There have been quite a few questions on the basics of grain sorghum production this spring. Attached below are some short you tube videos on grain sorghum management. Continue reading
14
May
2015
All posts by Larry Steckel, Extension Weed Specialist
13
May
2015
Grass Weed Control Options When PREs Fail in Grain Sorghum
13
May
2015
Over the last several years activation of PRE applied herbicides with timely rainfall has been more the rule than the exception in Tennessee. That is not the case for most of the state this year. The most common call in this regard the last several days have been on grain sorghum fields where the crop and the weeds have emerged together due to lack of an activating rain on the PRE applied herbicides. Continue reading
11
May
2015
Management of Palmer Amaranth in Non-Activated PRE Herbicide Situations
11
May
2015
As anticipated the dry conditions that we experienced last week and that continue through today are not activating pre applied herbicides. Reports of Palmer amaranth already 1 to 2” tall with emerging crops appears to be common. How to proceed from here on weed management depends upon the crop as well as the herbicide tolerant trait in the crop. Continue reading
06
May
2015
Lack of Activating Rain on PRE Applied Herbicides
06
May
2015
Corn, soybean, cotton and grain sorghum are all being planted as fast as possible. In typical Tennessee weather tradition, we have gone from too wet to too dry in a very short period of time. The rain forecasted for this week did not appear and the best chance for rain will likely be early next week. There is no doubt we will need that rain!
There have been a lot of herbicides applied PRE and many of them will sit a good 10 to 20 days before our next best chance to get a rain to activate them. A common question has been “how long can those herbicides wait before a rain?” Continue reading
29
Apr
2015
Managing Ryegrass Burndown Escapes and Grain Sorghum Herbicide Questions
29
Apr
2015
Ryegrass surviving glyphosate burndown continues to be a common call the last few days. Continue reading
22
Apr
2015
Destroying a Poor Stand of Corn and Replanting Back to Corn
22
Apr
2015
There has been little corn planted to this point. Judging by the phone calls today some of that early planted corn will need to be replanted due to all the wet and cold weather. The question arises how to control the old corn stand and plant back to corn quickly. Continue reading
22
Apr
2015
Application Time of Day Effects Gramoxone
22
Apr
2015
With planting hopefully right around the corner, many people are thinking about using Gramoxone (paraquat) as a last minute burndown for its effectiveness and lack of replant interval. Gramoxone is a very good broad spectrum herbicide that is “money” on many winter annual broadleaf weeds and also quite good on poa. On the main winter annual weed horseweed (marestail) though, control can range from 30 to 90%. The question is why? So we conducted research this spring to see if time of day Gramoxone is applied has an effect on horseweed control. Continue reading
14
Apr
2015
Late Cotton Burndown Strategies
14
Apr
2015
With cotton planting just around the corner, some folks are interested in tankmixing a residual herbicide in with their burndown. The typical herbicides used for this purpose would be Sharpen (42 day plant back to cotton), Valor (30 days plant back to cotton) and Leadoff (30 days plant back to cotton) but these are no longer options as the plant back interval is too long. Continue reading