CROPS
Corn
Soybeans
Wheat
Canola
Field Guide
Pulse
Cotton
Hay & Forage
Horticulture
Yield Data Centre
LIVESTOCK
Swine
Beef
Dairy
Poultry
Equine
EQUIPMENT
Used Farm Equipment
Farm Equipment Dealers
Machinery News
Technology
Cool Tools
OTHER RESOURCES
Ag Industry News
Agriculture Apps
Agriculture Associations and Organizations
Business & Finance
COVID-19 Resources
Farm Auctions
Farm Energy
Farm Real Estate
Farm Safety
Farm Supplies
Farm Videos
Government & Policy
Mental Health
Precision Ag Conferences
Reflections on Farm & Food History
Rural Lifestyle
Weather
Farms.com Group Businesses
Media & Publishing
Advancing Women in Agriculture ConferenceAg Buyer's GuideAgConnectionAg & CountryAgriville.comAgSearch.com
Alberta Seed GuideBetter FarmingBetter PorkFarms.com Risk ManagementFarms.com Precision Agriculture Digital Digest
Seed ManitobaSeed WorldService Truck MagazineSmall Farm CanadaSpud Smart
Software & Services
Farms.com Professional ServicesPigCHAMP
Talent Solutions
AgCareers.comCareersInFoodCareersInGroceryDe Lacy ExecutiveFoodGradsGrasslands Recruitment Specialists
Farms.com Home  › News

More and more reports of tar spot on corn

By Alison Robertson,Edward R. Zaworski
 
This past week there have been numerous new reports of tar spot within the Midwest, including Iowa (Figure 1). For updates maps, please visit https://corn.ipmpipe.org/tarspot/
 
 
Figure 1.  Map of the Midwest showing where tar spot has been confirmed (red) or is pending confirmation (yellow) as of 9 August 2019
 
Although tar spot is reasonably easy to identify - small, raised black spots on the lower leaves of corn that do not rub off - we are requesting that suspected samples of a few leaves get sent to the ISU Plant Disease and Insect Clinic. Please include the date, county (or nearest township) and information on how much disease is present in the field.  This may include:
  • Percent of plants in the field with tar spot?
  • Which leaves on the plant have tar spot?
  • Approximately how many tar spot occur on each leaf?
  • Does the field have a history of tar spot?  If yes, in what previous years was tar spot observed?
These data will be shared with colleagues in the Midwest who are researching tar spot with a goal of understanding how the disease is spreading.
 

Trending Video

Market Journal

Video: Market Journal

This week, Byrce Doeschot and Steve White are Coming to you from the National FFA Convention in Indianapolis, Indiana.
 
The greenhouse of the future
Secretary Perdue hears farmer concerns

Business News by Better Farming

General News by Better Farming

Forums by Agriville.com

A real lobby effort results ›
Winter wheat harvest Highwood Montana ›
U.S. Midwest Corn Pollination is Widespread in 13+ U.S. States! ›
Rain lottery ›
Friday crop.report on a Thursday middle of July on ›
Current N pricing ›

Machinery News by Better Farming

Deere to Announce Fourth Quarter 2025 Financial Results
Deere to Announce Fourth Quarter 2025 Financial R... ›

Crop News by Better Farming

GoodLeaf Farms raises $52 Million for Canadian capacity expansion and new Agricultural Centre of Excellence
GoodLeaf Farms raises $52 Million for Can... ›

Livestock News by Better Farming

Animal protein not linked to higher mortality risk
Animal protein not linked to higher morta... ›

Sponsored Links: 

Highest Yielding Soybeans,  PigCHAMP Grow-Finish,  Precision Agriculture,  Swine Reproduction Software
Subscribe to our Newsletters Download Farms.com Apps Advertise with us
This website uses tracking tools, including cookies. We use these technologies for a variety of reasons, including to recognize new and past website users, to customize your experience, perform analytics and deliver personalized advertising on our sites, apps and newsletters and across the Internet based on your interests.
You agree to our Privacy Policy and Terms of Access by clicking I agree.