Comparisons of control action thresholds for Heliothis armigera, Bemisia tabaci and Aphis gossypii on cotton in the Sudan Gezira and Rahad regions

1994 ◽  
Vol 13 (7) ◽  
pp. 503-512 ◽  
Author(s):  
P.A. Stam ◽  
A.A. Abdelrahman ◽  
B. Munir
Keyword(s):  
Bemisia Tabaci ◽  
Aphis Gossypii ◽  
Heliothis Armigera ◽  
Control Action ◽  
Action Thresholds ◽  
Sudan Gezira

scholarly journals The Role of Soil Amendments on Population Dynamics of Insect Pests, Growth Parameters and Yield of Eggplant, Solanum melongena (L.) Moench

2017 ◽  
Vol 7 (1) ◽  
pp. 7
Author(s):  
P. K. Baidoo ◽  
M. B. Mochiah ◽  
D. Asare ◽  
A. A. Sefah
Keyword(s):  
Soil Fertility ◽  
Plant Height ◽  
Bemisia Tabaci ◽  
Insect Pests ◽  
Soil Amendments ◽  
Aphis Gossypii ◽  
Solanum Melongena ◽  
Cow Dung ◽  
Leucinodes Orbonalis ◽  
Number Of Leaves

Loss of soil fertility as a result of continuous cropping on the same piece of land has necessitated the need to improve soil fertility for better crop yields. Inorganic and organic fertilizers have been used to improve soil fertility, however, excessive use of soil amendments improve vegetative growth of plants thereby attracting large numbers of insect pests. Cow dung and poultry droppings were used as soil amendments in a field experiment using eggplant Solanum melongena. The effects of these organic manures were compared with inorganic fertilizer (NPK) and a control where there was no application of soil amendment in a randomized complete block design with 3 replicates. Parameters studied were pests’ and their numbers, plant height, number of leaves per plant, leaf area, stem girth and yield. The major insect pests identified on the plant were Bemisia tabaci, Aphis gossypii, Leucinodes orbonalis and Eublemma olivacea. Bemisia tabaci and Aphis gossypii scores were significantly larger on cow dung and poultry manure plots. Leucinodes orbonalis and Eublemma olivacea numbers were not significantly different on the treated and control plots. Mean plant height, number of leaves and yield differed significantly among the soil amended plots. Even though soil amendments improve the nutrient content of the soil and the yield of crops it could lead to increase in pests numbers and damage caused to plants.

Conservation of Predatory Arthropods in Cotton: Role of Action Thresholds for Bemisia tabaci (Homoptera: Aleyrodidae)

2002 ◽  
Vol 95 (4) ◽  
pp. 682-691 ◽  
Author(s):  
S. E. Naranjo ◽  
P. C. Ellsworth ◽  
C. C. Chu ◽  
T. J. Henneberry
Keyword(s):  
Bemisia Tabaci ◽  
Action Thresholds ◽  
Predatory Arthropods

scholarly journals Análise Faunística de Insetos Associados à Cultura do Quiabeiro [Abelmoschus esculentus (L.) Moench] em Plantio Comercial, no Município de Canindé de São Francisco, SE, Brasil

2016 ◽  
Vol 9 (2) ◽  
pp. 146-149
Author(s):  
Daniele Cristina de Oliveira Lima da Silva ◽  
Marcelo Alves Ramos ◽  
Henrique Costa Hermenegildo da Silva ◽  
Ângelo Giuseppe Chaves Alves
Keyword(s):  
Bemisia Tabaci ◽  
Aphis Gossypii ◽  
Faunal Analysis ◽  
Hippodamia Convergens ◽  
Commercial Cultivation ◽  
Aphis Gossypii Glover ◽  
Icerya Purchasi ◽  
Eriopis Connexa ◽  
Diabrotica Speciosa ◽  
Oxycarenus Hyalinipennis

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.).

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

1991 ◽  
Vol 26 (1) ◽  
pp. 169-177 ◽  
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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