| phylogenetic position of the yeast-like symbiotes of tagosodes orizicolus (homoptera: delphacidae) based on 18s ribosomal dna partial sequences. | tagosodes orizicolus muir (homoptera: delphacidae), the endemic delphacid species of tropical america carries yeast-like symbiotes (yls) in the abdominal fat bodies and the ovarial tissues, like other rice planthoppers of asia. these yls are obligate symbiotes, which are transmitted transovarially, and maintain a mutualistic relationship with the insect host. this characteristic has made in vitro culture and classification of yls rather difficult using conventional methods. nevertheless, microor ... | 2004 | 17361570 |
| genetic diversity of costa rican populations of the rice planthopper tagosodes orizicolus (homoptera: delphacidae). | tagosodes orizicolus (homoptera: delphacidae) is one of the main constraints of the rice production in the neotropics. this planthopper produces severe damages as a phloem feeder, causes mechanical injury during oviposition and vectors the rice hoja blanca virus (rhbv). the main objective of this study was to determine the genetic diversity of t. orizicolus populations from three rice growing regions of costa rica, using rapds. individuals from guanacaste, parrita, san carlos and cali-colombia, ... | 2004 | 17361572 |
| a reliable bioassay procedure to evaluate per os toxicity of bacillus thuringiensis strains against the rice delphacid, tagosodes orizicolus (homoptera: delphacidae). | a reliable bioassay procedure was developed to test ingested bacillus thuringiensis (bt) toxins on the rice delphacid tagosodes orizicolus. initially, several colonies were established under greenhouse conditions, using rice plants to nurture the insect. for the bioassay, an in vitro feeding system was developed for third to fourth instar nymphs. insects were fed through parafilm membranes on sugar (10 % sucrose) and honey bee (1:48 vol/vol) solutions, observing a natural mortality of 10-15 % an ... | 2007 | 19069752 |
| 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 |
| major qtls control resistance to rice hoja blanca virus and its vector tagosodes orizicolus. | rice hoja blanca (white leaf) disease can cause severe yield losses in rice in the americas. the disease is caused by the rice hoja blanca virus (rhbv), which is transmitted by the planthopper vector tagosodes orizicolus. because classical breeding schemes for this disease rely on expensive, time-consuming screenings, there is a need for alternatives such as marker-aided selection. the varieties fedearroz 2000 and fedearroz 50, which are resistant to rhbv and to the feeding damage caused by t. o ... | 2014 | 24240781 |
| mechanisms of oryza sativa (poaceae) resistance to tagosodes orizicolus (homoptera: delphacidae) under greenhouse condition in venezuela. | tagosodes orizicolus is one of the main plagues of rice in tropical america causing two types of damages, the direct one, feeding and oviposition effect, and an indirect one, by the transmission of the "rice hoja blanca virus". during 2006-2007 we carried out research under greenhouse conditions at fundaci6n danac, venezuela, in order to determine the mechanisms of antixenosis, antibiosis and tolerance to t. orizicolus, which could be acting in commercial varieties and advanced lines of the rice ... | 2012 | 22458212 |