Ryegrass has become a serous weed issue in some fields the past couple of years. A major reason for this is that much of it is now glyphosate-resistant. Even if clethodim is used rather than glyphosate often it is applied on ryegrass sometime in late March through April when the grass is too well established to provide consistent control. Continue reading
Practically every September some growers are dismayed at the vine infestations present at corn harvest. Often, these weed infestations emerged after PRE applied or early POST applied herbicides had played out. They grew very little until August and as the corn dried down and light became more available those established weeds started rapidly growing. Continue reading
Corn harvest is upon us in Tennessee and we have had a few calls about scouting for ear rots and managing mycotoxins. Continue reading
It’s extremely important to know when to stop irrigating corn crop while considering the best kernel development, quality, and yield. Continue reading
| Location | CEW | TBW |
| Hardeman (Bolivar) | 0 | 0 |
| Fayette (Whiteville) | 0 | 0 |
| Fayette (Somerville) | 1 | 0 |
| Shelby (Millington) | 1 | 0 |
| Tipton (Covington) | 1 | 0 |
| Tipton (North) | 0 | 0 |
| Lauderdale (Golddust) | 16 | 0 |
| Haywood(West) | 12 | 0 |
| Haywood (Brownsville) | 0 | 0 |
| Madison (WTREC) | 107 | 6 |
| Madison (North) | 2 | 0 |
| Crockett (Alamo) | 0 | 0 |
| Crockett (Friendship) | 1 | 0 |
| Dyer (King Rd) | 7 | 0 |
| Dyer (Dyersburg) | 5 | 0 |
| Lake (Ridgely) | 1 | 0 |
| Gibson (Trenton) | 4 | 0 |
| Gibson (Milan Rec) | 0 | 0 |
| Carroll (Coleman Farm) | 2 | 3 |
Last fall there was a notable amount of Palmer amaranth in many corn fields in areas of the state where we had confirmed dicamba resistance. As a result, we have recently conducted some field screens on these pigweed populations to herbicides used in corn and soybean.
Figure 1
From late April and throughout the month of May, many parts of Middle and West TN have received persistent rainfall that is well above the average for this period. These rains have produced persistently wet soil conditions and have coincided with sidedress N fertilizer application where most or all of the recommended N is applied. With this much rain, there is potential for N loss. Continue reading
Carryover injury from fomesafen (Flexstar, Prefix, Reflex, Intimidator, Marvel, Dawn, Rhythm, etc.) is starting to show in a few corn fields. This is because some applications in late June and July in 2023 coupled with a very dry fall allowed the herbicide to persist into winter. Recent rains then allow any herbicide carryover to more completely get into the soil solution.
Fomesafen carryover injury in corn and grain sorghum looks similar. Expect to see stunting and interveinal chlorosis as pictures below sent from crop consultants clearly shows.
