Spatial and Probability Distribution of Mexican Bean Beetle (Coleoptera: Coccinellidae) Egg Mass Populations in Dry Bean

Barrigossi, J. A. F.; Young, Linda J.; Crawford, Carol A. Gotway; Hein, Gary L.; Higley, Leon G.

doi:10.1603/0046-225x-30.2.244

Cited by 30 publications

(20 citation statements)

References 19 publications

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“…Já, pela forte dependência espacial verificada, estudos futuros sobre as geometrias de amostragem devem ser realizados a fim de se estabelecer o melhor grid e as adequadas distâncias entre os pontos de amostragem, de modo a tornar mais eficiente o atual método de monitoramento. Comprova-se ainda a aplicabilidade da geoestatística e da elaboração de mapas de distribuição espacial, importantes subsídios para o conhecimento do comportamento do inseto e que podem auxiliar no seu manejo integrado, permitindo ações localizadas (BARRIGOSSI et al, 2002), minimizando custos de produção e risco de contaminações ambientais associados ao uso de inseticidas (FARIAS et al, 2003).…”

Section: Resultsunclassified

“…A Geoestatística é uma importante ferramenta para esse tipo de determinação, pois considera o valor da observação e a sua localização na estimativa da correlação entre os pontos de amostragem (BARRIGOSSI et al, 2002). Nessa perspectiva, com este trabalho, objetivou-se definir a distribuição espacial de T. limbativentris e aperfeiçoar o método de amostragem por meio da aplicação de técnicas geoestatísticas e construção de mapas de predição em arrozal irrigado por inundação, no Planalto da Campanha do Rio Grande do Sul, onde predomina o cultivo do cereal também sobre as taipas, condição que potencializa os danos do inseto.…”

Section: Introductionunclassified

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Geostatistics applied to the study of the spatial distribution of Tibraca limbativentris in flooded rice fields

et al. 2015

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Tibraca limbativentris (rice stem bug) is an insect highly injurious to the rice crop in Brazil. The aim of this research was to define the spatial distribution of the T. limbativentris and improve the sampling process by means of geostatistical application techniques and construction of prediction maps in a flooded rice field located in the "Planalto da Campanha" Region, Rio Grande do Sul (RS), Brazil. The experiments were conducted in rice crop in the municipality of Itaqui - RS, in the crop years of 2009/10, 2010/11 and 2011/12, counting fortnightly the number of nymphs and adults in a georeferenced grid with points spaced at 50m in the first year and in 10m in the another years. It was performed a geostatistical analysis by means adjusting semivariogram and interpolation of numeric data by kriging to verify the spatial dependence and the subsequent mapping population. The results obtained indicated that the rice stem bug, T. limbativentris, has a strong spatial dependence. The prediction maps allow estimating population density of the pest and visualization of the spatial distribution in flooded rice fields, enabling the improvement of the traditional method of sampling for rice stem bug

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Section: Resultsunclassified

Section: Introductionunclassified

Geostatistics applied to the study of the spatial distribution of Tibraca limbativentris in flooded rice fields

et al. 2015

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“…In contrast, geostatistics is a branch of applied statistics in which both the values and locations of samples are used to describe and model spatial patterns (Isaaks & Srivastava 1989, Liebhold et al 1996. These methods were originally developed for geological applications, but recently there has been considerable interest in their application to biological problems (Darnell et al 1999, Barrigossi et al 2001, Farias et al 2002a. Geostatistical methodology applied to entomology is primarily based on the work of Liebhold et al (1993) and Roberts et al (1993).…”

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confidence: 99%

Spatial analysis of the distribution of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) and losses in maize crop productivity using geostatistics

Farias¹,

Barbosa²,

Busoli³

et al. 2008

Neotrop. entomol.

