Associations between phytophagous nematodes and weeds in Argentina
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Abstract
Weeds in general are directly responsible for serious damage in agriculture. Indirectly, they can be hosts and transmit a large number of phytopathogenous organisms. Among these, certain phytophagous nematodes are very important. They find numerous weed species that offer them the possibility of remaining in the soil, affecting its sanitary conditions and crop yields. For the first time in Argentina, a comprehensive study of the nematodes-weed relationships was made. Fourteen valid phytophagous nematode species and two non-identified ones were detected associated with weeds. Three nematode genera that have very dangerous species (Ditylenchus, Meloidogyne, and Nacobbus) are characterized by their association with many weeds. A large variety of weeds (forty-five valid species and nine non-identified ones) that have a wide distribution in the cultivated area of the country are associated with one or more phytophagous nematode species. Gramineae and Compositae are the most important families.
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