Tar spot tolerance is strong in some corn hybrids, according to recent research. There are no truly immune varieties, however, and as the amount of inoculum in the region grows, weather will remain the dominant factor in the pathogen’s development from year to year. Why it matters: Tar spot is expected to become endemic in […] Read more
Tag Archives tar spot — page 2
Tar spot poses challenge for hybrid genetics
Weather a dominant factor in pathogen development, even in tolerant varieties
Let’s talk about tar spot
OMAFRA Field Crop Report for September 15
There has been considerable discussion around tar spot disease in corn this season and of course many questions as well. Let’s go over some of these questions! Where did Tar Spot common from? In 2015, Tar Spot was confirmed in the Midwest US (Indiana/Illinois) where it was believed to have been blown in from Mexico on […] Read more
Update on tar spot in corn
OMAFRA Field Crop Report for August 18
Tar spot in corn was first identified last year in Ontario on September 21, 2020 and confirmed to overwinter in Ontario on July 2, 2021 in West Elgin. Since then, tar spot has been also detected in Essex, Chatham-Kent, Lambton, Middlesex and Norfolk counties as of July 18, 2021 (see below). This was anticipated since […] Read more
Tar spot detected in Ontario
Scouting is critical to deal with spread
Frequent rains and prolonged wetness are likely the contributing factors for Ontario’s earliest instance of confirmed tar spot. “This is the first time we’ve seen it this early based on overwintering population from Ontario,” said Tenuta, field crops pathologist for Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA). “Last year, it would have been […] Read more
What tar spot’s arrival means for Ontario
Cases identified in Lambton and Chatham-Kent, but impact insignificant overall
Tar spot, a pathogen affecting corn, has moved into Ontario, after five years of international attention. Tar spot can cause significant yield losses if left unchecked. The problem does not now appear to be widespread. Why it matters: Evidence from the United States indicates tar spot can depress corn yields by 20 to 60 bushels […] Read more
Tar spot breaches Ontario border
Cases identified in Lambton and Chatham-Kent, but impact insignificant overall
After five years of international attention, tar spot has infiltrated Canada’s Great Lakes defences. A pathogen of corn, tar spot can cause significant yield losses if left unchecked. As of now, however, the problem does not appear to be widespread. Why it matters: Evidence from the United States indicate tar spot can depress corn […] Read more
Tar spot in corn and soybean cyst nematode
OMAFRA Field Crop Report for August 13
This week we would like to discuss tar spot in corn as well as soybean cyst nematode and sudden death syndrome in soybean. Tar spot in corn There is a lot of discussion and questions surrounding tar spot this year in Ontario. Tar spot is a new corn disease in the U.S. midwest and since […] Read more
Storm suspected of carrying new corn disease into U.S.
Chicago | Reuters — A tropical storm could have carried the corn disease tar spot into the heart of the U.S. farm belt for the first time, as winds and rain blew in from Latin America, researchers told Reuters. The U.S. Department of Agriculture has confirmed cases of tar spot in at least four locations […] Read more
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