Amostragem seqüencial (presença-ausência) para Bemisia tabaci (Genn.) biótipo B (Hemiptera: Aleyrodidae) em feijoeiro (Phaseolus vulgaris L.)

Pereira, Marcelo Francisco Arantes; Boiça, Arlindo Leal; Barbosa, José Carlos

doi:10.1590/s1519-566x2004000400016

Cited by 7 publications

(6 citation statements)

References 12 publications

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“…In Douradina index I had four samples with statistically higher values than unity (aggregate score) and two values equal to unity indicating uniform (Table 1) theoretical distribution. Pereira et al (2004) studied the population of pests in legumes and found regular or uniform distribution of individuals in the population sampled.…”

Section: Resultsmentioning

confidence: 99%

Spatial Distribution of Adults and Nymphs of Euschistus heros (F.) (Hemiptera: Pentatomidae) on Bt and Non-Bt Soybean

Fonseca

Fernandes²,

Justiniano³

et al. 2014

JAS

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The knowledge of the arrangements of dispersion of insect pests in soybean cultivars is needed to improve the monitoring and control. The objective of this study was to evaluate the spatial distribution of adults and nymphs of Euschistus heros in Bt and non-Bt soybean into two regions, under field conditions. The experimental area located in Dourados and Douradina, Mato Grosso do Sul. For the evaluations we used the method of cloth-to-beat, where we collected one sample per plot randomly from each experimental area. Evaluations were performed at 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98 days after emergence (DAE). For data analysis, the rates of dispersion (variance/average Morisita index and exponent k  Negative Binomial Distribution) and theoretical frequency distributions (Poisson, Binomial and Negative Binomial Positive) were estimated at 1-5 % probability. Adults of E. heros are arranged differently for Bt and non-Bt soybean and between regions, since in both cultivars and locations, individuals of the populations evaluated in probabilistic set arrangements negative binomial distribution (aggregate), Poisson (random) and positive binomial distribution (uniform), as the days after soybean emergence. The nymphs of E. heros showed aggregated spatial arrangement, being distributed similarly for Bt and non-Bt soybean and regions, setting a negative binomial distribution model.

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Section: Resultsmentioning

confidence: 99%

Spatial Distribution of Adults and Nymphs of Euschistus heros (F.) (Hemiptera: Pentatomidae) on Bt and Non-Bt Soybean

Fonseca

Fernandes²,

Justiniano³

et al. 2014

JAS

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“…The third leaflet from top to bottom (apical third) of each plant was evaluated by direct counting (Naranjo and Flint, 1995;Pereira et al, 2004). Leaves were handled with care, and the nymphs and adults of B. tabaci were counted.…”

Section: Methodsmentioning

confidence: 99%

Population fluctuation and distribution of bemisia tabaci MEAM1 (Hemiptera: Aleyrodidae) in soybean crops

Rodrigues¹,

Silva²,

Silva³

et al. 2022

Front. Agron.

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Studies on the spatiotemporal dynamics of crop pests enable the determination of their colonization pattern and dispersion in the landscape. Geostatistics is an efficient tool to determine the spatial distribution pattern of the pest in the crops and to visualize them in appropriate maps. Analysis of these maps across the crop developmental stages can be a helpful tool in precision agriculture programs. The aim of this study was to determine the spatiotemporal distribution of Bemisia tabaci whitefly adults and nymphs in commercial soybean crops from planting to harvest. Infestation by the whitefly adults and nymphs started between 30 and 50 days after plant emergence. The maximum population density of ten adults per plant and two nymphs per leaf occurred between 90 and 101 days after plant emergence. In Kriging maps, it was possible to observe the distribution pattern for both adults and nymphs. The colonization of soybean plants by B. tabaci may be divided into three stages: beginning infestation (at the outermost parts of the crop), whole area colonization, and dispersion colonization (when the whole crop area is infested). The density of adult insects was positively correlated with rainfall and relative humidity. Wind speed positively affected the dispersion of adult whiteflies. The distribution pattern of B. tabaci in the soybean crop was aggregated. Climatic factors, such as wind speed, increase the dispersion radius of the whitefly in the crop. Contribution to the field.

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“…Para a amostragem de ovos e de ninfas de B. tabaci, biótipo B coletou-se um folíolo no segundo par de folhas a partir do ápice das plantas de cada uma das seis plantas amostradas (PEREIRA et. al., 2004).…”

Section: Methodsunclassified

DINÂMICA POPULACIONAL DE Bemisia Tabaci BIÓTIPO B (GENNADIUS, 1889) EM CULTIVARES DE SOJA TRANSGÊNICA

Oliveira

Carneiro

Toscano

et al. 2018

Rev. Agric. Neotrop.

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A ocorrência de pragas é apontada como um dos principais fatores que causam perdas de produtividade na cultura da soja. A mosca-branca Bemisia tabaci biótipo B tem preocupado os sojicultores da região Centro-Oeste devido aos diversos danos causados. Com o uso cada vez maior de plantas com tecnologia Bt sendo implantadas nessas áreas, ainda são escassos estudos do impacto dessa tecnologia em pragas não-alvo. Objetivou-se, neste trabalho, avaliar a dinâmica populacional de B. tabaci biótipo B, em diferentes cultivares de soja transgênica e relacioná-las com cultivares de soja convencional, verificando o impacto do uso da tecnologia Bt sobre a sua população. O experimento foi realizado em blocos ao acaso, com quatro tratamentos e cinco repetições. Os tratamentos foram constituídos pelas cultivares BRS 7980, NS 9280, NS 7000 IPRO e NS 7300 IPRO. A dinâmica populacional foi determinada através de amostragens semanais, realizando contagens diretas de ovos, ninfas e adultos de mosca-branca em folíolos coletados e avaliados em laboratório. Não houve diferenças significativas entre as cultivares para números de ovos, ninfas e adultos em todas as avaliações devido à semelhança de pilosidade entre as cultivares. Concluiu-se que a cultivar NS 7000 foi a menos preferida para oviposição e a alimentação por Bemisia tabaci biótipo B é diretamente influenciada pela pilosidade das folhas na cultura da soja, ignorando a tecnologia presente na planta.

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Amostragem seqüencial (presença-ausência) para Bemisia tabaci (Genn.) biótipo B (Hemiptera: Aleyrodidae) em feijoeiro (Phaseolus vulgaris L.)

Cited by 7 publications

References 12 publications

Spatial Distribution of Adults and Nymphs of Euschistus heros (F.) (Hemiptera: Pentatomidae) on Bt and Non-Bt Soybean

Spatial Distribution of Adults and Nymphs of Euschistus heros (F.) (Hemiptera: Pentatomidae) on Bt and Non-Bt Soybean

Population fluctuation and distribution of bemisia tabaci MEAM1 (Hemiptera: Aleyrodidae) in soybean crops

DINÂMICA POPULACIONAL DE Bemisia Tabaci BIÓTIPO B (GENNADIUS, 1889) EM CULTIVARES DE SOJA TRANSGÊNICA

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