The fall armyworm, Spodoptera frugiperda (J. E. Smith)(Lepidoptera: Noctuidae), is an important agricultural pest of the Western Hemisphere noted for its broad host range, long distance flight capabilities, and a propensity to develop resistance to pesticides that includes a subset of those used in genetically modified corn varieties. These characteristics exacerbate the threat fall armyworm poses to agriculture, with the potential that a resistance trait arising in one geographical location could rapidly disseminate throughout the hemisphere. A region of particular concern is the Caribbean, where a line of islands that extends from Florida to Venezuela provides a potential migratory pathway between populations from North and South America that could allow for consistent and substantial genetic interactions. In this study, surveys of populations from Peru, Bolivia, Paraguay, and Trinidad & Tobago expand on previous work in South America that indicates a generally homogeneous population with respect to haplotype markers. This population differs from that found in most of the Lesser Antilles where a combination of genetic and meteorological observations is described that indicate fall armyworm migration from Puerto Rico to as far south as Barbados, but does not support significant incursion into Trinidad & Tobago and South America. Air transport projections demonstrate that the wind patterns in the Caribbean region are not conducive to consistent flight along the north-south orientation of the Lesser Antilles, supporting the conclusion that such migration is minor and sporadic, providing few opportunities for genetic exchanges. The implications of these findings on the dissemination of deleterious traits between the two Western Hemisphere continents are discussed.

En el presente trabajo, se evaluó la araneofauna durante todo el periodo fenológico del cultivo de algodón, utilizando dos técnicas de muestreo (búsqueda directa y trampas de caída). Se registraron 2304 individuos, agrupados en 50 especies y 18 familias. Las arañas estuvieron presentes durante todo el periodo del cultivo, relacionándose positivamente a su desarrollo fenológico, y donde las prácticas agronómicas, la temperatura y humedad no fueron influyentes en su abundancia, excepto por la cosecha, actividad que sí influenció negativamente sus poblaciones.

ResumenEl presente estudio tuvo como objetivo identificar las especies de insectos Miridae (Hemiptera) presentes en seis cultivos tropicales en la selva del Departamento de Junín, Perú. Se considera como base las recolecciones realizadas entre los años 1983 a 1987. El muestreo se basó en colectas periódicas semanales de insectos en las plantaciones de cafeto (Coffea arabica L.), papayo (Carica papaya L.), piña (Ananas comosus var. comosus (L.) Merr., Coppens & Leal), palto (Persea americana Mill), cítricos (Citrus aurantium L.) y plátano (Musa paradisiaca L.). Los insectos fueron colectados en campo sobre los cultivos y la hierba mediante aspiradores de succión, redes entomológicas aéreas y de golpe. Los especímenes capturados fueron remitidos al Museo de Entomología "Klaus Raven Büller" de la Universidad Nacional Agraria La Molina, para su montaje y determinación. Las determinaciones de las especies se realizaron con la colaboración de expertos del Museo Nacional de Rio de Janeiro, Brasil. En los resultados de este trabajo se establece la identificación de 55 especies de Miridae de las cuales siete fueron descritas como nuevas. Palabras clave: Miridae, Hemiptera, fundo Génova, fundo Santa Teresa, Chanchamayo, Satipo. AbstractThis study aimed to record and identify the species of plant bugs Miridae (Hemiptera) present in six tropical crops in the rainforest of the Department of Junín, Peru. Sampling was conducted from 1983 to 1987 in the following crops: coffee (Coffea arabica L.), papaya (Carica papaya L.), pineapple (Ananas comosus var. Comosus (L.) Merr., Coppens & Leal), avocado (Persea americana Mill), citrus (Citrus aurantium L.) and banana (Musa paradisiaca L.). The specimens collected in the field were sent to the "Klaus Raven Büller" Museum of Entomology at the Universidad Nacional Agraria La Molina, for mounting and identification. Species determination were carried out with the collaboration of experts at the National Museum of Rio de Janeiro, Brazil. We report 55 species of plant bugs which included 7 new described species.

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