Nolberto L. Arismendi

Learn More
In Chile, phytoplasmas have been reported in sugar beet, grapevine, peony, and Chilean shrubs. 'Candidatus Phytoplasma ulmi' have been detected in plants of Ugni molinae Turczanínow (Myrtaceae) and the leafhopper Amplicephalus curtulus Linnavuori & DeLong. We evaluated the possibility of phytoplasma transmission from native plants to grasses by A. curtulus(More)
Neozygites osornensis is a recently described aphid pathogen characterized by morphological criteria and compared with two morphologically close taxa, Neozygites cinarae and Neozygites turbinata. Neozygites species are traditionally classified based on morphological characteristics and molecular data that would confirm these taxa and permit investigation of(More)
Color sticky traps are one of the main alternatives to collect insect vectors, as they are easy to handle and are inexpensive. We aimed to compare the effect of color and height of the traps on the attractiveness to potential cicadellids vectors of plant pathogens. Yellow and green colored stick traps were placed at two different heights in plant of(More)
‘Candidatus Phytoplasma ulmi’ (Elm yellows, 16SrV-A), transmitted by Amplicephalus curtulus Linnavuori & DeLong (Hemiptera: Cicadellidae), has been found in native Chilean plants, and transovarial transmission has been considered as a possible form of transmission. An analysis to detect the presence of ‘Ca. Phytoplasma ulmi’ and other phytoplasmas in A.(More)
The 4',6-diamidino-2-phenylindole (DAPI) stain technique is a simple method that was developed for confirming the presence of phytoplasmas in hand-cut or freezing microtome sections of infected tissues. DAPI binds AT-rich DNA preferentially, so that phytoplasmas, localized among phloem cells, can be visualized in a fluorescence microscope. The procedure is(More)
The cypress aphid (Cinara cupressi) is listed among the hundred most important invasive pests in the world. In Chile, it was first detected in 2003 and currently is present throughout the country. In the course of a survey of their natural enemies in Chile, three strains of entomopathogenic fungi were isolated. The isolates were identified and tested(More)
The process of pass-through and multiplication of phytoplasma in host-insect tissues could cause some pathogenic effects in insect vectors and may increase the susceptibility to some insecticides. We propose that ‘Candidatus phytoplasma ulmi'-infected Amplicephalus curtulus had reduced cytochrome P450 (P450s) activity compared with uninfected leafhoppers.(More)
  • 1