Examinando por Materia "Neotropical region"

Mostrando 1 - 4 de 4
  • Miniatura
    PublicaciónAcceso abierto
    Efectos letales y subletales luego de exposición a insecticidas convencionales y biorracionales sobre huevos de Chrysoperla externa (Neuroptera: Chrysopidae).
    (Universidad del Valle, 2017-12-30) Haramboure, Marina
    The neuropteran Chrysoperla externa is a generalist predator of many important agricultural pests in the Neotropical region. It occurs on several agricultural crops, and therefore it can be affected by pesticides. Here, the lethal and sublethal effects of conventional and biorational insecticides were assessed against C. externa eggs. The exposure method consisted on immersion of eggs in solutions with the maximum field recommended concentration of 25 mg a.i./L cypermethrin, 200 mg a.i./L acetamiprid, 40 mg a.i./L azadirachtin and 75 mg a.i./L pyriproxyfen. The viability of the eggs was not affected, but 100 % of the neonates from eggs treated with cypermethrin died after 48 h. Larvae from eggs treated with acetamiprid, azadirachtin and pyriproxyfen survived to the adult stage, with survival rates of 75 %, 70.6 % and 84.6 %, respectively. Regarding the reproductive parameters, the preoviposition period was not affected but the fecundity and fertility were lower with acetamiprid and pyriproxyfen, showing the sublethal effects of the insecticides acting in the adult stage.
  • Miniatura
    PublicaciónAcceso abierto
    First record of bugs (Hemiptera: Coreidae and Pentatomidae) attacking pecan tree fruit in Brazil.
    (Universidad del Valle, 2016-06-30) Boscardin, Jardel; Correa Costa, Ervandil; Pedron, Leandra; Nascimento Machado, Dayanna Do; Maus Da Silva, Jéssica; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle
    Leptoglossus stigma, Leptoglossus zonatus (Hemiptera: Coreidae) and Loxa deducta (Hemiptera: Pentatomidae), have been found attacking Carya illinoinensis (Junglandaceae) fruit, in two 10-year-old plantings, located in areas in the city of Paraíso do Sul, Rio Grande do Sul, Brazil. The record was made in March, 2014, concerning the species from genus Leptoglossus and, in March, 2015, Loxa deducta. This represents, therefore, the first record of these Coreidae and Pentatomidae species bugs-feed on pecan tree fruit in the country.
  • Miniatura
    PublicaciónAcceso abierto
    First record of the genus Lithophorus (Coleoptera: Bothrideridae) to Colombia and L. ornatus to South America.
    (Universidad del Valle, 2016-12-30) Forero Avellaneda, Santiago; Amarillo Suárez, Ángela R.; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle
    The genus Lithophorus (Coleoptera: Bothrideridae) has previously been recorded in several countries in the Americas but not in Colombia. This study reports the finding of this genus with the species Lithophorus ornatus in Colombia for the first time. The species constitutes also a new record for South America.
  • Miniatura
    PublicaciónAcceso abierto
    Termite (Isoptera) survey in urban area in Northern of Rio de Janeiro State, Brazil.
    (Universidad del Valle, 2019-08-30) Gazal, Vinícius; Bailez, Omar; Viana Bailez, Ana Maria; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    Most pest termites in urban areas in Brazil are exotic species, but native species are becoming an increasing problem. This study aimed to identify termite species infesting trees and houses in urban areas of Campos dos Goytacazes, in the north of Rio de Janeiro State. Trees in the streets of sixteen neighborhoods were inspected for termites. Inspections and interviews were also conducted to verify the occurrence of termites in houses. Termites were recorded in 17 % of the 1,307 trees surveyed. Coptotermes gestroi was the most frequent species (51% of infested trees), Nasutitermes corniger and Microcerotermes strunckii were present in 38 % and 14 % of infested trees, respectively, and Microcerotermes arboreus was the least common (1 %). Different termite species coexisted in 14 % of the infested trees (n = 31). Termite infestations were recorded in 26% of the surveyed households (n = 1,020). Four species were identified as causing damage: Cryptotermes brevis, C. gestroi, N. corniger, and M. strunckii. The most common species was C. brevis, affecting 133 residences (51 %). C. gestroi and N. corniger were less frequent, but they were responsible for more structural damage than C. brevis, which mainly attacked furniture.