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ALERT: Soybean rust found in three Gadsden County, FL sentinel plots
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7/25/06 11:15 a.m. CDT – Florida officials say soybean rust was found on three sentinel soybean plots in Gadsden County in north central Florida.
These sites were located within three miles of an infected kudzu site.
Currently rust has only been found on this year's soybeans in five different counties in three states (Alabama, Florida and Georgia); the rest of the finds have been on kudzu. A total of 25 counties have reported rust this year and include five in Alabama, 12 in Florida, five in Georgia, two in Louisiana, and one in Texas.
Georgia officials reported a soybean rust find on soybeans in Brooks County yesterday, July 24. The two previous finds in this county have been on kudzu.
This is the full report of the new Florida finds from the state commentary:
In samples taken the week of July 17, the three sentinel plots in Gadsden County were positive from a July 21 sample. These are all located within thee miles of a known positive kudzu site. All positive plots are actively sporulating.
The county has had infected kudzu, and it appears that recent rains have begun to spread the disease. Each of the plots was planted to MGIII, MGV, and MGVII beans and is now at growth stages R6, R5, and R3 respectively. In two of the plots, one sporulating rust pustule was observed in a 100-leaf sample from the MGIII variety; in the third plot two leaves from the MGVII variety were heavily infected.
Most of the Florida panhandle has had one or more rain events since these samples were taken, and it looks like rain again today. No other sentinel plots in the panhandle are known to be positive at this time.
These are the first positive soybean sentinel plots in north Florida. With the recent rains the positive kudzu sites around the state are beginning to develop disease rapidly with abundant sporulation; however no new positive kudzu sites have been found recently.
North central Florida has returned to a more normal rainfall pattern, with most days having rain somewhere in the region, although often it is very local. Still, in the panhandle, areas are about 50 percent below normal rainfall for the year. Humidity is high and dew is present, so infections and sporulation are ongoing in infected plots.
As most counties are still negative, risk of rust to soybean growers in Florida is still minimal at this time. However growers should re-evaluate the situation frequently.
A Florida rust "hotline" has been established. A nation-wide toll free number (866) 361-9942 can be used to access it.
Source: National and Florida commentary on www.sbrusa.net
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