Yearly nematode population variation in Stargrass, Tannergrass, Smutgrass and Setariagrass in Alajuela, Costa Rica

Rodolfo WingChing-Jones, Luis Salazar Figueroa


Nematode populations can affect productivity in cattle grasslands.Every 30 days from January 2004 to January 2005 we measured nematode
populations in grass rhizospheres in northeastern Costa Rica.The substrate, sampling moment, and their interaction, were significant factors in the populations (p<0,05). We found Pratylenchus sp.,
Helicotylenchus sp., Tylenchus sp. and non-parasitic nematodes (1,02;2,36, 1,28 y 3,87 log10 N° nematodes per 100g of roots respectively)
in Stargrass throughout the year. Criconemella sp., Hemicycliophorasp., Ditylenchus sp. and Xiphinema sp. were occasionally identified. In Smutgrass, Meloidogyne sp., Pratylenchus sp., Paratylenchus sp and non-parasitic nematodes were identified (2,56; 2,51; 3,47 y 3,53 log10 N° nematodes per 100g of roots respectively).The size of plant-arasitic nematode populations in the roots was surprisingly high. We also found Pratylenchus sp., Helicotylenchus sp. and non-parasitic nematodes in Setariagrass roots, with densities of 2,92, 2,02 and 3,57 log10 N° nematodes per 100g respectively. Finally, in Tannergrass, Pratylenchus sp., Helicotylenchus sp. and non-parasitic nematodes were present (3,99; 1,47 and 3,79 log10 N°. nematodes roots 100g respectively).


Plant parasites; dairy farm; forages; population density; grazing. RESUMEN: Las poblaciones de nemátodos pueden afectar la productividad en potreros de ganado. Cada 30 días durante los meses de enero 2004 y enero 2005 medimos las poblaciones de nematodos



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