El anillador de la guayaba es un lepidóptero recientemente identificado como Carmenta theobromae que ha causado pérdidas significativas en cultivos de guayaba de la Provincia de Vélez, Santander. El objetivo de esta investigación consistió en estudiar los estados de huevo y larva del anillador en campo y laboratorio durante el primer semestre de 2014. En campo, los sitios de oviposición se describieron en árboles barrenados y, en laboratorio, se examinaron las posturas en cortezas del tallo de guayaba. Se evaluó la supervivencia y duración del estado larval de inmaduros recolectados en campo en cuatro dietas semi-artificiales: aserrín de guayabo, dos dietas formuladas para Spodoptera frugiperda y otra para Synanthedon pictipes. Se describieron las características morfométricas del huevo y la larva con especímenes recolectados en cultivos de guayaba. Los sitios de oviposición se encontraron en la corteza principalmente del tallo donde las posturas fueron simples, espaciadas y de forma oblonga o elipsoidal. No se encontraron diferencias estadísticas en los tratamientos supervivencia y duración del estado larval. La duración promedio de la fase larval fue de 13,92 ± 1,36 días para individuos con longitud mayor a 10,63 ± 0,31 mm. El huevo midió 0,22 ± 0,012 mm de ancho y 0,37 ± 0,011 mm de longitud. Se identificaron cuatro estadios larvales a través del coeficiente de Dyar y distribución de frecuencias de medidas del ancho cefálico. La larva madura tiene ganchos (“crochets”) distribuidos uniordinalmente y un par de bandas en el pronoto como C. theobromae, barrenador de cacao en Venezuela.

The aim of this research was to study the effect of climatic conditions on the population of the grass bug Collaria scenica (Stal, 1859) using agroclimatic models and analyzing its behavior under interannual variability scenarios related to El Niño-Southern Oscillation (ENSO) events. The population fluctuations of this grass bug were modeled, estimating significant climatic variables in the presence of nymphs and adults with a multiple linear regression analysis. The population distribution of this insect in relation to the occurrence of the El Niño and La Niña phenomena on the Bogota plateau was analyzed based on variations of the sea surface temperature (SST) in the tropical Pacific and their impact on climate variables. The maximum and minimum temperatures, precipitation and evapotranspiration showed higher significance for this pest than the other variables. The optimal growth and development conditions for this grass bug occurred during periods with a higher daily thermal amplitude and high precipitation values, which highlights the positive effect of abundant, but not excessive, rain. This study helped to determine the population growth during the two seasons of the year with higher rainfall in the area, which correspond to March-May (MAM) and September-November (SON), mainly in the following season after the dry quarter of December-February (DJF). Important increases occur in the El Niño event because of the greater accumulation of heat units during this phenomenon based on increases in air temperature that favor insect growth.

Eight species of the family Miridae found in Colombian pastures belong to four genera: Collaria, Cynodonmiris, Neotropicomiris and Stenodema. All species are included in the tribe Stenodemini and are associated with Poaceae grasses. Diagnosis, keys to species and genera, and distribution in Colombian regions as well as the principal host of these species are presented. Habitus and male genital structures illustrations for each species are provided to facilitate their recognition.

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The authors propose a new synonym between Collaria scenica (senior synonym) and Collaria columbiensis (junior synonym) based on external morphology and genitalia characteristics of male and female adults of both species. There was no significant difference found to believe that they are two different species.