Puccinia graminis

Stem rust

Description

Puccinia graminis is a fungal pathogen that causes significant damage to various species of Berberis spp., commonly known as barberry. This plant pathogen is responsible for a disease called stem rust, which can have severe consequences for the affected plants. When Puccinia graminis infects Berberis spp., it causes characteristic symptoms such as orange to reddish-brown pustules or rust-colored lesions on the stems, leaves, and sometimes even the fruits of the plants. These pustules contain spores that can spread and infect nearby plants, leading to further infestation and damage. The presence of Puccinia graminis can weaken the affected Berberis plants, resulting in stunted growth, reduced vigor, and overall decline in plant health. Severe infections can lead to defoliation, which affects the plant\'s ability to carry out photosynthesis and lower its overall productivity.In addition to the direct damage caused by the pathogen on Berberis, Puccinia graminis plays a crucial role in the disease cycle of stem rust. It acts as an alternate host for the rust fungus that primarily affects cereal crops, particularly wheat and barley. Barberry serves as a bridge between the life cycles of the fungus, allowing it to survive and spread, posing a significant threat to agricultural crops.

Symptom

When Puccinia graminis infects Berberis spp., it causes characteristic symptoms such as orange to reddish-brown pustules or rust-colored lesions on the stems, leaves, and sometimes even the fruits of the plants.

Tree Species: Barberry, Mahonia

Part of a plant- attacked: Tree trunk, Leaf / Needle, Fruit / Seed, Branch

Pest significance: Harmful

Pest Category: Fungi

Invasive Species: No

Present in EU: Yes