Delicate bokeh
Highlight of the May Species Count
Colour in between brown owls and green leaves
Fledgling fluffball
A change from on a fence post
Working hard to put food on the table
A cooperative youngster
Baltimore Oriole
Petals and sepals
King of the road
Blue-winged Teal
Western Tanager
The gang
Smooth Blue Beardtongue
Mountain Bluebird nest
Keeping a watchful eye
Striped Coralroot / Corallorhiza striata
A mother's love
Butterfly on orchid
Ruddy Duck
Wildflowers of spring
"Milk - it does a body good"
Watching and listening
Sweet embrace
Sunny side up
Busy excavating
Moth of Alberta
Colour for a rainy day
Gray Jay
Little train in a big landscape
Columbian Ground Squirrel
Beautiful mix of colours
Lake Minnewanka, near Banff
Momma Great Horned Owl
Spring really is here
An Otter - what a surprise sighting!
In beautiful surroundings
A bright start to any day
Yellow-bellied Sapsucker at work
European Pasque Flower
Out of luck
Staying close to Mom
Eye contact with the wise old owl
A splash of colour on a dreary day
Who am I?
Authorizations, license
-
Visible by: Everyone -
All rights reserved
-
151 visits
Cedar Apple Rust Fungus on Juniper


We saw this Cedar Apple Rust on Juniper when we did a three-hour walk on the Upper Plateau at Edworthy Park on May 23rd. In a few places, it had formed beautiful "rosettes" like this one.
"Cedar apple rust, which is caused by the fungus Gymnosporangium, needs juniper plants and certain Rose family plants (such as saskatoons, hawthorns, and in some cases, apples) to complete its life cycle. On junipers, the disease appears as woody, spherical galls. In the spring (early May), brown, horn-like projections called "telia" grow out of the woody galls. During wet weather, the telia absorb water, swell up immensely, and become orange and gelatinous. At this stage the disease emits spores that infect the Rose family plants to cause the bright orange spots. The orange spots will eventually produce their own horn-like structures called "aecia" on the fruit and underside of the leaves; from the aecia, spores are produced that re-infect the junipers in the late summer. The disease must pass from junipers to Rose family plants to junipers again; it cannot spread between Rose family plants."
gardenline.usask.ca/fruit/rust.html
"Cedar apple rust, which is caused by the fungus Gymnosporangium, needs juniper plants and certain Rose family plants (such as saskatoons, hawthorns, and in some cases, apples) to complete its life cycle. On junipers, the disease appears as woody, spherical galls. In the spring (early May), brown, horn-like projections called "telia" grow out of the woody galls. During wet weather, the telia absorb water, swell up immensely, and become orange and gelatinous. At this stage the disease emits spores that infect the Rose family plants to cause the bright orange spots. The orange spots will eventually produce their own horn-like structures called "aecia" on the fruit and underside of the leaves; from the aecia, spores are produced that re-infect the junipers in the late summer. The disease must pass from junipers to Rose family plants to junipers again; it cannot spread between Rose family plants."
gardenline.usask.ca/fruit/rust.html
- Keyboard shortcuts:
Jump to top
RSS feed- Latest comments - Subscribe to the comment feeds of this photo
- ipernity © 2007-2025
- Help & Contact
|
Club news
|
About ipernity
|
History |
ipernity Club & Prices |
Guide of good conduct
Donate | Group guidelines | Privacy policy | Terms of use | Statutes | In memoria -
Facebook
Twitter
Sign-in to write a comment.