new icn messageflickr-free-ic3d pan white
Pear Rust (Gymnosporangium sabinae) | by Martin Cooper Ipswich
Back to photostream

Pear Rust (Gymnosporangium sabinae)

This is Gymnosporangium sabinae, a rust fungus, found on a Pear tree in Christchurch Park (TM16464519) on 24 October 2015. ID confirmed by Keith Palmer of the British Plant Gall Society. It has a remarkable life-cycle. The fungus causes red-orange spots on the upper surface of infected leaves of Pear trees (top picture). Swellings grow on the other sides of the leaves (bottom picture) which release another type of spore. These cannot re-infect Pear trees, but can cause a perennial fungal infection in Juniper bushes. An infected Juniper produces spores each spring. These spores infect Pear trees and complete the cycle.

1,421 views
11 faves
11 comments
Taken on October 24, 2015