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Rust found on sentinel plot in Baldwin County, Alabama
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8/16/06 9:21 a.m. CDT — On Aug. 10, soybean rust was detected in a late-planted soybean sentinel plot in Baldwin County near the town of Fairhope, Ala.
The disease had been detected in an earlier planted soybean sentinel plot at the same location on June 27. That plot was destroyed shortly after discovery of the disease.
On Aug. 10, the disease was observed on both a maturity group IV and a group VI variety planted side-by-side. The disease was detected on three groups of plants in the maturity group VI plot. Rust pustules were observed on multiple leaves situated very low in the canopy in three areas within this plot. Growth stage of the maturity group VI variety was R5. Symptoms of soybean rust were also observed on a few leaves on one plant in the group IV plot, which was at the R6 growth stage.
This area of Alabama has been receiving frequent afternoon showers for the past seven to 10 days.
Last week, a survey was conducted in the 14 southern counties of Alabama that border Mississippi in the southwest, Florida in the south and Georgia in the southeast. No rust was detected in the 40 kudzu patches and/or commercial soybean fields scouted during that two-day trip.
Many commercial fields in Baldwin County are between the late vegetative and mid-to-late reproductive stages of growth. Most commercial fields in central and north Alabama are in the R5-R8 growth stages.
A fungicide application of a triazole or triazole/strobilurin premix or tank mix would be most beneficial for growers in the Baldwin County area. Soybean growers in Escambia County should also consider an application of a combination of a triazole and a strobilurin fungicide if their crop is between bloom and pod fill and if they have been experiencing frequent rains in their area. It is not considered economical to apply fungicides for soybean rust prior to bloom or after pod fill.
Source: Alabama commentary on www.sbrusa.net
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