Distribution and movement of adult Diaprepes abbreviatus (Coleoptera: Curculionidae) in a Florida citrus grove

• Published in: The Florida entomologist 2001-12, Vol.84 (4), p.641-651
• Main Authors: Nigg, H.N, Simpson, S.E, Ramos, L.E, Tomerlin, T, Harrison, J.M, Cuyler, N
• Format: Article
• Language: English
• Subjects: adults; Beetles; Citrus; Citrus sinensis; Curculionidae; Diaprepes abbreviatus; dispersal; distance travelled; Entomology; gender differences; Groves; Infestation; Insect larvae; insect traps; Leaves; Malaise traps; mark-recapture studies; orchards; population distribution; Population distributions; Population estimates; regression; regression analysis; tedders traps; temporal variation; Umbrellas; Weevils
• ISSN: 0015-4040; 1938-5102
• DOI: 10.2307/3496396

Over 10 weeks, 765 adult, feral Díaprepes abbreviatus were captured from 750 young citrus trees by dislodging them into inverted umbrellas. Newly captured weevils were distributed evenly among plots throughout the experimental site. Five hundred eighty of these weevils were marked and released; 146 were recovered. Recaptured (marked) weevils tended to stay close to the release point. Because recaptured weevils were not homogenously distributed, a mark-release method for a population estimation was untenable. Weevils were recaptured at distances up to 120 m from the release point, the farthest distance checked. There were no differences between males and females in the numbers and distances moved. Marked females were recovered at the experimental site over a longer time period than marked males. Weevils were recaptured within 6 weeks of marking, but none after 6 weeks from first capture. Over the 10 week experimental period, Malaise and Tedders traps captured 0 and 2 weevils, respectively, compared to the 765 weevils captured with the beat method. Average adults per tree ranged from 0.016 to 0.376 per week with an overall average of 0.172±0.140, enough adult weevils to thoroughly infest all trees with larvae. /// Durante un período de 10 semanas, se recolectaron 765 ejemplares adultos del tipo silvestre de gorgojo Diaprepes abbreviatus, a partir de 750 árboles cítricos, para lo cual se agitaron los mismos, recogiéndose los individuos desprendidos en una sombrilla invertida. Los individuos recolectados se distribuyeron al azar en toda el area experimental. Quinientos cincuenta de los mismos fueron debidamente marcados para su posterior identificación y liberados a continuación; de éstos, 146 fueron recuperados, en la mayoria de los casos en las proximidades de los puntos en que fueron dejados en libertad. Teniendo en cuenta que los individuos recuperados no fueron distribuidos de forma homogénea, no es aplicable un metodo para el cálculo de la población a partir de los datos de marcado y liberación de los individuos. Los gorgojos fueron recapturados a distancias de mayores de 120 m de los puntos en que fueron liberados. No se encontraron diferencias entre individuos femeninos y masculinos en cuanto a las distancias que se desplazaron y el número de los mismos. Las hembras marcadas fueron recuperadas en los puntos experimentales al cabo de períodos mas prolongados que en el caso de los machos. Los gorgojos fueron recapturados en un plazo no mayor de seis sema