En los bosques de Ixtlán de Juárez se detectó un brote inusual de mosca sierra (Hymenoptera: Diprionidae), por lo que este trabajo tiene como objetivo identificar taxónomicamente a la especie afectante y estimar su densidad y ciclo de vida. La identificación se basó en la observación de especímenes adultos de ambos sexos, siguiendo las claves taxonómicas desarrolladas por David R. Smith y colaboradores. La densidad de capullos se evaluó en 10 sitios, dentro de los que se seleccionó al azar un árbol, a partir del cual, se establecieron tres cuadrantes de muestreo de 1 m2, ubicados a 1 m, 2 m y 3 m de distancia del fuste. El ciclo de vida de la mosca se determinó con información obtenida en campo y laboratorio, dando seguimiento a los capullos recolectados. Se determinó y registró a Zadiprion howdeni como defoliador de pinos en la región de estudio. La densidad promedio de capullos por metro cuadrado fue de 37.92 ± 8.63/m2, con diferencias significativas entre parcelas. No se encontraron diferencias significativas en la cantidad promedio de capullos por metro cuadrado respecto a la distancia del árbol, sin embargo, se observaron diferencias significativas en la cantidad de capullos por unidad de superficie entre machos y hembras. La etapa más larga del ciclo de vida de la mosca es como capullo y la etapa más sensitiva es como adulta. Se brindan estrategias de control para cada etapa de vida y se recomienda continuar con el estudio biológico y ecológico para consolidar las estrategias de manejo de Z. howdeni.
A survey of psocopterans in the Zapotitlán Salinas Valley, Puebla, was conducted from October 1994 to October 1995. A total of 582 specimens were collected, representing 25 species, belonging to 15 genera and 8 families (18.38% of the species recorded in the state of Puebla). Six species constitute 67% of the total of specimens collected, and 9 species represent 3.4% of the same total. Twelve species were associated to thorn scrub, 16 were found on izotal, and 6 species were found on Bursera spp. trees. It was found that both richness of species and relative abundance are related to the rainfall regime of the area (r= 0.595 and r= 0.739, respectively).
Three species of Lachesilla, in species group rufa, from the Sierra Tarahumara, Chihuahua, Mexico, are here described and illustrated: L. byei n. sp., L. furthi n. sp., and L. raramuri n. sp. Two of them belong in Subgroup IIb of the species group, one showing affinities with L. sommermanae García Aldrete and L. yakima Mockford & García Aldrete, the second one showing affinity with L. salamana García Aldrete. The third species belongs in Subgroup I of the species group, showing affinities with L. aspera García Aldrete and L. chiricahua García Aldrete. The especies here described raise to seven the number of species of Lachesilla in the Sierra Tarahumara.
Three species of Goja Navás collected in the mountain communities of Santa Catarina Lachatao, Ixtlán de Juárez and Santiago Comaltepec, are here described and illustrated. All of them are endemic to Sierra Juárez, Oaxaca. This report increases the number of species described in the genus to 33 and the number of species recorded in Mexico to 25. G. garcialdretei is similar to G. martinezi Casasola-González & García Aldrete, another species that also occurs in the same region. G. cuspidata and G. bicuspidata are similar species on account of their phallosome, but are quite distinct on wing venation
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