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silky bag of the Pine Processionary, thaumetopoea pityocampa, well formed, in the crown of a pine, with the worms inside, to protect itself from the morning cold

A nest in a pine tree in the Taurus Mountains near Alanya, Turkey, bears the tell-tale signs of a Pine processionary moth infestation. The nest of Thaumetopoea pityocampa caterpillars can be seen on one of its branches, with defoliation and damage to the surrounding needles evident. Pine trees absorb water through their needles which helps them withstand arid conditions. These caterpillars are known for their toxicity, causing skin irritation and respiratory problems in humans and animals alike. As forest management techniques and climate change adaptation become increasingly important, the survival of ecosystems and biodiversity in the face of pests like the Pine processionary moth remains a crucial challenge

Pine processionary caterpillars are building their nest on a pine tree branch, posing a potential threat to the tree's health and surrounding environment

Bag or nest hanging from the branches infected with the pine processionary in winter - Saco o nido colgado de las ramas en pinos infectados con la procesionaria, en invierno

$Thaumetopoea pityocampa worms from Barcelona's pine trees. \n\nThe pine processionary is a real pest this year near Barcelona and all Catalonia.$

Pile of processionary caterpillars on the ground, Thaumetopoea pityocampa

Several nests are at the tip of several branches of a pine tree where the processionary caterpillars lay their nests during the months of February and March to proceed to break free leaving the insect pest.

Processionary caterpillar cocoon on a pine tree

Caterpillar web on tree at Albany Pine Bush Preserve, Albany, New York, USA

A close-up photograph of a pine tree branch infested with a pine processionary caterpillar nest (Thaumetopea pityocampa). The silky web nest is clearly visible among pine needles and cones, with a forest background. This image documents the environmental impact and spread of a dangerous forest pest, known for defoliating trees and causing allergic reactions in humans and animals.

Nests of the pine processionary caterpillar in woodland

Processionary spider web toxic for plants and men

Pine Processionary Moth (Thaumetopoea pityocampa) larvae feeding and nesting in an Aleppo pine tree (Pinus halepensis) near Freginals in the autonomous community of Catalonia, Spain

In the past, insects like these would have been controlled with pesticides, but today they are recognized as an important part of the ecosystem. This photo was taken at Amager Fælled, a popular nature area just 20 minutes from downtown Copenhagen, the capital of Denmark.

Cocoon of pine processionary caterpillars in a pine tree

Close-up view of a group of Ermine Moth caterpillars (genus Yponomeuta) clustered within their protective, intricate silken web on a branch of a European spindle tree (Euonymus europaeus). The image highlights the distinctive black spots on their bodies and the fine, almost translucent threads of their communal nest, with black frass (excrement) visible within the web.

Nests in pine trees in the Taurus Mountains near Alanya, Turkey (Turkiye), bears the tell-tale signs of a Pine processionary moth infestation. The nest of Thaumetopoea pityocampa caterpillars can be seen on one of its branches, with defoliation and damage to the surrounding needles evident. Pine trees absorb water through their needles which helps them withstand arid conditions. These caterpillars are known for their toxicity, causing skin irritation and respiratory problems in humans and animals alike. As forest management techniques and climate change adaptation become increasingly important, the survival of ecosystems and biodiversity in the face of pests like the Pine processionary moth remains a crucial challenge.

$Thaumetopoea pityocampa nest on Barcelona's pine tree. \n\nThe pine processionary is a real pest this winter near Barcelona.$

Pine processionary, Thaumetopoea pityocampa, use silk to create their nests in trees in warm Mediterranean climates.

Close-up of an alpine plant affected by Thaumetopoea pityocampa

Forest pests. Nest of butterflies (Pine Processionary Caterpillar, Thaumetopoea pityocampa), made by caterpillars. Mediterranean Turkey, April

Bag or nest hanging from the branches infected with the pine processionary in spring - Saco o nido colgado de las ramas en pinos infectados con la procesionaria, en primavera

Pine processionary larvae nest (Thaumetopoea pityocampa)

$The pine processionary (Thaumetopoea pityocampa) is a moth of the subfamily Thaumetopoeinae in the family Notodontidae, known for the irritating hairs of its caterpillars, their processions, and the economic damage they cause in coniferous forests. The species was first described scientifically by Michael Denis and Ignaz Schiffermüller in 1775, though it was known to the ancients, with remedies described by Theophrastus, Dioscorides and Pliny the Elder. Its processionary behaviour was described in 1916 by the French entomologist Jean-Henri Fabre. It is one of the most destructive species to pines and cedars in Central Asia, North Africa and southern Europe.\n\nThe species is notable for the behaviour of its caterpillars, which overwinter in tent-like nests high in pine trees, and which proceed through the woods in nose-to-tail columns, protected from predators by their severely irritating hairs.\n\nThe species is one of the few insects where the larva develops in winter in temperate zones. Global warming is causing the species to affect forests progressively further north.[1] The urticating hairs of the caterpillar larvae cause harmful (and in some cases allergic) reactions, in humans and other mammals.\nDistribution:\nThe species is native to the southern Mediterranean area, North Africa, the Middle East, and southern Europe. It has been spreading northwards since the 1990s, assisted by climate change and by commercial activities including planting of host trees and transportation, and has reached Brittany, forests to the north of Paris, and Strasbourg in northern France (Wikipedia). \n\nTrough the Global Warming the Species has reached the South of the Netherlands (Brabant and Limburg).$

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