Abstract
Entomopalynological study and physiological state of the "boll weevil" Anthonomus grandis Boh. (Coleoptera, Curculionidae) in Corrientes, Argentina. Feeding host of boll weevils were established by identifying pollen grains ingested by weevils captured from January until December of 1999. The insects were captured using pheromone traps. Survey was conducted in weevil infested areas of the province of Corrientes in routes that cross the departments of San Miguel, Ituzaingó and Santo Tomé. The feeding host are very important, since they may contribute to greater survival without cotton crops. About 346 individuals were dissected and some totals of 2,132 pollen grains from 15 species of plants were identified (e.g., Malvaceae, Compositae, Solanaceae and Euphorbiaceae). Cluster and correspondence analysis showed that weevil tended to feed on particular species at different seasons. The relationships among sampling dates: capture time, different reproductive stages, sex, and levels of magnitudes of abundance for individual, were analyzed using loglinear model. The statistical employee was the X 2 of Pearson with a level of rejection of the null hypothesis of P<0.01. Significant interactions were found among some the different variables. According to main results obtained a high percentage of the boll weevil individuals show appropriate physiological conditions for dispersion at long distances and for searching cotton fields where to continue their life cycle during the summer.
Highlights
Entomopalynologioal study and physiological state of the "boll weevil" Anthonomus grandie Boh. (Coleoptera, Cureulionidae) i n Corrientes, Argentina
Feeding host of boll weevils were established by identifyingpoilengrains ingested by weevils captured from
infested areas of the province of Corrientes in routes that cross the departments of San Miguel
Summary
- de picudo, fue tramsformado a log, para crear categorias por maigoitudesde ahundancia (Frontier, 1973).Fueron analizadoslas siguientesvariables: otoh. Las cinco especies que fueron excluidas,pertene- para determinar la significaci6nestadistiea de 1 cen a las familias Graminae, Cyperaceae, asociaciones entre las siguientes variables: ni Polygalaceae complejo Tipo Amaranthaceae- de ahundancia de polen, Bpoca de captura, esta. Los picudos disecados fueron 346 y so observaron pocas variaciones descartarse que a1 menus una parte de los picu- estacionales en el porcentaje do picudos que predos entren en este estado y Bsta sea la razbn del sentaron ingesta en las cnatro estaciones del Go. brusco descenso en las capturas de 10s meses de En otofio, invierno y primavera este porcentaje invierno; en primavera, cuando a ~ nno hay algo- estuvo cercano al 50% en cambio en el vcrano d6n disponible, pero ia disponibilidad de fue del27% (Cuadro 2). Polen como alrmento de Anthonornus grandas Boh. en Corrrentes, Argentma 343
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