Ocorrência de pragas em algodoeiro geneticamente modificado (Bt) e convencional

The study aimed to evaluate the occurrence of pest and management of cotton genetically modified with the introduction of the bacterium Bacillus thunringiensis compared to conventional cotton in the 'Cerrado' region, installing the field experiment in 2007/2008 in Chapadão do Sul-MS. The experimental design was randomized blocks in a 2 × 3 factorial, with two managements of insecticides (with and without insecticides to control lepidopteran) and 3 modes of use of cultivars: 100% transgenic (NUOPAL), 100% non transgenic (Deltaopal) and interior area with transgenic (80% NUOPAL) with non-transgenic border (20% Deltaopal) with five replications. Evaluations were performed weekly of pest infestation, observing in 15 plants per plot the number of Alabama argillacea, Heliothis virescens and Spodoptera frugiperda. Based on these results it was concluded that: the occurrence of A. argillacea and H. virescens was lower in treated transgenic cultivar. There were no differences between transgenic and conventional farming on the occurrence of S. frugiperda.

Insect/Bt-cotton interactions: Are immunological variables and hemocyte ultrastructure in Podisus nigrispinus (Hemiptera: Pentatomidae) affected?

Recent studies have shown that ingestion by the army worm Spodoptera frugiperda of Cry1Ac toxin from Bt cotton promotes histochemical and ultrastructural changes in the digestive cells of the predatory pentatomid bug Podisus nigrispinus. Therefore, mindful of the changes in the midgut of the predator, which represents the first line of defence in this insect, our aim was to test the hypothesis that the consumption of Bt cotton-fed S. frugiperda by P. nigrispinus might lead to alterations in components of the immune system of P. nigrispinus. The Cry1Ac toxin level in the leaves of Bt cotton, nitric oxide, phenoloxidase activity, and total proteins were quantified by ELISA. Total and differential hemocyte counts were evaluated, and hemocyte ultrastructure analysis was undertaken. We found that ingestion of the prey fed daily with approximately 23 ± 0.70 ng g-1 Cry1Ac by wet weight of leaves, and expressed by the Bt cotton, induces small ultrastructural changes in the predator's granulocytes and plasmatocytes. However, these changes did not affect the total number and differential and humoral variables analyzed for the bug's hemocytes. © 2013 Copyright Taylor and Francis Group, LLC.

Mini-inversores para aproveitamento de energia fotovoltaica, com técnicas de MPPT, sincronismo e conexão com a rede de CA em BT, proteção de ilhamento, gerenciamento da energia e da operação

Pós-graduação em Engenharia Elétrica - FEIS

Ocorrência de pragas e custo de produção em algodoeiro geneticamente modificado (Bt) e convencional

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Ocorrência de pragas na cultura do algodão transgênico (bt) e convencional cultivado no sistema adensado e não-adensado

Pós-graduação em Agronomia - FEIS

Taxonomia e diversidade de Encarsi no Brasil e a biologia de Bemisia tabaci biótipo B e seu parasitoide Encarsia desantisi em algodoeiro Bt e não Bt

Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

Estabelecimento do capim-massai em consórcio com milho AG-1051 e Bt, em áreas infestadas pelo percevejo castanho das raízes.

The system consortium of grain crops with forage plants allows the establishment of pastures resistant, vigorous and lower cost in areas infested with stink bug brown root. Maize has favorable characteristics for intercropping as high plant height and insertion height of the studs, allowing the crop to occur without interference of forage plants. Furthermore, the production system in consortium with Bt corn reduced the infestation of Spodoptera frugiperda and was not affected by Scaptocoris carvalhoi (Hemiptera: Cydnidae), The Panicum maximum cv. Massai allowed a consortium with excellent corn and pasture provided a vigorous and excellent leaf mass distribution and very deep roots in the soil. Grain yield for Bt corn was higher and significant (P <0.05), compared to other treatments. The use of Lorsban (1.5 liters / ha) and Thiodan (2.0 liters / ha) was highly effective (P <0.05) in the control of Spodoptera frugiperda and Scaptocoris carvalhoi (Hemiptera: Cydnidae).