Occurrence and parasitism of aphids (Hemiptera: Aphididae) on cultivars of irrigated oat (Avena spp.) in São Carlos, Brazil

Abstract

The interactions between aphids and their Hymenopteran parasitoids on irrigated oats as well as

Temporal genotypic diversity of Schizaphis graminum (Rondani 1852) (Hemiptera: Aphididae) in a black oats (Avena strigosa) field

“…Results showed evidence that genetic diversity of S. graminum could be small and temporally stable in oat fields. These findings are compatible with the report that populations of S. graminum on oats are very small in comparison with R. padi (Ronquim et al 2004). Taking in consideration the total genetic variation observed from several areas of Brazil (Lopes-da-Silva et al, 2004), it could be concluded that migration was not the most important source of genetic variability for S. graminum populations locally.…”

Aphid parasitoids (Hymenoptera, Braconidae, Aphidiinae) and their associations related to biological control in Brazil

“…São Borja, 16-IX-1980, Triticum aestivum, field, 80/25 (PS). SP: Ronquim et al (2004), Avena sativa ?…”

“…2002;Ronquim et al 2004;Zanini et al 2006), and still fewer were found on ornamentals (Peronti 1999;Imenes et al 2002;Carvalho et al 2006). Moreover, this information is scattered in the literature and a compilation of these data is necessary.…”

Responses of Cereal Aphids and Their Parasitic Wasps to Landscape Complexity

“…This implies that there is a different dynamic spatial and temporal relationship between aphids and their natural enemies in tropical and temperate zones. In Brazilian fields, most studies have investigated the occurrence of aphid parasitoids in a field by measuring the number of mummies (Ronquin et al 2004, Alves et al 2005, Macedo et al 2010). However, this method severely restricts the understanding of the behavior of these natural enemies in the field.…”