RESUMO:Compreender as formas de sobrevivência dos insetos em períodos desfavoráveis e sua relação com plantas e suas respectivas estruturas morfológicas é fundamental para o manejo integrado de pragas. O trabalho teve por objetivo avaliar a densidade populacional de percevejos da espécie Dichelops furcatus em plantas de Andropogon bicornis e Erianthus angustifolium e avaliar a influência do diâmetro destas plantas sobre a população de percevejos presente. O experimento foi realizado no município de Palmeira das Missões-RS, onde durante a entressafra de soja e milho foram amostradas 100 plantas hospedeiras, 50 de A. bicornis e 50 de E. angustifolium, subdivididas em cinco diferentes diâmetros de touceira (10, 20, 30, 40 e 50 centímetros). Plantas de A. bicornis tiveram maiores populações que E. angustifolium. O diâmetro da planta hospedeira tem influência direta sobre a população de pentatomídeos fitófagos da espécie D. furcatus. ABSTRACT: Understanding insect survival forms in unfavorable periods and their relationship with plants and their respective morphological structures is fundamental to integrated pest management. The objective of this work was to evaluate the population density of Dichelops furcatus bugs in Andropogon bicornis and Erianthus angustifolium plants and to evaluate the influence of the diameter of these plants on the present bed bug population. The experiment was carried out in the municipality of Palmeira dasMissões-RS, where they were sampled during soybean and maize offseason 100 host plants, 50 A. bicornis and 50 E. angustifolium were subdivided into 5 different diameters (10, 20, 30, 40 and 50 centimeters
The objective of this work was to evaluate the fluctuation and population density of different families of insects by means of attractive food based on oleoresins and sugars in an area under soybean-oat succession. The experiment was carried out in the municipality of Cruz Alta, RS, according to Koppen type Cfa. During the months of March to September, 9 traps were installed with the alimentary attraction around an area of 10.5 hectares, the samplings in the traps were realized every two weeks, being the number of insects belonging to each family accounted for and used for data analysis. The families identified were Curculionidae, Scarabaeidae, Coccinellidae, Noctuidae, Apidae, Chrysomelidae, Syrphidae, Tenebrionidae, Chrysopidae and Pentatomidae. Among the most populous are: Curculionidae, Scarabaeidae and Noctuidae. The Bootstrap estimators (10.75), Jackknife 1 (10.07) and Chao 2 (9.44) indicated proximity between the number of families observed (10) and estimated only for the Jackknife 2 estimator (13.95), there were more families. The soybean-oat succession provides a population increase of herbivores to the detriment of natural enemies. Food-attractive traps based on oleoresins and sugars serve to monitor local entomofauna in areas of soybeans and oats in succession. RESUMO:O trabalho teve por objetivo avaliar a flutuação e densidade populacional de diferentes famílias de insetos por meio de atrativo alimentar à base de oleoresinas e açúcares em área cultivada na sucessão soja-aveia. O experimento foi realizado no município de Cruz Alta, RS, de acordo com Koppen do tipo Cfa. Durante os meses de março a setembro foram instaladas 9 armadilhas com o atrativo alimentar no entorno de uma área de 10,5 hectares, as amostragens nas armadilhas foram realizadas a cada duas semanas, sendo o número de insetos pertencentes a cada família contabilizados e utilizados para análise de dados. As famílias identificadas foram Curculionidae, Scarabaeidae, Coccinellidae, Noctuidae, Apidae, Chrysomelidae, Syrphidae, Tenebrionidae, Chrysopidae e Pentatomidae. Sendo das mais populosas: Curculionidae, Scarabaeidae e Noctuidae. Os estimadores de riqueza Bootstrap (10,75), Jackknife 1 (10,07) e Chao 2 (9,44) indicaram proximidade entre o número de famílias observadas (10) e estimadas; apenas para o estimador Jackknife 2 (13,95) verificou-se maior número de famílias. A sucessão soja-aveia propicia aumento populacional de herbívoros em detrimento dos inimigos naturais. Armadilhas com atrativo alimentar à base de oleoresinas e açúcares servem para o monitoramento da entomofauna local em áreas de soja e aveia em sucessão. Contribuição dos autores:Eduardo Engel realizou o experimento, análise de dados, revisão bibliográfica, escrita científica e apresentação dos resultados; Sabrina Lago Dalla Nora realizou o experimento, revisão bibliográfica, revisão ortográfica e apresentação dos resultados; Mauricio Paulo Batistella Pasini contribuiu com a escrita científica, análise de dados, apresentação dos resultados e revisão gramatical; Daniele Car...
Kriging is a method that estimates values in places not sampled from different interpolators, therefore, widely used to predict the spatial distribution of organisms. However, the different interpolators may vary in performance depending on the organism under study or the area evaluated. The aimed study to compare the ordinary kriging and inverse of distance weighted interpolation methods, applied to the spatial distribution of population density of Tibraca limbativentris in irrigated rice. This study was carried out in Santa Maria, RS, Brazil, in two fields with areas of 1.3 ha and 6.2 ha, respectively. Seven evaluations of the population density of T. limbativentris were carried out, corresponding to the period from sowing to maturation. In these areas the adults of T. limbativentris were quantified and the sum used for the statistical and geostatistical analysis. The sample population of T. limbativentris was submitted to different semivariograms, which were selected through cross-validation. The sample population of T. limbativentris was submitted to different semivariograms, selected by means of cross-validation. Once selected, semivariograms were used in both tested interpolation methods. From the results it was concluded that the ordinary kriging interpolation method performed better in all evaluations performed in both areas. Therefore, we recommend its use for estimating the population density and spatial distribution of T. limbativentris in the HIGHLIGHTS Tibraca limbativentris is one of the main pests on rice crops. Its spatial distribution pattern can be studied using a geostatistical approach. There was variation in the T. limbativentris spatial structure according to rice phenology. The ordinary kriging interpolator performed better in predicting its populations.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.