The neotropical stink bug Euschistus heros is the predominant and most important insect pest affecting soybean cultivation. Knowledge of the spatial pattern of the pest in an area is critical to understanding its behavior. The objective of this work was to study the spatial distribution of E. heros in transgenic soybean cultivars of different maturing cycles. The experiments were conducted in the seasons 2013/14 and 2014/15 in FCAV/UNESP, Jaboticabal, SP. Three fields were selected, and each was marked an area of 8.000 m 2 (0.8 ha), with each area divided into 80 portions of 100 m 2 (10 m x 10 m). The transgenic soybean cultivars of different maturing cycles were: SYN 1365 RR (early), M 7908 RR (average), and BRS Valiosa RR (late). Samples were taken weekly using a beat sheet, registering the number of nymphs and adults of E. heros. To study the dispersion of E. heros, the following indices were used: variance/ mean ratio, Morisita index, Green coefficient, and the exponent k of the negative binomial distribution. For studies of special distribution models of E. heros, adjustments of Poisson distribution and negative binomial distribution were tested. The spatial distribution of nymphs and adults was aggregated for all the cultivars studied, indicating that cultivars did not alter the distribution behavior of E. heros. Key words: Glycine max (L.). Behavioral ecology. Dispersion. Negative binomial distribution. Neotropical brown stink bug. ResumoO percevejo-marrom-da-soja Euschistus heros, destaca-se como o inseto-praga predominante e mais importante na cultura. O conhecimento do padrão espacial da praga na área é fundamental para o entendimento do seu comportamento. O objetivo do presente trabalho foi estudar a distribuição espacial de E. heros em cultivares de soja transgênica de diferentes ciclos de desenvolvimento.

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Among pest insects that attack soybean crops, Chrysodeixis includens (Walker, 1858) (Lepidoptera: Noctuidae) looper caterpillar deserves attention due to its key pest status in soybean crops. The spatial distribution of C. includens eggs should be investigated in order to understand the behavior of this species in the area. The aim of this study was to investigate the spatial distribution of C. includens eggs in soybean crops. The experiment was conducted with SYN 9070 RR soybean variety in an experimental area of the Teaching, Research and Extension Farm (FEPE) of FCAV/ UNESP, Jaboticabal, SP, Brazil. The area of 0.6 ha was divided into 60 equidistant plots of 100 m² each. For the study of the spatial distribution of P. includens eggs in the area, the following dispersion indexes were used: variance / mean ratio (I), Morisita index (Id), Green coefficient (Cx), k exponent of the negative binomial distribution for each sampling. Regarding the probabilistic models that describe the spatial distribution of a given variable, the data adjustment to the Poisson and negative binomial distributions was tested. According to values obtained for dispersion indexes, egg distribution occurred in an aggregate way, and the negative binomial distribution was the most appropriate probabilistic model to represent the distribution of C. includens eggs in the study area.

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RESUMO: Mesmo para culturas mais estudadas como a soja, a dúvida em relação a aplicar ou não N na semeadura ainda persiste. No caso do amendoim, com a introdução de novas cultivares de alta produtividade, há necessidade de definir se esta estratégia de manejo deve ser recomendada ou não. O

________________________________________________________________________________ ResumoO objetivo do presente trabalho foi definir a dose de N em cobertura necessária para o maior desenvolvimento da cultura da alface crespa, cultivar Vanda. Realizou-se cinco tratamentos, doses de N aplicados em cobertura (0, 30, 60, 90 e 120 kg ha -1 ), e quatro repetições, fornecidas em doses iguais aos 10, 20, 30 dias após o transplante (DAT). A colheita foi realizada aos 60 DAT onde avaliaram-se: número de folhas, altura da planta, largura da folha, comprimento da folha, largura da planta, diâmetro do caule e produtividade total. A dose de 98,5 kg ha -1 de N na adubação de cobertura proporcionou melhor desenvolvimento na cultura da alface cultivada a campo. Palavras-chaves: Lactuca sativa L., nitrogênio, nutrição de plantas AbstractThe objective of the present work was to define the dose of N in the necessary cover to the greater development of the cultivated Vanda cultivar. Five treatments, doses of N applied in a cover (0, 30, 60, 90 and 120 kg ha -1 ) and four replicates, were given in equal doses at 10, 20, 30 days after transplantation (DAT). Harvest was carried out at 60 DAT where they evaluated: leaf number, plant height, leaf width, leaf length, plant width, stem diameter and total productivity. The 98.5 kg ha -1 dose of N in cover fertilization provided a better development in field cultivated lettuce.