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Melampsora laricis-populina

Pappelrost

Description

Towards the end of summer and in autumn, on white poplar (Populus alba) leaves are formed telia and in them teliospores. Rust at this stage overwinters on shed leaves. In spring, teliospores germinate and form basidiospores that infect larch needles. Then, spermatogonia and small stacks of orange deposits - aecia - are formed on needles. Aeciospores infect poplar leaves, where firstly are formed yellowish orange uredinia which can repeatedly infect poplar leaves in the course of summer. Later, winter spores, teliospores, are formed on leaves in dark brown to black deposits of spores - telia. Aspen leaves (P. tremula) are attacked by similar rust M. populnea. Disease on larches is not of a practical significance.

Symptom

Rusty dots on both sides of the leaves.

Tree Species: Larch, Poplar

Part of a plant- attacked: Leaf / Needle

Pest significance: Harmful

Pest Category: Fungi

Invasive Species: No

Present in EU: Yes

Seasonal frequency of occurrence

Seasonal frequency of occurrence