Examinando por Materia "Larvae"

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  • Miniatura
    PublicaciónAcceso abierto
    Assessment of the influence of Escherichia coli on the immature stages of Aedes aegypti (Diptera: Culicidae) in Girardot, Colombia.
    (Universidad del Valle, 2017-06-30) Garay Gutiérrez, Lina Marcela; Pinilla Agudelo, Gabriel; García Sánchez, Diana Carolina; Quintero Espinosa, Juliana; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle
    Bacterial populations are common in water, especially in ponds and sewage in urban and rural areas.Their abundance seems to affect the presence of some immature aquatic insects.This study aimed to establish the relationship between immature Aedes aegypti states and the presence of Escherichia coli in drinking water reservoirs in the city of Girardot, Colombia. Therefore, a random sampling of 30 water containers in different houses, half of them with the presence of different quantities of immature Ae. aegypti, was made. In all cases, samples were taken in order to make direct counts of E. coli in 3MTM PetrifilmTM Aqua. Nonparametric statistical tests were performed to determine differences and to correlate bacterial populations and vectors. It was found that there is a significant relationship between the number of CFU ml-1 of E. coli and the abundance of immature Ae. aegypti. It was established that there were differences in bacterial abundances between deposits with low, moderate, and high amounts of immature mosquitoes. It was verified that the increase in the number of larvae and pupae of the vector was higher as water samples had higher amounts of E. coli.
  • Miniatura
    PublicaciónAcceso abierto
    Virulence of blastospores of Isaria fumosorosea natives of northeastern Mexico on Anastrepha ludens (Diptera: Tephritidae).
    (Universidad del Valle, 2018-12-31) Gandarilla Pacheco, Fatima Lizeth; Elías Santos, Myriam; Flores González, María del Socorro; Luna Santillana, Erick de Jesús de; Quintero Zapata, Isela; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    Anastrepha ludens is one of the pests that seriously affects fruit production in Mexico and other Neotropical countries. The aim of this study was to evaluate the virulence and effects of four native isolates and a collected strain of Isaria fumosorosea on the metamorphosis of A. ludens through the use of bioassays under laboratory conditions [25 ± 2 °C; 60 ± 5 % (HR); 12:12 h (L: O)]. Larvae and pupae were exposed to 1 × 108 blastospores/ ml using two different methods: direct spraying and spraying of soil. The isolates HIB-23 and HIB-30 showed the highest mortality on A. ludens when applied using the direct spraying method on larvae (84 %), while the isolate HIB-19 showed the highest percentage of interruption of the metamorphosis (43 %) of A. ludens when applied through the method of direct spraying on pupae. The results show that A. ludens is susceptible to the attack of I. fumosorosea, which causes the disruption of its life cycle.