However,
Damage caused insects larches pines:
Keystone-SDA
Two species of so far rather discreet insects have caused significant damage to forest trees this summer in Switzerland. Nevertheless, The Swiss forest protection service of the WSL Institute prays the public to report any additional observation. Moreover, – Damage caused insects larches pines
(Keystone-ATS) In the SaaS valley and in the Conches valley (VS), the foresters have observed since the beginning of June yellowing and losing the needles of the larch. Some trees were completely defolved. the Federal Institute for damage caused insects larches pines Research on Forest, Snow and the Landscape (WSL) said on Wednesday in a press release.
These symptoms are caused by the caterpillars of an native butterfly. the orange hibernia (Agriopis Aurantiaria), which also attacks other essences. Until now, massive proliferations of this species have been observed only rarely.
“Recent climatic conditions have clearly favored strong population growth. leads to this significant damage,” writes the WSL Swiss forest (WSS) protection service in its bulletin. Meanwhile, the affected trees have reacted by producing a second boning.
Report suspicious cases
About the same period, the WSS received damage reports in the Roman Jurassian arch. In several places, sylvestre pines and black pines had a significant discoloration of the needles.
The manager is the lecudelle of the pines (Haematoloma Dorsata), recognizable by its annular sucking traces on the needles. “Originally from the more southern regions of Europe. this species has extended its range to the north in recent damage caused insects larches pines decades,” writes the protection of the Swiss forest.
Isolated cases of this species have been reported in Switzerland for several years. but so far, no serious damage to the needles had been found in our country.
The WSS wishes to identify the extent of the damage caused by these two species throughout Switzerland. He therefore asked to report any suspicious case using the form provided for this purpose.
https://waldschutz.wsl.ch/fr/diagnostic-et-conseil/formulaire-de-conseil-et-de-signalement-pour-les-maladies-et-ravageurs-des-arbres/
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