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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

Processionary caterpillar cocoon on a pine tree

Processionary spider web toxic for plants and men

In another phase or stage of growth of the Pine Processionary, thaumetopoea pityocampa, in which the caterpillar becomes larger, with which it eats more and the pines are left without needles, a large bush with worms inside and outside

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

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

$Malacosoma castrense (or Malacosoma castrensis), the ground lackey, is a moth of the family Lasiocampidae. It is a tent caterpillar found in Europe.\nThe length of the forewings is 13–16 mm for males and 17–21 mm for females. The moth flies from June to August, depending on the location.\nThe caterpillars feed on various shrubs and herbaceous plants such as heather, cypress spurge, and Lotus species (source Wikipedia).\n\nThis is a quite common Species in the Netherlands in Heathland Habitat.$

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

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

Thaumetopoea pityocampa nest in the pine

Nests of processionary caterpillars on pine trees in winter that, due to the high temperatures, the worms themselves can be seen.

Pile of processionary caterpillars on the ground, Thaumetopoea pityocampa

Cocoon of pine processionary caterpillars in a pine tree

Stone Pine with a nest of Processionary Caterpillars

Processionary nest on a Maritime Pine branch

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.

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

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.

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

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.

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.

a pine tree branch shows a large webbed structure created by processionary caterpillars, surrounded by cones and needles in natural daylight

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