Morning Ag Clips logo
  • Subscribe ❯
  • PORTAL ❯
  • LOGIN ❯
  • By Keyword
  • By topic
  • By state
  • Home
  • Events
  • Jobs
  • Store
  • Advertise
  • Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer
  • Subscribe to our
    daily email
    ❯
  • Portal Registration❯
  • Login❯
  • policy
  • tractors & machinery
  • education
  • conservation
  • webinars
  • business
  • dairy
  • cattle
  • poultry
  • swine
  • corn
  • soybeans
  • organic
  • specialty crops
  • Alabama
  • Alaska
  • Arizona
  • Arkansas
  • California
  • Colorado
  • Connecticut
  • Delaware
  • Florida
  • Georgia
  • Hawaii
  • Idaho
  • Illinois
  • Indiana
  • Iowa
  • Kansas
  • Kentucky
  • Louisiana
  • Maine
  • Maryland
  • Massachusetts
  • Michigan
  • Minnesota
  • Mississippi
  • Missouri
  • Montana
  • Nebraska
  • Nevada
  • New Hampshire
  • New Jersey
  • New Mexico
  • New York
  • North Carolina
  • North Dakota
  • Ohio
  • Oklahoma
  • Oregon
  • Pennsylvania
  • Rhode Island
  • South Carolina
  • South Dakota
  • Tennessee
  • Texas
  • Utah
  • Vermont
  • Virginia
  • Washington
  • West Virginia
  • Wisconsin
  • Wyoming

Morning Ag Clips

  • By Keyword
  • By topic
  • By state
  • policy
  • tractors & machinery
  • education
  • conservation
  • webinars
  • business
  • dairy
  • cattle
  • poultry
  • swine
  • corn
  • soybeans
  • organic
  • specialty crops
  • Home
  • Events
  • Jobs
  • Store
  • Advertise
Home » Early season issues: aspergillus, rhizoctonia crown rots in peanuts
peanuts
fungal disease ...

Early season issues: aspergillus, rhizoctonia crown rots in peanuts

Recently, Aspergillus species have been the focus of fungal problems on peanut seed

PUBLISHED ON May 25, 2020

There are many environmental, chemical, and biological factors that can affect a peanut stand; fungal diseases being one of them. Recently, Aspergillus species have been the focus of fungal problems on peanut seed, as well as stand issues in the field (Aspergillus crown rot). But what about when a stand disease issue is not caused by Aspergillus? Does it change how you manage it? photo by Georgia Peanut Commission, Creative Commons/flickr.com)

GAINESVILLE, Fla. — There are many environmental, chemical, and biological factors that can affect a peanut stand; fungal diseases being one of them. Recently, Aspergillus species have been the focus of fungal problems on peanut seed, as well as stand issues in the field (Aspergillus crown rot). But what about when a stand disease issue is not caused by Aspergillus? Does it change how you manage it?

Besides Aspergillus, we have three main fungi that can cause seedling diseases: Cylindrocladium, Pythium, and Rhizoctonia. Typically, seed treatments (Dynasty® PD and Rancona® V PD) should reduce the presence of these diseases, but when we have a low germination rate from seed, or planting was not optimal (e.g. drought conditions or planting too deep), they can become a problem. In particular, Rhizoctonia crown rot has been a problem for Florida peanuts in the past, and has been a common issue for slow germinating or slow growing peanuts. While there is not much that can be done for Rhizoctonia crown rot this year, it is important to identify the pathogen for future disease management.

Crown rots

How can you tell the difference between Aspergillus and Rhizoctonia crown rots? It is not easy to tell the difference between the two diseases without having some fungal structures present. The Aspergillus crown rot fungus produces black spores that can be seen with or without a hand lens on the peanut crown (Fig. 1). On the other hand, Rhizoctonia does not produce spores and needs to be examined in the lab (Fig. 2 below). It is not uncommon to have both pathogens present too, which can complicate diagnosis. It is recommended that a sample be submitted to a diagnostic lab.

Rhizoctonia Management

If you find Rhizoctonia crown rot to be a problem, especially in the absence of Aspergillus crown rot, then there are a few things to consider for future management.

