Virus-infected soybean material has been observed almost statewide this season. The high numbers of bean leaf beetles can be blamed for some of the observed viruses; however, bean leaf beetles are not the only insects that can vector soybean viruses between plants. This specific blog update presents information on the three most commonly encountered soybean viruses in the MS soybean production system.
Soybean disease questions still consider to be raised throughout MS. Even though soybean rust has been detected in 45 counties to date it appears we will have another season where yield losses as a result of soybean rust will be extremely limited and may only have occurred in a handful of fields. When making plans for next year consider sampling for nematodes in light textured soil classes. In addition, planting a frogeye susceptible variety in several years in a continuous soybean system may increase the likelihood of frogeye causing substantial yield loss.
Numerous diseases continue to be reported from throughout the MS soybean production area. Frogeye leaf spot continues to be the main foliar disease observed. Additional soybean rust was reported from Adams County this past week. However, since low levels of the disease continue to be reported the suggestion remains that farmers wait and watch the available information and allow soybean to get as close to reproductive developmental stages before making a fungicide application.
Over the past two weeks increased reports of soybean diseases have been made from throughout the state. In addition, in southern MS, two more counties have been confirmed to be positive for soybean rust.
The Soybean Minute is a new radio program that can be heard on the Mississippi AgriNews Network. These reports, sponsored by the Mississippi Soybean Promotion Board and the United Soybean Board, offer the latest information on soybean production in Mississippi.
Once again this season soybean rust has been detected early in July. A single infected leaf was discovered in a soybean sentinel plot in Pearl River County on Tuesday, July 9, 2013. Historically this is 4 days earlier than last season (2012) and 2 days earlier than the earliest occurrence of rust in MS that occurred in 2007 on kudzu. At present, no additional management scenarios are necessary. We continue to scout to determine how widespread infection may be across south MS.
Over the past two weeks soybean diseases have become apparent throughout the MS soybean production system. Isolated reports of frogeye leaf spot in reproductive maturity soybean fields as well as Fusarium wilt have been on the rise. Stay tuned to the Mississippi Crop Situation Blog for disease monitoring situations, including maps of counties where soybean rust and strobilurin-resistant frogeye have been made throughout the 2013 season.
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