Microorganisms associated with alfalfa crown rot in north central Mexico

Rodolfo Velásquez-Valle, Luis Roberto Reveles-Torres, Hugo Talavera-Correa

Abstract


Alfalfa is an important forage crop in the states of Aguascalientes, Durango, and Zacatecas located in the northern-center of Mexico. Very scarce information is available on the spots of killed plants attributed to the disease known as crown rot and its associated microorganisms in this region. Therefore, the objective of the current work was to identify the genera of microorganisms associated to crown rot in the mentioned states. Samples of alfalfa plants showing crown rot symptoms and soil around them were collected in 30 alfalfa fields. Thirteen nematodes genera were identified in the soil samples: (Aphelenchus, Aphelenchoides, Criconemoides, Ditylenchus, Dorylaimus, Helicotylenchus, Mononchus, Pratylenchus, Psilenchus, Rhabditis, Trichodorus, Tylenchus, and Xiphinema) as well as five fungi (Fusarium, Rhizoctonia, Verticillium) and oomycetes (Phytophthora, and Pythium) genera in the crown tissues. It is remarkable the high incidence of Ditylenchus (56.7%), Pratylenchus (50%) and Fusarium fungi (100%).


Keywords


fungi; nematodes; oomycetes; regional distribution

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References


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DOI: http://dx.doi.org/10.18781/R.MEX.FIT.1806-1

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