Corn/Maize
Nancy Kavazanjian Nancy Kavazanjian
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Topics: Corn/Maize, Crop Diseases,
Team AgWiki Team AgWiki
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Topics: Corn/Maize, GMO's, Ag North America,
Nancy Kavazanjian Nancy Kavazanjian
shared this article 2 years ago
Topics: Corn/Maize, GMO's, Trade (Commodities),
Nancy Kavazanjian Nancy Kavazanjian
shared this article 2 years ago
Topics: Corn/Maize, Agriculture US, Fungicides,

Fungicide Efficacy on Tar Spot and Yield of Corn in the Midwestern United States | Plant Health Progress

Tar spot of corn caused by Phyllachora maydis has recently led to significant yield losses in the eastern corn belt of the Midwestern United States. Foliar fungicides containing quinone outside inhibitors (QoI), demethylation inhibitors (DMI), and succinate dehydrogenase inhibitors (SDHI) are commonly used to manage foliar diseases in corn. To mitigate the losses from tar spot, 13 foliar fungicides containing single or multiple modes of action (MOA/Fungicide Resistance Action Committee groups) were applied at their recommended rates in a single application at the standard VT/R1 (tassel/silk) growth stage timing to evaluate their efficacy against tar spot in a total of eight field trials in Illinois, Indiana, Michigan, and Wisconsin during 2019 and 2020. The single MOA fungicides included either a QoI or DMI. The dual MOA fungicides included a DMI with either a QoI or SDHI, and fungicides containing three MOAs included a QoI, DMI, and SDHI. Tar spot severity estimated as the percentage of leaf area covered by P. maydis stroma on the ear leaf of the nontreated control at dent growth stage ranged from 1.6 to 23.3% in the trials. Averaged across eight field trials all foliar fungicide treatments significantly reduced tar spot severity, but only Delaro 325SE (prothioconazole + trifloxystrobin), Revytek 3.33LC (mefentrifluconazole + pyraclostrobin + fluxapyroxad), and Veltyma 3.34S (mefentrifluconazole + pyraclostrobin) significantly increased yield over the nontreated control. When comparing groups of fungicide treatments by the number of MOAs, foliar fungicide products that had two or three MOAs decreased tar spot severity over not treating and products with one MOA. In addition, the fungicide group that contained all three MOAs significantly increased yield over not treating with a fungicide or using a single MOA group.

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TOPIC(S): Wheat, Corn/Maize, Soybeans,
TOPIC(S): Corn/Maize, Agriculture US, Fertilizer,
TOPIC(S): Corn/Maize, Agriculture Global, GMO's, Ag South America, Ag North America,
Team AgWiki Team AgWiki
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Topics: Corn/Maize, Education U.S. MidWest, Sustainability, Regenerative Agriculture, Carbon Farming,
Team AgWiki Team AgWiki
shared this article 2 years ago
Topics: Wheat, Corn/Maize, Soybeans, Agriculture US, Agriculture Global, GMO's, Consumer/Retail,

EXPLAINER-Biotech corn and soy widely used, consumers still wary of GM wheat

Nearly all corn and soybean acres in the world's largest exporting countries are seeded with genetically modified varieties, but that is not the case for wheat, a crop grown primarily for human food. Biotech varieties of corn and soy, used for animal feed, biofuels and ingredients like cooking oil, were introduced in 1996 and soon came to dominate plantings in the United States as well as Brazil and Argentina, the world's top suppliers. But genetically modified wheat has never been grown for commercial purposes due to consumer fears that allergens or toxicities could emerge in a staple used worldwide for bread, pasta and pastries.

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