto has prompted “unsustainable” nut harvests in many regions. “The entire Korean pine ecosystem could collapse if it continues,” he said, noting that many animals from birds, chipmunks and red deer to wild boar and Asiatic black bears depend on the calorie- and protein-rich nuts to survive harsh winters.


Stone pines in La Pineta Sacchetti park in Rome. Forests in Russia and Korea are said to be in danger (Alamy)

In an article in the New York Times, he said a shortage of pine nuts may have contributed to recent incidents of hungry bears roaming the streets and attacking residents in Luchegorsk, a Russian town near the Chinese border.

Paolo Nano, a spokeswoman for Slow Food, an Italian-based sustainable eating movement, said if nuts were sourced locally it would be possible to stick to the recipe without damaging the environment. “It doesn’t make sense exporting tons from the Far East,” she said. 

Mr Slaght had another suggestion: “For those who feel that it’s the combination of roasted nuts and fresh basil that gives pesto its unique flavour and texture, walnuts, cashews, pistachios and even almonds are all palate-pleasing alternatives.” 

Walnuts, cashews, pistachios and even almonds are all palate-pleasing alternatives

Forestry expert, Jonathan Slaght

This got short shrift, however, from a celebrated restaurant owner in Genoa, the Italian port that gave the world pesto alla Genovese, the rich blend of crushed garlic, basil and pine nuts blended with salt and olive oil. Luciano Belloni, owner of the Zeffirino restaurant, who used to send fresh pesto to Frank Sinatra’s Ligurian mother and who has made it for Pope Francis, said other nuts won’t do. 

“Lots of people substitute peanuts. The pine nut is expensive and we pay €60 [£44] a kilo for those from Versilia. But if you want to make pesto, this is the recipe.” Otherwise, he told La Repubblica, “the quality fails”.

Mr Belloni revealed that the Russian President, Vladimir Putin, had now fallen under the spell of his pesto. “He wanted some in the Moscow restaurant where he usually eats,” he said. In return, he added, “he sent me a bottle of his vodka”.