Comprasion of in vitro carboxylesterase inhibition in Bemisia tabaci (Genn.) (Hemiptera:Aleyrodidae) and Aphis gossypii Glover (Hemiptera: Aphididae) by allelochemical and some insecticides

Resumo. A presente pesquisa objetivou estudar a entomofauna associada ao cultivo comercial de quiabo, no Município de Canindé do São Francisco (SE), por meio de análise faunística. As espécies Bemisia tabaci (Gennadius) biótipo B, Aphis gossypii (Glover), Phenacoccus sp., Icerya purchasi (Maskell) e Lagria villosa (Fabricius) foram as principais pragas do quiabeiro neste estudo. Diabrotica speciosa (Germar) e Gryllus assimilis (Fabricius) foram pragas de importância secundária. Leptoglossus zonatus (Dallas), Nezara viridula L., Pachycoris torridus (Scopoli) e Oxycarenus hyalinipennis (Costa) foram pragas esporádicas. Foram encontradas quatro espécies de insetos predadores, sendo uma constante e dominante (Cycloneda sanguinea L.), uma dispersa, mas constante (Eriopis connexa German) e duas raras (Hippodamia convergens Guérin-Méneville e Psyllobora confluens F.). Insect Faunal Analysis Associated with the Commercial Cultivation of Okra [Abelmoschus esculentus (L.) Moench] in Canindé do São Francisco, SE, BrazilAbstract. This research aims to study the entomofauna associated with the commercial cultivation of okra in municipality of Canindé do São Francisco, Sergipe State, Brazil, through faunal analysis. The species Bemisia tabaci (Gennadius) biotype B, Aphis gossypii (Glover), Phenacoccus sp., Icerya purchasi (Maskell) and Lagria villosa (Fabricius) were the okra key pests. Diabrotica speciosa (Germar) and Gryllus assimilis (Fabricius) were plagues of secondary importance. And Leptoglossus zonatus (Dallas), Nezaraviridula L., Pachycoris torridus (Scopoli) and Oxycarenus hyalinipennis (Costa) were sporadic pests. Four species of predatory insects were found, a constant and dominant (Cycloneda sanguinea L.) a dispersed, but constant (Eriopis connexa German) and two rare (Hippodamia convergens Guérin-Méneville and Psyllobora confluens F.).

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Screen Hole Size and Barriers for Exclusion of Insect Pests of Glasshouse Crops

Journal of Entomological Science ◽

10.18474/0749-8004-26.1.169 ◽

1991 ◽

Vol 26 (1) ◽

pp. 169-177 ◽

Cited By ~ 39

Author(s):

James A. Bethke ◽

Timothy D. Paine

Keyword(s):

Bemisia Tabaci ◽

Myzus Persicae ◽

High Density Polyethylene ◽

Insect Pests ◽

Aphis Gossypii ◽

Liriomyza Trifolii ◽

Hole Size ◽

Aphis Gossypii Glover ◽

Hole Geometry ◽

Pass Through

Laboratory trials were conducted to determine the effectiveness of screens as barriers to five major greenhouse pests. Four screen types with a range of hole sizes were tested: high density polyethylene sheets perforated with holes that were in the center of an indentation on one side and a corolla of material on the opposite side; a woven mesh of polyethylene strands; a filter of unwoven polyester; and woven brass strainer cloth. Liriomyza trifolii (Burgess), Aphis gossypii Glover, Myzus persicae (Sulzer), Bemisia tabaci (Gennadius), or Frankiniella occidentalis (Pergande) were placed in a cage with a test screen separating them from a source of light and food. The insects' ability to pass through any barrier could not be predicted solely from thoracic width and hole size. Hole geometry or the way in which holes were formed were important elements in insects' exclusion. The most effective barriers to insect penetration correspondingly reduced air flow. The unwoven polyester filter designed specifically as an insect barrier did not restrain any of the insects under the methodology used. Results suggest that the maximum hole sizes for exclusion were: L. trifolii (640 μm), A. gossypii (341 μm), B. tabaci (462 μm) and F. occidentalis (192 μm).

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