| dc.description.abstract | The occurrence of root weevils in the systems of production of soybeans has
shown a significant increase in the southern region of the country in the last decade,
however, there is little information about the species, its distribution and damage of
this group of insects in soybeans. This study aimed to identify the species of root
weevils associated with soybean, to study geographical distribution and develop an
identification key of species of adult root weevils in Rio Grande do Sul. The survey of
the occurrence and geographical distribution of root weevils was conducted in
commercial soybean plantations of 55 municipalities of Rio Grande do Sul, during the
agricultural harvest 2011/12. In each location / municipality, 15 points per farming
were sampled, using the sampling method of insect net. The collected samples were
placed in plastic containers containing 70% alcohol and sent to the laboratory, for
later identification, quantification and assembly of entomological collection. After the
identification, the occurrence of 12 species of weevils roots associated with soybean
in RS was recorded, belonging to four genera. The genus Naupactus had the highest
number of insects, totaling 9 species. Naupactus cervinus was the species that
occurred in more locations, being found in 22 municipalities in the RS, distributed in
all regions of leguminous production in the state. The species of root weevils
presented in the key of identification are: Aramigus conirostris (Hustache),
Atrichonotus sordidus (Hustache), Naupactus alternevittattus Hustache, Naupactus
ambiguus Boheman, Naupactus cervinus Boheman, Naupactus cinerosus Boheman,
Naupactus leucoloma Boheman, Naupactus minor (Buchanan), Naupactus
peregrinus Buchanan, Naupactus purpureoviolaceus Hustache, Naupactus
tremolerasi Hustache and Pantomorus viridisquamosus (Boheman). | |
