Pick up know-how for tackling diseases, pests and weeds.
Farm bill, farm marketing, agribusiness webinars, & farm policy.
Find tactics for healthy livestock and sound forages.
Scheduling and methods of irrigation.
Explore our Extension locations around the state.
Commercial row crop production in Arkansas.
Agriculture weed management resources.
Use virtual and real tools to improve critical calculations for farms and ranches.
Learn to ID forages and more.
Explore our research locations around the state.
Get the latest research results from our county agents.
Our programs include aquaculture, diagnostics, and energy conservation.
Keep our food, fiber and fuel supplies safe from disaster.
Private, Commercial & Non-commercial training and education.
Specialty crops including turfgrass, vegetables, fruits, and ornamentals.
Find educational resources and get youth engaged in agriculture.
Gaining garden smarts and sharing skills.
Creating beauty in and around the home.
Maintenance calendar, and best practices.
Coaxing the best produce from asparagus to zucchini.
What’s wrong with my plants? The clinic can help.
Featured trees, vines, shrubs and flowers.
Ask our experts plant, animal, or insect questions.
Enjoying the sweet fruits of your labor.
Herbs, native plants, & reference desk QA.
Growing together from youth to maturity.
Crapemyrtles, hydrangeas, hort glossary, and weed ID databases.
Get beekeeping, honey production, and class information.
Grow a pollinator-friendly garden.
Schedule these timely events on your gardening calendar.
Equipping individuals to lead organizations, communities, and regions.
Guiding communities and regions toward vibrant and sustainable futures.
Guiding entrepreneurs from concept to profit.
Position your business to compete for government contracts.
Find trends, opportunities and impacts.
Providing unbiased information to enable educated votes on critical issues.
Increase your knowledge of public issues & get involved.
Research-based connection to government and policy issues.
Support Arkansas local food initiatives.
Read about our efforts.
Preparing for and recovering from disasters.
Licensing for forestry and wildlife professionals.
Preserving water quality and quantity.
Cleaner air for healthier living.
Firewood & bioenergy resources.
Managing a complex forest ecosystem.
Read about nature across Arkansas and the U.S.
Learn to manage wildlife on your land.
Soil quality and its use here in Arkansas.
Learn to ID unwanted plant and animal visitors.
Timely updates from our specialists.
Eating right and staying healthy.
Ensuring safe meals.
Take charge of your well-being.
Cooking with Arkansas foods.
Making the most of your money.
Making sound choices for families and ourselves.
Nurturing our future.
Get tips for food, fitness, finance, and more!
Understanding aging and its effects.
Giving back to the community.
Managing safely when disaster strikes.
Listen to our latest episode!
Mt. Home, Ark. –
For those who are not familiar with cedar-apple rust, you can see it
on apple tree leaves in the spring and summer. Small, pale yellow-orange spots develop
on the upper leaf surface shortly after bloom. These spots enlarge and turn orange
The chief damage by this disease occurs on apple trees, causing early
leaf drop and poor quality fruit. This can be a significant problem to commercial
apple growers but also harms the appearance of ornamental crabapples in the home landscape.
On apple, symptoms first appear as small green-yellow leaf or fruit spots that gradually
enlarge to become a yellow-orange color. On the upper leaf surface of these spots,
the fungus produces specialized fruiting bodies called spermagonia. On the lower leaf
surface (and sometimes on fruit), raised hair-like fruiting bodies called aecia appear
as microscopic cup-shaped structures. Wet, rainy weather conditions favor severe infection
of the apple. The fungus forms large galls on cedar trees in the spring, but these
structures do not greatly harm native redcedar and ornamental cedar, although some
twig dieback may occur.
The life cycle is complex and involves two plants (apple and cedar) and
their fruiting structures (telia, aecia and pycnia). The pathogen requires two years
to complete its life cycle. The fungus overwinters in reddish-brown galls on the cedar
tree. In the wet spring, the galls extrude gelatinous tendrils consisting of two-celled
teliospores. Air currents carry the teliospores to the apple tree where they infect
within four hours under favorable conditions. In July and August, windborne aeciospores
from apple infect cedar leaves. Rust lesions develop in one to three weeks. The galls
mature the second year after infection.
Resistant varieties of apple and crabapple are the best method of control.
Because it is impractical to keep enough distance between native cedar trees and cultivated
apples or crabapples in the state, fungicides can be used to protect apples against
infection. Several fungicides are highly effective against rust diseases. Fungicides
should be applied just before blossoms open and for the next six weeks to protect
the emerging leaves and developing fruit. Fungicides such as myclobutanil, Bacillus
subtilis, ziram, penthiopyrad, kresoxin-methyl, Pristine, Adament, triflumizole, and
trifloxystrobin will control rust; Captan will not do as good a job. Be sure to read
and follow label directions.
For more information on spraying fruit trees, contact the University
of Arkansas Division of Agriculture Cooperative Extension office at 425-2335.
By Mark Keaton County Extension Agent - Staff ChairThe Cooperative Extension ServiceU of A System Division f Agriculture
Media Contact: Mark Keaton County Extension Agent - Staff Chair U of A Division of Agriculture Cooperative Extension Service 3 East 9th St. Mountain Home AR 72653 (870) 425-2335 firstname.lastname@example.org
The Arkansas Cooperative Extension Service is an equal opportunity/equal access/affirmative
action institution. If you require a reasonable accommodation to participate or need
materials in another format, please contact your County Extension office (or other
appropriate office) as soon as possible. Dial 711 for Arkansas Relay. The Arkansas Cooperative Extension Service offers its programs to all eligible persons
regardless of race, color, sex, gender identity, sexual orientation, national origin,
religion, age, disability, marital or veteran status, genetic information, or any
other legally protected status, and is an Affirmative Action/Equal Opportunity Employer.