Biodiversidad de parasitoides en huevos de Tibraca limbativentris Stal, 1860 en el cultivo de arroz (Oryza sativa L.) en el cantón Babahoyo, Los Ríos

The objective of this study was to evaluate the biodiversity of parasitoids in eggs of T. limbativentri (Stal, 1860) in rice (O. sativa L) in Babahoyo, Los Ríos. The research was carried out in two phases: field and laboratory. Fifty egg clutches of T. limbativentris (Stal, 1860) were collected from rice plants at the beginning of tillering, maximum tillering and swarming stages. Eggs were collected in three rice-growing areas of Babahoyo canton: Palmar, Los Silos and Recinto San Vicente. The collected egg postures were taken to the Entomology Laboratory of the Faculty of Agricultural Sciences of the UTB, where they were incubated in Petri dishes with moistened cotton until the parasitoids were expected to emerge. For the analysis of the number of hosts and diversity of parasitoids, an analysis using descriptive statistics was applied after identification. Through the results obtained, it was determined that in the rice zones: Los Silos, Palmar and San Vicente of Babahoyo canton, the number of eggs collected was 1589 (n = 50 postures), with an average posture of 520.82 ± 71. 66, with a parasitism percentage of 2.89 %, in which the total number of parasitoids identified were: Trisssoclus sp. with 47.83 % (n = 22), followed by Telenomus sp. with 26.09 % (n = 12) and the Eulophidae family with 26.09 % (n = 12). The parasitoid Trisssoclus sp. (Ashmead, 1893) exerted significant parasitism on T. limbativentri eggs compared to Telenomus sp. (Haliday, 1833) and the family Eulophidae (Westwood, 1829) in the evaluated areas.

The objective of this study was to evaluate the biodiversity of parasitoids in eggs of T. limbativentri (Stal, 1860) in rice (O. sativa L) in Babahoyo, Los Ríos. The research was carried out in two phases: field and laboratory. Fifty egg clutches of T. limbativentris (Stal, 1860) were collected from rice plants at the beginning of tillering, maximum tillering and swarming stages. Eggs were collected in three rice-growing areas of Babahoyo canton: Palmar, Los Silos and Recinto San Vicente. The collected egg postures were taken to the Entomology Laboratory of the Faculty of Agricultural Sciences of the UTB, where they were incubated in Petri dishes with moistened cotton until the parasitoids were expected to emerge. For the analysis of the number of hosts and diversity of parasitoids, an analysis using descriptive statistics was applied after identification. Through the results obtained, it was determined that in the rice zones: Los Silos, Palmar and San Vicente of Babahoyo canton, the number of eggs collected was 1589 (n = 50 postures), with an average posture of 520.82 ± 71. 66, with a parasitism percentage of 2.89 %, in which the total number of parasitoids identified were: Trisssoclus sp. with 47.83 % (n = 22), followed by Telenomus sp. with 26.09 % (n = 12) and the Eulophidae family with 26.09 % (n = 12). The parasitoid Trisssoclus sp. (Ashmead, 1893) exerted significant parasitism on T. limbativentri eggs compared to Telenomus sp. (Haliday, 1833) and the family Eulophidae (Westwood, 1829) in the evaluated areas.

El presente estudio tuvo como objetivo evaluar la biodiversidad de parasitoides en huevos de T. limbativentri (Stal,1860) en el cultivo de arroz (O. sativa L) en el cantón Babahoyo, Los Ríos. La investigación se realizó en dos fases: campo y laboratorio. Se recolectaron 50 posturas de huevos de T. limbativentris (Stal,1860) en plantas de arroz en etapa de inicio de macollamiento, máximo macollamiento y embuchamiento. La recolección de las posturas se la realizó en tres zonas arroceras del cantón Babahoyo tales como: Palmar, Los Silos y Recinto San Vicente. Las posturas de huevos recolectadas fueron llevadas al Laboratorio de Entomología de la Facultad de Ciencias Agropecuarias de la UTB, donde se las incubo en cajas de Petri con algodón humedecido hasta que se esperó la emergencia de los parasitoides. Para análisis del número de hospederos y diversidad de parasitoides se aplicó posterior a la identificación un análisis mediante el uso de estadística descriptiva. Mediante los resultados obtenidos se determinó que en las zonas arroceras: Los Silos, Palmar y San Vicente del cantón Babahoyo, el número de huevos recolectados fueron 1589 (n = 50 posturas), los mismos que presentaron postura media de 520.82 ± 71.66, con un porcentaje de parasitismo de 2.89 %, en la cual la cantidad total de parasitoides identificados fueron: Trisssoclus sp. con el 47.83 % (n = 22), seguido de Telenomus sp. con el 26.09 % (n = 12) y la familia Eulophidae con el 26.09 % (n = 12). El parasitoide Trisssoclus sp. (Ashmead, 1893) ejerció un parasitismo significativo sobre los huevos de T. limbativentri en comparación con Telenomus sp. (Haliday, 1833) y la familia Eulophidae (Westwood, 1829) en las zonas evaluadas.