• 45°

Darrell Blackwelder: Cedar apple rust

I got an email last week with a couple of photos about cedar trees. The trees had some kind of orange slimy growth and the person was afraid it was going to kill the trees. The cedars are 25 years old and never had this problem. The problem in the email is cedar apple rust Gymnosporangium juniperi-virginianae. It’s a fungal disease of both cedars (junipers) and apple trees. It is an uncommon fungal disease that requires two alternate hosts to complete its lifecycle. Ironically, the fungi must thrive on two entirely different types of plants to complete its lifecycle.

Brown galls about the size of a golf ball are within the cedars during the winter months. After warm spring rains, the galls swell producing gelatinous orange-colored horns with infectious spores. These spores are transmitted to nearby apple tree leaves up to three miles away. These spores then emerge as orange splotches later on the undersides of the apple leaves completing the cedar apple rust fungus lifecycle. The orange gel may also infect limbs and trunks. This fungus requires two years to complete this rather complex lifecycle.

Cedar apple rust does little harm to cedars or junipers. Apple leaves will become pale and fall off the tree. Many apple cultivars are resistant to cedar apple rust. Fungicidal sprays may help, but the disease usually does not kill either tree. For more detailed information on cedar apple rust go to https://content.ces.ncsu.edu/cedar-apple-rusts .

Darrell Blackwelder deblackw@ncsu.edu is the retired horticulture agent and director with the North Carolina Cooperative Extension Service in Rowan County.

Comments

Business

Weak jobs report spurs questions about big fed spending

News

Judge limits footage that family can see of deputy shooting in Elizabeth City

Sports

Woodland, two others share lead; Mickelson plays much worse but will still be around for weekend at Quail Hollow

Business

Former NHL player to open mobster themed bar in Raleigh

Nation/World

California population declines for first time

News

GOP leaders differ on bottom line for state spending

News

Police: Man killed in shootout with officers in Winston-Salem

Crime

Man charged after thieves rob would-be gun buyers of wallets, shoes

Crime

Blotter: Four added to sheriff’s most wanted list

High School

High school football: Some anxious moments, but Hornets win state title

Local

Photos: Salisbury High Hornets win big in 2AA championship game

Local

County manager outlines projections for the upcoming fiscal year budget, suggests uses for stimulus money

Business

Miami-based Browns Athletic Apparel opens second screen printing location in Salisbury

News

At funeral, fallen Watauga deputies remembered as ‘heroes’

Coronavirus

COVID-19 cluster identified at Granite Quarry Elementary

Coronavirus

More than half of North Carolinians have now taken at least one vaccine shot

Local

City hopes to cover expenses in 2021-22 budget with surplus revenue generated this year

Local

Fallen tree proves to be a blessing for local nonprofit Happy Roots

Local

Quotes of the week

Coronavirus

Health department drops quarantine time from 14 to 10 days

Crime

Blotter: More than $100,000 in property reported stolen from Old Beatty Ford Road site

Local

City fights invasive beetles by injecting trees with insecticide

Local

City names downtown recipients for federal Parks Service grant

China Grove

China Grove Town Council weighs 2021-22 budget priorities, supports buying body cameras