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Some fungicides in short supply: Louisiana

Many older soybeans in central Louisiana were treated with fungicides following rainfall in late June, according to Roger Carter of Agricultural Management Services, which serves parishes in east central Louisiana. Oldest soybeans in his area are at R6. The youngest are at the V3 stage.

“Quadris is practically non-existent. Stratego also short. Headline and others are still OK thus far. Quadris plus Topsin was our standard where cercospora was a threat,” he reported in his AMS Ag Report dated July 6. “We are using Stratego, Headline, or others at R3, then treating with Topsin at full rates 10 to 14 days later.”

Threshold levels of stink bugs were found in several hundred acres of soybeans near R6 in south Tensas.

“Most soybeans we are scouting to the south are of the 5.4 to 5.9 maturity stage, therefore, stink bugs are just beginning to recognize them as a food source. We have heard of heavy populations of stinkbugs in earlier-maturing varieties planted in the same area,” Carter reported.

Three-cornered alfalfa hoppers also were increasing to treatable levels. “Bean leaf beetles are much less of a problem than we anticipated given the dry weather we experienced. Corn earworms have yet to be an issue.”

Other crop conditions included in the July 6 AMS Ag Report:

CORN —We expect some corn to be harvested this week although dry-down has not occurred as rapidly due to lower temps, less wind, and some cloud cover. There is talk of aflatoxin, but we should have received enough rainfall and lower temps on most of the corn to reduce the incidence of it.

GRAIN SORGHUM —Sorghum webworms are near threshold levels in some fields with borers present in south Tensas Parish. Will try 6 oz of Intrepid per acre in 5 GPA total volume plus a spreader sticker. Borers are the main concern.

Late-season grain sorghum (that planted behind wheat) is infested with armyworms in the whorls, but we have observed only a few borers. With borer incidence likely in these fields, they will probably be treated with a pyrethroid approximately seven days prior to boot stage. Treatments for midge should hold borers at bay until seven days following the last midge shot. Intrepid may then be applied if we get the Section 18.

Yield potential for grain sorghum on clay soils that have been dry for some time is limited, but most heads are emerging and potential is probably greater than most farmers think.

COTTON — Our oldest cotton at the 21st node. Youngest at seventh true leaf. NAWF is approaching 5 or less on several thousand acres of cotton.

555/515 withstanding dry conditions much better than new Flex varieties. Even the long-season Flex varieties are giving up early. Foliar feeding with 22 percent foliar feed is aiding some cotton, but it is no substitute for water.

Spider mites being treated in a few fields. Problem will worsen without sustained rainfall. Aphids present in most fields, but some fungus was observed this past week in taller cotton and we expect to see more this week. Only the smallest cotton will be treated for aphids this week.

Plant bugs increasing to threshold levels in most fields that have yet to be treated. Second application is being applied to 30 to 35 percent of acres. Diamond being added where reproduction is occurring and canopy is nearing closure. Neonics are still involved in 70 percent of treatments, but that will change soon due to increase in stink bugs that will require the use of Bidrin or Orthene.

Growth regulators are still being applied. Stance still being used where growth may be in question due to erratic moisture conditions. Others including generics used where moisture is not a problem.

Lay-by is complete on most cotton. Some weed escapes are occurring where moisture was inadequate to incorporate or activate herbicide or where inadequate rates were used. Control of established grass less than adequate where glyphosate was added to Direx.

Control of millet a problem for anything but glyphosate or heavier rates of Poast plus crop oil. Addition of dry ammonium sulfate at a minimum of 1 pound per acre with either product enhances grass control. Many farmers opting to add Prowl or Dual to lay-by to combat millet.

Crop potential still OK, but may fade fast without rainfall soon.

Tim White, Walter Myers, Wil Miller, Matt Myers, Lydia Ellett, and Roger Carter of Agricultural Management Services, Inc., are located in east central Louisiana, serving Catahoula, Concordia, northern Avoyelles, southern Franklin, and southern Tensas parishes.

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