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Analise da Distribuição Espacial da Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) e Dano da Produtividade na Cultura do Milho Usando Geoestatística RESUMO -A lagarta-do-cartucho, Spodoptera frugiperda (J.E. Smith), é uma das principais pragas do milho nas Américas. O estudo de sua distribuição espacial é fundamental para a utilização de estratégias de controle, otimização de técnicas de amostragens, determinação de danos econômicos e incorporação de um programa de agricultura de precisão. Em uma área cultivada com milho foram realizadas amostragens com intervalo semanal, correspondendo ao estádio vegetativo que compreende desde a germinação até o pendoamento. Foram amostradas 10 plantas ao acaso por parcela, no total de 2000 plantas em cada amostragem. A produtividade foi obtida através da colheita de todas as parcelas que eram pesadas separadamente no campo e em cada parcela foram coletadas 15 espigas aleatoriamente para estimar o comprimento e o diâmetro médio. As análises espaciais, utilizando geoestatística, mostraram que o modelo esférico apresentou o melhor ajuste às lagartas pequenas. À medida que as lagartas foram se desenvolvendo sua distribuição foi tornando aleatória, representada por um modelo ajustado por uma reta, não tendo sido detectado nenhum tipo de dependência espacial nos pontos de amostragem. A produtividade e o diâmetro e comprimento da espiga foram descritos por modelos esféricos, indicando uma variabilidade espacial nos parâmetros de produtividade na área cultivada. A geoestatística mostrou-se promissora para a aplicação de métodos precisos no controle integrado de pragas. PALAVRAS-CHAVE:Zea mays, lagarta-do-cartucho, semivariograma, krigagem ABSTRACT -The fall armyworm, Spodoptera frugiperda (J.E. Smith), is one of the chief pests of maize in the Americas. The study of its spatial distribution is fundamental for designing correct control strategies, improving sampling methods, determining actual and potential crop losses, and adopting precise agricultural techniques. In São Paulo state, Brazil, a maize fi eld was sampled at weekly intervals, from germination through harvest, for caterpillar densities, using quadrates. In each of 200 quadrates, 10 plants were sampled per week. Harvest weights were obtained in the fi eld for each quadrate, and ear diameters and lengths were also sampled (15 ears per quadrate) and used to estimate potential productivity of the quadrate. Geostatistical analyses of caterpillar densities showed greatest ranges for small caterpillars when semivariograms were adjusted for a spherical model that showed greatest fi t. As the caterpillars developed in the fi eld, their spatial distribution became increasingly random, as shown by a model adjusted to a straight line, indicating a lack of spatial dependence among samples. Harvest weight and ear length followed the spherical model, indicating the existence of spatial variability of the production parameters in the maize fi eld. Geostatistics shows promise for the application of precise methods in the inte...

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“…The Mexican bean beetle, Epilachna varivestis Mulsant (Coleoptera: Coccinellidae), is native to the plateau region of southern Mexico and is an important pest of snap bean (Phaseolus vulgaris L.), soybean (Glycine max Merill), and lima bean (P. lunatus L.), causing serious economic losses in many production geographical areas of Mexico and the United States (Schaafsma and Ablett 1994;Barrigossi et al 2001;Pinto et al 2002;Sánchez-Arroyo 2007). Adults overwinter on the mountains and/or nearby bean fields in which larvae development takes place.…”

Section: Introductionmentioning

confidence: 99%

Susceptibility of the Mexican bean beetle Epilachna varivestis Mulsant (Coleoptera: Coccinellidae) to endemic isolates of Beauveria bassiana (Balsamo) Vuillemin (Hypocreales: Clavicipitaceae)

et al. 2011

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Entomopathogenic fungi represent excellent candidates for biological insecticides. Among the many entomopathogenic fungi, Beauveria bassiana (Balsamo) Vuillemin (Hypocreales: Clavicipitaceae) is one of the most promising species. Here, we report the results of infection studies performed using four B. bassiana native isolates (Bb37, Bb38, Bb40, and Bb45) compared with the commercial product Mycotrol Ò (strain GHA) on adult Mexican bean beetle Epilachna varivestis Mulsant (Coleoptera: Coccinellidae), one of the most important pests of bean production in Mexico. First, single concentration (1 9 10 8 conidia mL -1 ) assays were carried out using all isolates applied using an immersion method. Examinations at 10 days after inoculation indicated that isolates Bb37, Bb38, and Bb40 significantly reduced adult survival, causing 60-75% mortality compared to the commercial strain GHA (33%) and control (29%). Second, using two selected isolates (Bb37 and Bb40), the mean lethal concentration values (LC 50 ) were estimated for third instar larvae and adult E. varivestis. The LC 50 values for Bb37 and Bb40 isolates decreased 5.26-fold and 3.19-fold, respectively, in third instars compared with adults. However, such difference for Bb40 isolate was not significant. Finally, an experiment, to compare the median survival time (MST) values between third instar and adult E. varivestis, was conducted using Bb37 and Bb40 at 1 9 10 9 conidia mL -1 . MST values were significantly reduced against larvae (87 and 100 h) compared with adults (130 and 134 h) by Bb37 and Bb40, respectively. We conclude that native isolates of B. bassiana represent an important alternative for the control of E. varivestis. However, to demonstrate its effectiveness under field conditions, detailed studies are needed.

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Spatial and Probability Distribution of Mexican Bean Beetle (Coleoptera: Coccinellidae) Egg Mass Populations in Dry Bean

Cited by 30 publications

References 19 publications

Geostatistics applied to the study of the spatial distribution of Tibraca limbativentris in flooded rice fields

Geostatistics applied to the study of the spatial distribution of Tibraca limbativentris in flooded rice fields

Spatial analysis of the distribution of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) and losses in maize crop productivity using geostatistics

Susceptibility of the Mexican bean beetle Epilachna varivestis Mulsant (Coleoptera: Coccinellidae) to endemic isolates of Beauveria bassiana (Balsamo) Vuillemin (Hypocreales: Clavicipitaceae)

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