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The UW Field Crops Pathology Team has started scouting white mold locations for apothecia. Overall, apothecia have not been observed at most locations, due to the fact that soybean canopies have not filled in to threshold. At only one location were we able to find apothecia and this location had met the canopy threshold. Remember, canopy closure is critical in calculating the probability of apothecial presence and subsequent white mold risk.
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With all the storms we’ve had this spring, our little friend, the Potato Leafhopper, is showing up in Wisconsin and in big numbers! This tiny insect can cause significant damage to your new seeding alfalfa or freshly cut alfalfa.
Your agronomists at Countryside Cooperative have been out in full force checking alfalfa fields in your area and would be more than happy to help you out too. They will come out and sweep your fields, typically 5-10 days after cutting or in the case of new seeding, it’s always critical to check these tender young plants. Check out the video below from our agronomist, Nick Bloomberg, out of our New Richmond/Milltown area…then contact your agronomist here at Countryside Cooperative.
Don’t forget to tune into WAXX Radio (104.5) for the Brent Wink and Bob Bosold Show every Friday to learn more about what’s happening in our trade territory!
77.6% of corn tissue samples in our area are deficient in ZINC – what should you do?
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Call your local agronomist to discuss your next steps!
The wet spring has been frustrating for a lot of farmers to get crops planted. One consolation with the late start is that there are several weed-control benefits of delayed planting. The primary benefit of delayed planting is that many of the early-emerging weeds will have emerged so they can be taken out with tillage or an effective burn-down prior to planting, assuming the weeds have not gotten too large yet.
Control early-emerging weeds with tillage or an effective burndown
A series of research studies have been conducted at the University of Minnesota investigating how delayed planting dates can enhance the control of herbicide-resistant giant ragweed. Giant ragweed is one of the earliest-emerging weeds in Minnesota, with 90% of seedlings emerging before June 1st. Tillage prior to planting effectively controls giant ragweed seedlings, providing up to 90% control of giant ragweed when tillage and planting occur in early June (Goplen et al. 2018).
Tillage prior to crop planting can also improve control of other herbicide-resistant weeds that emerge early in the growing season, including lambsquarters, common ragweed, and kochia, all of which have substantial emergence prior to June 1st.
Figure 1 illustrates the predicted weed emergence of key species in southern Minnesota in 2019 up until the start of June. These predictions are based on actual growing degree day (GDD) accumulation in southern Minnesota and weed emergence models (Werle et al. 2014). As can be seen in Figure 1, by May 31, early-emerging weeds like giant and common ragweed are nearing the end of their emergence period, while lambsquarters is nearly 50% emerged.
Fields that are tilled and planted this week will likely have significantly-reduced ragweed pressure, so weed control should focus more on weeds that emerge later in the season. Weeds that survive tillage can be more difficult to control later on, so scouting should be continued in heavily-infested areas to ensure weeds were in fact controlled with tillage.
For more information and graphs click here
Excessive precipitation and persistently wet conditions have prevented the planting of corn and soybean in some fields and led to ponding and drown-out areas in others. On acres where “prevent plant” is claimed for insurance, the USDA-Risk Management Agency (RMA) requires protection from erosion and control of noxious weeds. Planting a cover crop to these areas can help control weeds and prevent erosion, while enhancing soil structure and preventing “fallow syndrome”.
Fallow syndrome can occur when there is not enough living root material for beneficial soil mycorrhizal fungi to survive. These “good fungi”, also known as AM fungi, facilitate the uptake of nutrients that are less mobile in the soil, such as phosphorus (P) and zinc (Zn).
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Having someone scout your crops in 2019 is critical! Call your agronomist today to set this service up
“We keep getting this question, because as we write this, it is storming yet again in many locations in the Midwest. Rain, rain, and more rain has pushed back timely planting everywhere. Concern is starting to mount about not only yield loss simply from delayed planting, but what increased risk of yield loss due to disease there might be in 2019. As we consider this issue, we will use tar spot of corn and white mold of soybean as just two examples of where this could be an issue.
The Plant Disease Triangle. Remember that the plant disease triangle is the foundation for understanding how plant diseases develop and how to manage them. In order for a plant disease to occur you must have a virulent pathogen, a susceptible host plant, and favorable weather conditions to coincide at the same time. If any one of these three components is missing (or we implement a management strategy that removes or reduces one component) then a plant disease will not occur. When it comes to the host component, it not only matters that the host is generally susceptible but is also at a susceptible growth stage. Consider white mold of soybeans for a minute. All stages of soybean are susceptible to infection by the white mold fungus, but most infections occur through open flowers. Thus, the disease triangle is met when you have (1)white mold fungal spores flying around at the same time that (2)soybean flowers are open (susceptible stage), during, (3) cool and wet weather (favorable environmental condition)completing the triangle (Figure 1). The point here is that if we continue in a cool wet pattern, and delayed planting continues, we may quickly find ourselves with crops at susceptible growth stages when the weather is very conducive to disease.”
For more information click Scouting is Critical in 2019:
Tony Mellenthin, a member/producer of Countryside Cooperative, was recently a guest on MSNBC with Ali Velshi to discuss the China tariffs.
Tony currently serves as the president of the Wisconsin Soybean Association and has served as the president for the Pepin County Farm Management Club. A must see interview!