Spatial distribution of Rhynchophorus palmarum L. (Coleoptera: Curculionidae) in oil palm, Roraima State, Brazil

Abstract

Oil palm (Elaeis guineensis Jacq.) is an African palm that is distinguished by its elevated oil production per unit area, however, fitossanitary problems are one of its the main drawbacks. Thus, this study aimed to evaluate the spatial distribution pattern of the Rhynchophorus palmarum (L) (Coleoptera: Curculionidae) in oil palm plantations with geo-statistical procedures in the south of the state of Roraima, Brazil. The 25 ha of experimental area is located in the municilaity of São João da Baliza, RR, where 24 samples were carried out in the period from September 2013 to August 2014. For the insects collection, a buckettype trap with food attractant (sugarcane) was placed in each one of the 100 sampling points. Analyses of spatial variability and spatial dependence were held by the incorporation of geo-statistical procedures based on spatial modeling techniques by semivariagrams. The spatial distribution of the R. palmarum is aggregated with spatial dependence described by the spherical model, forming clusters of 100 to 210 m radius. It was observed that R. palmarum infestation takes place both in the center just as on the edges of the plantation, with later dissemination to the entire area. The maximum range found in the study was of 210 m, with an area of influence of 13.9 ha.

Perspectives for Synergic Blends of Attractive Sources in South American Palm Weevil Mass Trapping: Waiting for the Red Palm Weevil Brazil Invasion

“…Behavioral control using aggregation pheromones enforced with food lures and ethyl acetate in mass trapping devices [ 3 , 43 , 70 , 74 ] propitiates the management, allowing a more confident use of insecticides.…”

“…Attractiveness tests using the aggregation pheromone, 6-methyl-2 (E)-heptane-4-ol, associated with sugar cane stalks, pineapple fruit pieces, and six isolated volatile compounds of pineapple fruits, demonstrated that they do not show significant differences in the number of weevils captured [ 3 ]. A similar study [ 90 ] suggested that a combination of sugarcane with the aggregation pheromone increased the attraction of R. palmarum males and females toward traps, demonstrating the appearance of the synergy between these attractive sources.…”

“…A better knowledge of both Tachinidae lifecycle and host acceptation will tell if they can serve in the inundative biological control of all Rhynchophorus , pest species. Parasitoidism can join other control methods to enforce the management efficacy and minimize the actual R. palmarum impact [ 2 , 3 ].…”

“…The South American palm weevil (SAPW), Rhynchophorus palmarum (Linneaus 1764), and the red palm weevil (RPW), Rhynchophorus ferrugineus (Oliver, 1790), are well-known, relevant pest species worldwide [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Today, SAPW and RPW are the key invasive pests [ 13 , 14 ] of cultivated palms (Arecales: Arecaceae) in the old and new world.…”

Costo-beneficio del trampeo y fluctuación poblacional de Rhynchophorus palmarum L. en genotipos de coco (Cocos nucifera L.)

“…The black palm weevil, Rhynchophorus palmarum L. (Coleoptera: Curculionidae), is the most important pest in coconut (Cocos nucifera L.), date palm (Phoenix dactylifera L.) and oil palm (Elaesis guineensis Jacq.) plantations in the Americas (Rodríguez-Currea, Marulanda-López, & Amaya, 2017;Silva-Dionisio et al, 2020). The insect's distribution ranges from southeastern California and Texas to Argentina, Paraguay, Uruguay, and Bolivia (Aldana de la Torre, Aldana de la Torre, & Moya, 2010;Oehlschlager, Chinchilla, Castillo, & González, 2002).…”