Soybean disease continues to be observed throughout the MS soybean production system. Frogeye leaf spot, root-knot nematode, and a first report of soybean rust occurred over the past 7 days. In addition, widespread fungicide phytotoxicity has been observed in numerous fields due to the hot and humid conditions.
There have been numerous calls and questions about Dectes Stem Borer over the last few years. It seems that numbers are increasing each year. This is not surprising when you consider the biology of the insect coupled with an increase in soybean acres in MS.
We have been getting calls on loopers showing up in soybean for about 2 weeks. In recent days there have been reports of defoliation exceeding 20% or numbers exceeding threshold in some areas in the central to southern part of the state. The bulk of our soybean loopers typically show mid to late August or even into September so this is a little early but certainly not unusual. Soybean loopers are migratory and work their way north each year from southern latitudes. Early arrival could be due to a number of reasons.
Corn harvest is begining across the Delta and early-planted soybean harvest won’t be far behind. Identifying late-season soybean growth stages is important for a number of considerations, such as irrigation termination and harvest aid/desiccation timing decisions. Growth Stage R6- Full
The diseases present in the soybean crop have increased over the past several weeks. Cercospora blight and frogye leaf spot continue to be observed throughout much of MS. Fungicide phytotoxicity continues to be one of the hot topics of the 2015 season with numerous fields having received specific fungicide products that resulted in a foliar injury due to the extreme temperatures.
Over the last week we have been getting a lot of calls about extremely high bean leaf beetle numbers. Most calls have come from the Northwest Delta region of the state. We have actually made bean leaf beetle targeted sprays on a number of acres in recent days. Yield loss is caused by defoliation and less frequently by pod feeding
Week 5 Scouting Report Graduate Student Nick Bateman is running a weekly insect scout line in soybeans for part of his PhD project. We will be reporting his numbers weekly on the blog. Only insect pest that are being found in
Phytotoxicity as the result of applying fungicides that contain an active ingredient that produces an “injury” to soybean leaves has been observed this year. Large areas of fields or entire fields in an area with observable interveinal chlorosis should be observed for the presence of a specific disease. Observing root systems as well as cutting into the main stem to expose the vascular tissue should help tell the difference between many soybean root diseases and whether or not a disease is present.
The Mississippi Department of Agriculture and Commerce releases value of production estimates each year. Below is a list summarized the value of several Mississippi agricultural commodities. For more information click on the link below. Mississippi Value of Production Estimates 1.
The soybean disease situation has not changed much over the past week, but as the crop matures more diseases will likely be observed throughout the state. At present, brown spot, frogeye, the mystery disease, and a few other minor issues can be observed in most soybean fields.
In just the last 3-5 there have been several reports of bollworms now showing up at threshold numbers in soybeans in the Delta region of the state. In many other areas of the Delta folks are reporting flushing extremely high
Stink bugs consisted of Brown, Green, and Southern Green stink bugs, with Green and Southern Green Stink bugs making up 75% of the total stink bugs caught. Loopers are starting to show up in R3 and later soybean in all counties listed but are in low numbers. We also were flushing numerous corn earworm moths in several fields in the Delta region.
Field days scheduled for next week will highlight crops with new and developing herbicide and insect trait technologies. These field days will be held at the following locations: Brooksville – July 15 The Row Crop Technology Showcase at Brooksville will
Bollworm trap numbers in the Delta and Hill regions have continued to increase some over what was reported last week. Southwestern corn borer numbers are still very high in some areas of the Delta and sprays may be needed in
Stink bugs consisted of Brown, Green, and Southern Green stink bugs, with Green and Southern Green Stink bugs making up 95% of the total stink bugs caught. Egg masses of both Kudzu Bugs and Stink Bugs have been seen in both regions in R3 and later soybean.
Numerous fungicide trials were conducted during 2014 to determine the efficacy of specific fungicide products as well as tank mix components at managing Cercospora leaf blight and frogeye leaf spot. Included in this post are ratings as well as yield for eight total trials conducted in Starkville (2) and Stoneville (6) during the 2014 season.
The incidence of soybean diseases in the MS soybean production area has increased over the past 10-14 days. Aerial blight, Cercospora blight, frogeye leaf spot, Septoria brown spot, target spot, and Vein necrosis virus have all recently been observed in commercial soybean fields throughout MS.
An agronomic crops turn row talk will be held at Cliff Heaton farms, just east of the intersection of Highway 61 and Highway 6 on July 9, 2015. The field day will be held in the cotton field
A series of field days will be held throughout Mississippi in 2015 which will highlight crops with new and developing herbicide and insect trait technologies. Field days will be held at the following locations: Dundee – Douglas and Chris Hood
Stink bugs consisted of Brown, Green, and Southern Green stink bugs, with Green and Southern Green Stink bugs making up 85% of the total stink bugs caught. Some small corn earworm larvae were found in very low numbers in the Delta region.
Weekly Soybean Scouting Report for Mississippi Hills and Delta Region 6/22-6/26
Pre-registration is now open for the upcoming Row Crop Technology Showcase events hosted by Mississippi State University. These events will be held at the following locations: Dundee – Douglas and Chris Hood’s farm – July 7 Brooksville – MSU Black Belt
An agronomic crops field day will be held at Cliff Heaton farms, just east of the intersection of Highway 61 and Highway 6. The field day will be held in the cotton field on the south side of the road. MSU Extension Specialists will be present to discuss topics in corn, cotton, grain sorghum, peanut, rice and soybean.
The upcoming Row Crop Technology Showcase events hosted by Mississippi State University have been mentioned a couple of times on Mississippi-crops.com; however, we now have a list of topics that will be covered at each event as well as credits
Questions continue regarding fungicide products to be used at the R3/R4 application timing. The most important decisions should be made based on the specific variety planted in each field since frogeye leaf spot is resistant to the strobilurin class of fungicides meaning that stand-alone strobilurin products are no longer effective against the disease. See the information contained within this blog post regarding fungicide products, effective rates of products in pre-mix combinations and the effectiveness of some fungicides on managing frogeye leaf spot.
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