  • Rotate peanuts with a grass crop to reduce Rhizoctonia populations.
  • Avoid planting in non-optimal conditions (e.g. drought, too deep, temps < 68°F)
  • Choose varieties that germinate quickly and uniformly
  • In-furrow application of azoxystrobin# (e.g. Abound®) should provide quality (very good*) Rhizoctonia management
    • # The utility of Abound for controlling Aspergillus crown rot has decreased with the identification of genes known to cause fungicide resistance.
  • In-furrow application of Proline® should provide useful (good*) Rhizoctonia management
    • * Ratings are based on soybean seed treatment efficacy data from Wisconsin

Summing Up

There are multiple fungi that can cause seedling problems with peanuts. It is important to know which pathogens are present, as it can impact your future disease management program. This is especially important when we see shifts either in fungicide usage (as with Rancona), or the identification of fungicide resistance (as with azoxystrobin and Aspergillus). Any growers with stand issues are strongly encouraged to contact their local County Extension Agent and consider submitting a sample to a Plant Disease Clinic.

–Nick Dufault, UF/IFAS

RECOMMENDED ARTICLES

N.C. peanuts: More than PB & hay
June 08, 2022

RALEIGH, N.C. — Shoppers have rediscovered the trusty peanut. Once considered a nostalgic ballpark snack, peanuts are becoming fashionable as an affordable plant-based protein that is surprisingly healthful, delightfully shelf-stable, and locally grown. The roasted legume (not a true nut) has a unique cholesterol-free combination of protein, fiber, minerals, and bioactive compounds that make it […]

2021 Jackson County Farm-City Awards
November 28, 2021

MARIANNA, Fla. — A Farm-City Celebration has been held annually in Jackson County for the past 48 years.  Last year the recognition was virtual via a social media video, but this year’s celebration was a public breakfast once again.  The Jackson County Chamber of Commerce, Farm Credit of Northwest Florida, Jackson County Farm Bureau, and […]

UGA plant pathologist recognized for improving the world, one peanut at a time
November 10, 2021

TIFTON, Ga. — When University of Georgia peanut pathologist Bob Kemerait does something, he does it wholeheartedly. A passionate advocate for producers both near his academic home at the University of Georgia Tifton campus and around the world, Kemerait describes himself as “a field guy,” most comfortable among the rows detecting, diagnosing and addressing the […]

Georgia Peanut Restaurant Week set for Oct. 4-11
October 03, 2021

TIFTON, Ga. — The Georgia Peanut Commission has selected 13 chefs from across the state to create special Georgia Peanut-inspired dishes for the first-ever Georgia Peanut Restaurant Week, taking place from October 4-11. Each chef will use ingredients including raw or roasted peanuts, peanut oil, or peanut flour, to name a few. The selected chefs and some of […]

Heat can increase risk for certain diseases in peanut
May 27, 2021

MACON, Ga. — With temperatures in southern Georgia expected to be near 100 degrees for several days, risks to peanut crop losses can be more severe, according to UGA Extension peanut agronomists. Very warm conditions can bring a greater urgency to early-season control in peanut for Aspergillus crown rot and white mold. UGA’s Bob Kemerait […]

Spread the word

Browse More Clips

Funding opportunities to implement BMPs in Panhandle

UGA Extension offers webinar on backyard fruit production

Primary Sidebar

MORE

FLORIDA CLIPS

Farm Bureau members shine at AFBF Convention in Puerto Rico
January 26, 2023
ASI elects new leadership at Annual Convention
January 26, 2023
beltway beef cattle podcast
PODCAST: What to expect at NCBA’s 125th Convention
January 26, 2023
forestry
FDACS announces $2.6 million available to landowners for protecting Fla. Land Program
January 25, 2023
UF/IFAS offers hemp informational sessions throughout 2023
January 25, 2023
  • Trending
  • Latest

YOU MIGHT ALSO LIKE...

peanuts
USDA names four members and four alternates to the National Peanut Board
January 25, 2023
Today is National Peanut Butter Day!
January 23, 2023
Paul Rogers elected National Peanut Board’s 2023 Chairman
January 23, 2023
New peanut variety released by UF
January 22, 2023
Clemson announces S.C. Peanut Growers Meeting
January 18, 2023

Footer

MORNING AG CLIPS

  • Contact Us
  • Sponsors
  • About Us
  • Advertise with Us
  • Privacy Statement
  • Terms of Service

CONNECT WITH US

  • Like Us on Facebook
  • Instagram
  • LinkedIn
  • Twitter
  • YouTube

TRACK YOUR TRADE

  • Markets & Economy
  • Cattle Updates
  • Dairy News
  • Policy & Politics
  • Corn Alerts

QUICK LINKS

  • Account
  • Portal Membership
  • Just Me, Kate
  • Farmhouse Communication

Get the MAC App Today!

Get it on Google Play
Download on the App Store

© 2023 Morning Ag Clips, LLC. All Rights Reserved.