We are making the transition to a paperless means of delivering future Ag Notes. This Issue, #601, will be the last issue printed and mailed hard copy (paper). Our plan for shareholders is to issue a text message indicating when the latest issue of Ag Notes will be posted here on our website, which is publicly available to the Allied Industry as well.
Cercospora Leafspot Management Notes
For this upcoming crop year, Cercospora Leafspot (CLS) management will involve added measures for reducing CLS presence amidst increasing occurrence of fungicide resistance. We continue to wait for final label ruling on potential fungicide availability and use. In the meantime, here are measures to follow as was discussed at this past winter’s Your Way to Grow Meetings at your respective district, our recommendations for best overall resistance management strategy are:
- Tank mixes – All fungicide applications should contain more than one chemistry or mode of action. Utilizing all available fungicide chemistry wisely is vitally important to current fungicide options today and tomorrow.
- Full Rates – For these tank mixes, utilize full application rates of each tank mix partner following label recommendations.
- Glyphosate tank mixes – Please decouple glyphosate applications tank mixed with fungicide applications as water volume requirements vary between glyphosate and CLS fungicide applications.
- Water volume – CLS fungicides require excellent coverage as nearly all are contact/coverage oriented products. 15 to 20 gallons of water per acre should be utilized.
- Pressure – For maximum coverage, higher pressure application will provide improved leaf coverage. Utilize 90 – 100 psi application pressure.
- Spray nozzles/tips – Obtain and use proper nozzles for fungicide application (for example, flat fan or spray tips used for applying glyphosate are not recommended).
- Tins (TPTH) – Tin (TPTH) to be used in only two applications per cropping season and only as a tank mix with other chemistry. Tins are vital to CLS management and concerns of overuse may incite further resistance concern.
- EBDC’s (Mancozeb/Manzate) – EBDC chemistry will be included in our fungicide management plan as a tank mix partner.
- Headline/Priaxor (Strobilurin) – Amidst increasing resistance to this chemistry/mode of action, Headline/Priaxor remain in our recommendation for harvest frost deterrence and plant health benefits and only in concert with a tank mix of Tin (TPTH) at full rate. Your Agriculturist has resistance information pertaining to your region on Headline/Priaxor recommendations.
- Topsin (Benzimidazole) – To only be used with tank mix (e.g. Tins TPTH) and only once per season.
- Infection values – The current Cercospora Model works well, pay attention to Daily Infection Values (DIV’s) and weather forecasts for fungicide application timing. NDAWN website or Crystal Agronomy App.
- Spray intervals – the time between applications should not exceed 14 days, plan best as possible around adverse weather conditions (rain, wind, hail).
- No chemistries back to back – Pay attention to chemistry and classes of fungicides while focusing on not applying same chemistry back to back.
- Contact Agriculturist – For further details in regards to your growing region, please contact your Agriculturist.
CONTACT YOUR AGRICULTURIST
Contact your American Crystal Agriculturist for the most up-to-date information on issues affecting sugarbeet crops in your area.