After harvest is the perfect time to take soil samples not only for nutrient analysis but also to look for pathogens. You’ll never know if you have silent yield robbers lurking in the soil unless you look for them – Take the test, beat the pest!
Speeding up a slow boll…managing regrowth…or avoiding it all together. Dr. Tyson Raper addresses these issues in this podcast recorded on 10/4/19. Listen.
WIDELY SCATTERED SHOWERS BRING LITTLE RELIEF
Widely scattered showers occurred across the state last week, but these did little to relieve extremely dry conditions. Corn and soybean harvest continued with producers continuing to report favorable yields for both corn and early crop beans. In some areas, deteriorating pasture conditions forced livestock producers to start feeding hay, leading to concerns that they may run short of hay during the winter months. Availability of water for livestock was also a concern, with some farmers having to haul in water for their herds. There were 6.1 days suitable for field work. Topsoil moisture was rated 35 percent very short, 43 percent short, and 22 percent adequate. Subsoil moisture was rated 28 percent very short, 53 percent short, and 19 percent adequate. Hay & Roughage Supplies rated 1percent very short, 13 percent short, 72 percent adequate, and 14 percent surplus. You can read the entire report here: TN Crop Weather 09_30_2019. You can also read the latest U.S. Crop Condition report here: US Crop Progress 09_30_2019.
With all the issues with ryegrass in wheat last year many are asking if there are any better options for control. The main issue is resistance. About 10 years ago resistance to ALS-inhibiting herbicides (Broadstrike, Finesse, Osprey) started showing up and now a decade later is a very common biotype in many fields. As a result, many moved to Axial to control ryegrass and it did a very good job for some time but in recent years ryegrass control has slipped as well. So what are some good options now?
One of the best options to use is a pyroxasulfone-based herbicide this fall. There are three herbicides with the active ingredient pyroxasulfone in them that now have labels for wheat in Tennessee. The three herbicides are Anthem Flex (pyroxasulfone + Aim), Fierce (pyroxasulfone + Valor) and Zidua (pyroxasulfone). In our research, all have provided very effective control of ryegrass.
Of course it would be too easy if they all had the same label directions in wheat but they differ a good bit. Many of those differences go to best management practices to avoid wheat injury. Here are some particulars:
Anthem Flex can be applied from PRE-emergence to early POST (3 tillers). The going rate would be 2.8 to 3 oz/A. The 2.8 oz/A rate provides 1.5 ozs of pyroxasulfone. Do not apply to coarse textured soils as the probability for loss of wheat stand is increased greatly. Do not apply on broadcast wheat due to increased potential for crop response. Plant in to good moisture and avoid spraying prior to a rainfall event during germination. In other words, if wheat is to be planted and there is a good chance of rain in the next two days, then go to ”Plan B” and apply it POST to avoid potential injury. The POST application should be applied up to 3 tillers of growth with 3 oz/A of metribuzin to clean up any emerged weeds.
Fierce can be applied up to 14 days before planting. A glance at the label would suggest it can be applied to wheat at a rate up to 3.0 oz/A. The 3 oz/A rate is not recommended in Tennessee. Research conducted in Georgia, North Carolina and Tennessee would suggest that a rate of 1.5 oz/A of Fierce has provided good weed control and greatly tamped down potential wheat injury. Other recommendations to avoid loss of wheat stand with Fierce is to plant wheat no-till at least 1” deep.
Zidua is labeled as a “delayed” PRE application for control of ryegrass. The definition of delayed PRE historically has varied but in Zidua’s case if the wheat has a ½” shoot it is good to go. In practical terms it would be 3 to 7 days after planting depending upon soil temperature and moisture. The rate of Zidua to use is 1 to 2 oz/A depending upon soil type. The trick is to apply Zidua after that ½” shoot but before most of the ryegrass or poa has emerged. If you can hit that timing, Zidua will do a great job of controlling those weeds.
Our 2019 Tennessee corn silage hybrid trial report is now available on search.utcrops.com/corn-silage. We had fewer hybrids than usual this year and all produced similar yields, averaging 8.4 tons/ac dry weight. Differences did show in terms of quality, however, with some hybrids producing significantly higher milk/ton. Mean separation (MS) values help us identify statistical differences between hybrids. Look for the “A” group to identify hybrids that were top performers within each trait. If looking at the online tables, be sure to scroll right to see all of the quality and agronomic traits evaluated. Online tables can be found here or download the pdf and/or excel tables.