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New Weed Resistance Hits Nebraska: Waterhemp to HPPD-Inhibiting Herbicides

A population of common waterhemp has developed resistance to postemergent application of HPPD-inhibiting herbicides (e.g., Callisto, Laudis and Impact). This resistance occurred in a seed-corn production system where these HPPD-inhibiting herbicides were repeatedly used over the last five years.

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  • waterhemp
    Jun. 18, 2013
    Article

    Screen Waterhemp for Herbicide Resistance

    The weed science program at the University of Illinois is offering free screenings for herbicide resistance in waterhemp to Illinois farmers during the 2013 growing season. Aaron Hager, associate professor of weed sciences at U of I, says with continued financial support from the Illinois Soybean Association, over 1,000 plant samples have been screened through the collaborative effort between the U of I and the ISA....More
  • Jun. 12, 2013
    Article

    5 Tips for Early-Season Post-Emergence Weed Control

    After starting the season with clean fields at planting, now is the time to focus on early-season weed control to maintain maximum yield potential. For corn, weeds can reduce yield as soon as the V2 stage or when corn is roughly 6-8 in. tall....More
  • spray nozzles, pesticide application
    Jun. 7, 2013
    Article

    6 Tips to Get the Most Out of Spray Nozzles When Applying Pesticides

    Choosing the right type of sprayer nozzle can make a huge difference in how effective pesticides are during a growing season and whether growers have to re-spray their fields or in some cases, replant, says Erdal Ozkan, an agricultural engineering professor and spray technology expert with Ohio State University Extension and the Ohio Agricultural Research and Development Center (OARDC)....More
  • marestail, horseweed
    Jun. 6, 2013
    Article

    Horseweed (Marestail) Control After Corn, Soybean Emergence

    Over the past several days, growers have increasingly been looking for options to control marestail after corn and soybean emergence, says University of Illinois Associate Professor of Weed Sciences Aaron Hager. “Many have reported poor marestail control from herbicides applied prior to planting (primarily no-till soybean), especially when these burndown applications contained only glyphosate or glyphosate and 2,4-D."...More
  • Jun. 5, 2013
    Article

    Soil Residual Herbicide Options After Soybean, Corn Emergence

    With very tight windows of opportunity to plant this year, pre-emergence herbicides may not have been applied as planned. Application of a residual herbicide prior to planting or emergence of the crop, in both corn and soybean, is a great weed management strategy overall and also a key tool in managing against herbicide resistance. What are some options if soybeans emerged before a pre-emergence herbicide application was made?...More
  • waterhemp growing in field.
    May 20, 2013
    Article

    Control Emerged Waterhemp Before Planting Soybeans

    The increasing prevalence of waterhemp plants and populations that demonstrate resistance to herbicides from more than one site-of-action family increases the importance of controlling any emerged waterhemp plants before planting....More
  • May 14, 2013
    Article

    6 Tips for Postemergence Application of Pre-Emergence Corn Herbicides

    One of the problems with a wet start to the season when planting gets compressed into short periods is the lack of time to apply preemergence herbicides and 28% before corn emerges. Most pre-emergence corn herbicides can be applied to emerged corn, and some of them have enough foliar activity to control small, emerged weeds without the need to add postemergence (post) herbicides....More
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