| maize and oat antixenosis and antibiosis against delphacodes kuscheli (homoptera: delphacidae), vector of "mal de rio cuarto" of maize in argentina. | "mal de rio cuarto" (mrc) is the most important virus disease of maize, zea mays l., in argentina. several maize lines show different levels of resistance to mrc in the field; however, no studies have been conducted to investigate resistance mechanisms against its insect vector, delphacodes kuscheli fennah (homoptera: delphacidae). oat, avena spp., is the main overwintering host of d. kuscheli and main source of populations that infest maize. although oat varieties resistant to the greenbug, sch ... | 2005 | 16156593 |
| pathogenicity of fungal isolates (ascomycota: hypocreales) against peregrinus maidis, delphacodes kuscheli (hemiptera: delphacidae), and dalbulus maidis (hemiptera: cicadellidae), vectors of corn diseases. | preliminary screening assays were carried out on 17 isolates from five fungal species beauveria bassiana, lecanicillium muscarium, metarhizium anisopliae, isaria farinosa, and i. fumosorosea. the three most effective isolates against peregrinus maidis (hemiptera: delphacidae) were b. bassiana cep 147, cep 150, and cep 189. there were no consistent differences found in males and females regarding fungal susceptibility. however, more females than males were proportionally infected. there was not a ... | 2007 | 17407003 |
| wheat antixenosis, antibiosis, and tolerance to infestation by delphacodes kuscheli (hemiptera: delphacidae), a vector of "mal de río cuarto" in argentina. | "mal de rio cuarto", is the most important virus disease of corn, zea mays l., in argentina. it is caused by the mal de rio cuarto virus (family reoviridae, genus fijivirus. mrcv), which is a persistent virus transmitted by delphacodes kuscheli (fennah 1955) (hemiptera: delphacidae). because corn is not a natural host of d. kuscheli, it has little protection from this pest. in contrast, wheat, triticum aestivum l., is one of the main hosts of this vector and a reservoir of mrcv. the aim of this ... | 2009 | 19886444 |
| growth inhibition of beauveria bassiana by bacteria isolated from the cuticular surface of the corn leafhopper, dalbulus maidis and the planthopper, delphacodes kuscheli, two important vectors of maize pathogens. | abstract the phytosanitary importance of the corn leafhopper, dalbulus maidis (de long and wolcott) (hemiptera: cicadellidae) and the planthopper, delphacodes kuscheli fennah (hemiptera: delphacidae) lies in their ability to transmit phloem-associated plant pathogens, mainly viruses and mollicutes, and to cause considerable mechanical damage to corn plants during feeding and oviposition. fungi, particularly some members of the ascomycota, are likely candidates for biocontrol agents against these ... | 2011 | 21529147 |
| reference gene selection for gene expression studies using rt-qpcr in virus-infected planthoppers. | planthoppers not only severely affect crops by causing mechanical damage when feeding but are also vectors of several plant virus species. the analysis of gene expression in persistently infected planthoppers might unveil the molecular basis of viral transmission. quantitative real-time rt-pcr (rt-qpcr) is currently the most accurate and sensitive method used for quantitative gene expression analysis. in order to normalize the resulting quantitative data, reference genes with constant expression ... | 2011 | 21679431 |
| wolbachia occurrence in planthopper (hemiptera: delphacidae) vectors of cereal viruses in argentina. | maize (zea mays l.) and wheat (triticum aestivum l.) are the most important cereal crops for the argentinean economy and are affected by several diseases. different planthopper species transmit causal agents of some of those diseases, including mal de río cuarto virus, barley yellow striate mosaic virus, and the recently proposed maize yellow striate virus. many planthopper species are sap feeders and therefore are expected to host bacteria providing essential nutrients lacking in the diet. prev ... | 2015 | 26470291 |
| morphological and molecular characterization of a fungus, hirsutella sp., isolated from planthoppers and psocids in argentina. | a mycosed planthopper, oliarus dimidiatus berg (hemiptera: cixiidae), and two psocids, heterocaecilius sp. (psocodea: pseudocaeciliidae) and ectopsocus sp. (ectopsocidae), were collected from los hornos and la plata, buenos aires, argentina between february and september 2007. observations of mycelia growing on the host revealed that the putative fungal parasite had synnemata supporting monophialidic conidiogenous cells. likewise, in vitro fungal cultures presented characteristics typical of the ... | 2013 | 23885970 |
| co-infection with a wheat rhabdovirus causes a reduction in mal de río cuarto virus titer in its planthopper vector. | mal de río cuarto virus (mrcv, fijivirus, reoviridae) causes one of the most important diseases in maize (zea mays l.) in argentina and has been detected in mixed infections with a rhabdovirus closely related to maize yellow striate virus. in nature both viruses are able to infect maize and several grasses including wheat, and are transmitted in a persistent propagative manner by delphacodes kuscheli fennah (hemiptera: delphacidae). this work describes the interactions between mrcv and rhabdovir ... | 2017 | 28891462 |