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Home | Features | Insect Invaders Threaten Romes Pines

Insect invaders threaten Rome’s pines

Toumeyella parvicornis operates like a little vampire, sucking with its syringe-like mouth the sap from the tree's needles and bark

By AFP
Published Date - 07:51 PM, Sun - 6 December 20
Insect invaders threaten Rome’s pines
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Rome: Rome’s majestic umbrella pines are as much part of the landscape as the ruins and cobbled streets, but they are under threat from a tiny insect invader – the pine tortoise scale. “If we do nothing, the pines of Rome will be destroyed by the thousands,” warned agronomist Franco Milito, who estimates there are around 60,000 such trees in the city’s public areas and another 30,000 on private land. “And they are really the trees of Rome, which shape the views. We must look after them.”

The insects, originally from North America, can kill trees already weakened by the urban environment within just two or three years, experts said. “It’s very serious,” said Patrizio Zucca, head of the association of agronomists in Rome. “Urgent action is needed.”

Toumeyella parvicornis, to give it its Latin name, is about three millimetres long, and its reddish-brown oval shell resembles a tortoise. It was unknown in Italy until five years ago, but after ravaging the stone pines of Naples in the south, it has moved up the coast. The insect operates like a little vampire, sucking with its syringe-like mouth the sap from both the tree’s needles and its bark. It produces a sweet white excrement, on which thick black mould develops, covering the tree and blocking the process of photosynthesis.

In Campania, the southern region that includes Naples, although many pines succumbed, others resisted. “If, with climate change, temperatures rise in the summer, the scales will suffer a lot,” he said. The area once boasted a glorious park of 1,200 pines, opened in 1931 by the Fascist leader Benito Mussolini. He also planted pines across Rome, making them so much a symbol of Italy that they became known not by their Latin name “pinus pinea” but as “pino italico”. But “out of around 10,000 pines in Naples, at least half are dead”, Topa said.

Authorities in Lazio, the region that includes Rome, are urgently seeking a solution. One option is to inject chemicals into the trunk of each tree, but it is expensive and was effective only 20 to 30 percent of the time. And many products cannot be sprayed directly on trees in urban areas for public health reasons. “The only solution will be to use natural predators, but a study will take time.”

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