New Stinger formulation called Stinger HL
Corteva has come out with a new Stinger formulation called Stinger HL (High Load). This is a more concentrated formulation than Stinger, resulting in Stinger HL being used at lower rates than Stinger to provide the same active ingredient/acre.
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Both products will be out in the market this year, so it is critical to be aware of what product you are using and applying the correct rate.
Common ragweed is becoming more difficult to control so it is important to maximize efficacy by spraying either
formulation twice on small weeds.
Links to Weed Control Quick Sheets
Proper Timing of the Initial Cercospora Leafspot Fungicide Application
Proper timing of the initial fungicide application is key in delaying cercospora leafspot (CLS) infections to keep disease severity low and in-check. The earlier CLS becomes established in a field, the higher the resulting disease severity and
its impact on yield and quality. This is because CLS is polycyclic in its reproduction, producing multiple generations in a single growing season and continually infecting sugarbeet leaves.
The chart below from a Wolf 2004 research paper illustrates how drastically CLS Disease Severity can increase with early infections.
Cercospora Leaf Spot Economic Damage
Economic damage analysis from Wolf’s 2000 research:
Cercospora infection impacts the sugarbeet in two ways:
Consequently, potential sugar yield of the sugarbeet crop can be significantly reduced due to the loss of both root weight and sugar content.
Root weight is impacted approximately twice as much as sugar content – (Rossi 2000), (Skaracis 2010).
2020 RRV Initial Timing of Cercospora Fungicide Observations
Data from the ACSC Grower Practices Database indicates that tonnage will continue to decrease the longer the initial fungicide application is delayed. See chart below
The 2020 crop year signifies the importance of a well-timed initial fungicide application. The 5 yr. data also holds true to this trend of initial fungicide timing on yield and RSA.