| morphological comparisons between xiphinema rivesi daimasso and x. americanum cobb populations from the eastern united states. | though in the past xiphinema americanum has been the most commonly reported dagger nematode in the eastern united states, our studies revealed the presence in pennsvlvania of a previously unrecognized and unreported species related to x. americanum, morphometric data and photomicrographs establish the identity of this form as x. rivesi and show expected variations in populations of this species from various locations. similar data and illustrations are given for x. americanum populations from pe ... | 1982 | 19295745 |
| parasitism of xiphinema rivesi and x. americanum by zoosporic fungi. | living xiphinema americanum (xa) and x. rivesi (xr) extracted from soil samples and stored for 1-5 days at 4 or 20 c contained aseptate fungal hyphae. the fungi directly penetrated the nematode's cuticle from spores encysted near the head. penetration through the stoma, vulva, or anus was rare. catenaria anguillulae (cat), lagenidium caudatura (lag), aphanomyces sp. (aph), and leptolegnia sp. (lep) were isolated into pure culture from infected nematodes. the pathogenicity of these zoosporic fung ... | 1986 | 19294146 |
| occurrence of novel verrucomicrobial species, endosymbiotic and associated with parthenogenesis in xiphinema americanum-group species (nematoda, longidoridae). | numerous micro-organisms have been described as cytoplasmic symbionts of eukaryotes. many so-called obligate endosymbionts rely exclusively on maternal (vertical or transovarial) transmission to maintain themselves, rendering them dependent on the host sex ratio, which they would tend to manipulate to their own advantage. the latter phenomenon is often associated with the presence of wolbachia pipientis (alpha-proteobacteria) in arthropods and nematodes. a potentially similar situation was disco ... | 2000 | 11155997 |
| mitochondrial genome diversity in dagger and needle nematodes (nematoda: longidoridae). | dagger and needle nematodes included in the family longidoridae (viz. longidorus, paralongidorus, and xiphinema) are highly polyphagous plant-parasitic nematodes in wild and cultivated plants and some of them are plant-virus vectors (nepovirus). the mitochondrial (mt) genomes of the dagger and needle nematodes, xiphinema rivesi, xiphinema pachtaicum, longidorus vineacola and paralongidorus litoralis were sequenced in this study. the four circular mt genomes have an estimated size of 12.6, 12.5, ... | 2017 | 28150734 |