| genetic diversity of hevea irrdb'81 collection assessed by rapd markers. | the majority of hevea (hevea brasiliensis muell. arg.) genetic resource in vietnam derived from the irrdb'81 germplasm collected in the amazonian habitats of the genus. random amplified polymorphic dna (rapd) analysis was used to examine the genetic diversity and structure of the irrdb'81 germplasm. a total of 59 accessions from 13 different districts of the brazilian states namely acre, rondonia, and mato grosso were brought into the study using six arbitrarily preselected primers. sixty-five r ... | 2009 | 19288228 |
| effect of air humidity on the egg viability of predatory mites (acari: phytoseiidae, stigmaeidae) common on rubber trees in brazil. | rubber pest mites, calacarus heveae and tenuipalpus heveae, reach economic damage levels at the end of the rainy season and the beginning of the dry season in brazil. therefore, low humidity adaptation might be an important characteristic for predatory mites to successfully control pest organisms. this study determined the effect of the relative humidity (rh) levels of 30-100% on the hatching of larvae of amblyseius acalyphus, euseius citrifolius, iphiseiodes zuluagai, metaseiulus camelliae, agi ... | 2006 | 16550332 |
| [influence of cerrado fragments in the distribution of mites in rubber tree crop]. | the aim of this study was to verify whether fragments of cerrado influence the composition of the mite fauna on rubber trees. five transects distant 50 m, being the first in the edge near the native areas and the last 200 m inside the crop, were established in each rubber tree crop in southern state of mato grosso. in each transect five plants were chosen, and seven leaves were collected from each plant. during one year, 25 quantitative samplings were conducted in two rubber tree crops. the lowe ... | 2008 | 18506301 |