Emergency Popilia (8)
|SEE WS TOO!|
I had already talked about this problem last year, but in this early summer, the invasion of Popilia japonica in the Ticino Park is truly devastating. An emergency in front of this insect appeared in recent years, probably arrived from China in wooden pallets that are unloaded at Malpensa airport. This insect eats everything and has no natural enemy in this area, the authorities have put thousands of traps but the situation does not seem to have a solution, in the WS you can see one of the many traps that are emptied daily.
The beetle species Popillia japonica is commonly known as the Japanese beetle. It is about 15 millimetres (0.6 in) long and 10 millimetres (0.4 in) wide, with iridescent copper-colored elytra and green thorax and head. It is not very destructive in Japan, where it is controlled by natural predators, but in North America it is a serious pest of about 200 species of plants, including rose bushes, grapes, hops, canna, crape myrtles, birch trees, linden trees and others.
It is a clumsy flier, dropping several centimeters when it hits a wall. Japanese beetle traps therefore consist of a pair of crossed walls with a bag or plastic container underneath, and are baited with floral scent, pheromone, or both. However, studies conducted at the University of Kentucky and Eastern Illinois University suggest beetles attracted to traps frequently do not end up in the traps, but alight on plants in the vicinity, thus causing more damage along the flight path of the beetles and near the trap than may have occurred if the trap were not present.
These insects damage plants by skeletonizing the foliage, that is, consuming only the leaf material between the veins, and may also feed on fruit on the plants if present.
As the name suggests, the Japanese beetle is native to Japan. The insect was first found in the United States in 1916 in a nursery near Riverton, New Jersey.It is thought the beetle larvae entered the United States in a shipment of iris bulbs prior to 1912, when inspections of commodities entering the country began. "The first Japanese beetle found in Canada was in a tourist's car at Yarmouth, arriving in Nova Scotia by ferry from Maine in 1939. During the same year, three additional adults were captured at Yarmouth and three at Lacolle in southern Quebec.
Japanese beetles have been found in the islands of the Azores since the 1970s.In 2014 the first population in mainland Europe was discovered near Milan in Italy.
The life cycle of the Japanese beetle is typically one year in most parts of the United States, but this can be extended in cooler climates; for instance, in its native Japan, the beetle's life cycle is two years long as a result of the higher latitudes of the grasslands required for the larval stage. During the larval stage, the white grubs can be identified by their V-shaped raster pattern.
Avevo già parlato di questo problema lo scorso anno, ma in questo inizio d'estate, l'invasione della Popilia japonica nel Parco del Ticino è davvero devastante. Una emergenza di fronte a questo insetto comparso negli ultimi anni, probabilmente arrivato dalla Cina nei pallet di legno che vengono scaricati all'aeroporto di Malpensa. Questo insetto mangia ogni cosa e non ha nessun nemico naturale in questa zona, le autorità hanno messo migliaia di trappole ma la situazione non sembra avere una soluzione,nel WS potete vedere una delle tante trappole che vengono svuotate quotidianamente.