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Graellsia isabellae

Spanish moon moth

Description

Graellsia isabellae, also known as the Spanish moon moth, is a species of moth in the family Saturniidae. While its larvae primarily feed on coniferous trees, including Pinus species (especially Pinus sylvestris), it is not generally considered a pest. The moth is more notable for its beauty than for causing significant damage to pine forests. This moth species has one generation per year (univoltine). The adult moths typically emerge in late spring, around May or June. The eggs are small and round, usually laid singly or in small groups on the needles of Pinus species. The caterpillars start off small and green, with distinctive white markings along their sides. As they grow, they develop more pronounced colors and patterns, including a greenish body with light and dark stripes. Pupation takes place in autumn in the soil. Pupa overwinters. In localized areas, if populations of Graellsia isabellae are high, their larvae could cause some small defoliation of pine trees, but this typically doesn’t reach a level where they are considered a significant pest. Conservation efforts are often more focused on protecting this species, as it is considered vulnerable or rare in certain regions of its range, particularly in Spain and France.

Symptom

Large larvae feeding on needles. Some needles are missing on the twigs.

Tree Species: Pine

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes