Examinando por Materia "Insectos fitófagos"

Mostrando 1 - 2 de 2
  • Miniatura
    PublicaciónAcceso abierto
    Bioecology of Epilachna difficilis (Coleoptera: Coccinellidae: Epilachninae) in Central-West of Mexico.
    (Universidad del Valle, 2017-06-30) Garcia Segura, Jonas; Cortez Madrigal, Hipolito; Marin Jarillo, Antonio; Angoa Pérez, Maria Valentina; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle
    Epilachna difficilis was reported for the first time on Bonplandia geminiflora (Polemoniaceae). To study the biological and ecological aspects of this species, samples were taken weekly in 2011 in “La Gloria” Canyon, Sahuayo, Michoacán, México, and complementary studies were conducted in the laboratory. The first occurrence of E. difficilis was observed in mid-August and the last in early December. Defoliation to B. geminiflora ranged from 38.0-98.5 %. Six species of predators, viz., Podisus congrex, Podisus brevispinus, Oplomus dichrous, Oplomus pulcher (Hemiptera: Pentatomidae: Asopinae), Pselliopus nigropictus, and Rocconota sp. (Hemiptera: Reduviidae), were recorded. Temperature and precipitation were positively correlated (r = 0.8 and 0.6, respectively) with higher population peaks. However, E. difficilis showed a wide range of adaptability in different regions and climates where its host plants grow. Under laboratory conditions, five instars were recorded during 25.95 days of larval development; the entire lifecycle was completed in 37.8 ± 1.7 days. Of the five crops species evaluated, only cucumber suffered damage (30.0 %) by adult insects, although all insects died thereafter. This is the first bio-ecological study of E. difficilis. Results may be useful in the biological control of related pests such as E. varivestis.
  • Miniatura
    PublicaciónAcceso abierto
    Seasonal variation of the epigeal coleopteran diversity in the Laguna Carén (Santiago, Chile).
    (Universidad del Valle, 2018-12-31) Alvarado Orellana, Alexandra; Huerta Fuentes, Amanda; Palma Muñoz, Álvaro; Rodríguez Tobar, Sebastián; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    The seasonal variation of epigeal coleopteran diversity and physical-chemical parameters associated to water quality in the Laguna Carén (Santiago, Chile) was evaluated. Different physical-chemical parameters of lagoon water were measured in spring and summer at four random sampling stations, representative of the vegetable coverages. The epigeal coleopterans of the shore were collected by means of interception traps (n = 40), installed at random. It was estimated the abundance and richness of the coleopterans by sampling station and season. In addition, they were separated into trophic guilds: phytophagous, predatory and saprophagous. The differences in abundance and richness were evaluated with nonparametric Kruskal-Wallis tests, followed by Dunn (sampling station) and Mann-Whitney (season) tests. The same statistical procedure was applied to trophic guilds. The ensemble of species of epigeal coleopteran was represented by 19 species (14 natives) from eight families, constitutes the first record of insects in the lagoon. The richness of epigeal coleopteran was significantly higher in spring; while abundance was in summer, concurring with the sampling stations with higher coverages. The availability of food and shelter for epigeal beetles would be influenced mainly by anthropic factors, which lead to a greater degree of fragmentation and alteration of the habitat. The information generated can serve as a basis for future research on bioindicators in vulnerable wetlands in the Mediterranean region.