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ALERT: Asian soybean rust found on yam beans in Veracruz, Mexico
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By Marilyn Cummins, Editor
StopSoybeanRust.com
7/23/2007 10:15 a.m. CDT -- Mexican officials have confirmed the presence of Asian soybean rust on yam bean leaves in the state of Veracruz in January, 2007.
According to a report posted July 12, 2007, on the North American Plant Protection Organization's Phytosanitary Alert System, "by the middle of January 2007, the Plant Health General Directorate received samples of yam bean (Pachyrhizus erosus) crop foliage from the communities of Agua Dulce and Pajapan, in Papantla township, in the state of Veracruz. These samples showed signs and symptoms of Asian soybean rust (Phakopsora pachyrhizi)."
Veracruz is in east-central Mexico, on the Gulf of Mexico. It is one state south of the state of Tamaulipas and one state east of San Lois Potosi, both of which had Asian soybean rust on soybean leaves in February, 2006.
Per the latest report, "These samples were analysed and processed by technical personnel of the National Center for Phytosanitary Reference Micology Laboratory to determine the pathogen. To this end, it was necessary to analyze the morphology of its reproduction structure, as well as to conduct a molecular analysis. The results of these analysis confirmed the presence of the disease called Asian soybean rust (Phakopsora pachyrhizi).
"Through the Plant Health Committee of Veracruz, the SENASICA did a follow-up of the detected outbreak, taking immediate actions to prevent the spread of the disease to other hosts by applying triazole and strobiruline fungicides.
"Furthermore, given the importance of the disease, yam bean growers carried out a phytosanitary survey as a culture measure in the areas where the disease was more advanced, to minimize the inoculation source for the next cycles of the crops."
According to a ProMED post from the International Society for Infectious Diseases, yam bean (also called Jicama, Mexican potato) is a leguminous vine native to the tropical Americas that can reach a length of several meters. Roots can weigh up to 20 kg (44 lb) and are usually eaten raw. Seeds are eaten cooked.
This July report and the report of soybean rust on soybeans in February, 2006, are the only two official reports of soybean rust in Mexico reported through the NAPPO site. The USDA Pest Information Platform for Extension and Information at www.sbrusa.net is set up to show rust scouting and confirmation for Mexico in 2007, but no information is yet visible to the public on the observation maps for that country.
Source: North American Plant Protection Organization's Phytosanitary Alert System; ProMED from the International Society for Infectious Diseases.
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