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Carneiro E.,Institucional de Bolsas de Iniciacao Cientifica PIBIC | Carneiro E.,Paranaense University | Cuzzi C.,Programa de Iniciacao Cientifica PIC | Cuzzi C.,Paranaense University | And 7 more authors.
Revista em Agronegocio e Meio Ambiente | Year: 2010

Natural enemies are of great importance for sustainable agriculture and may often replace or reduce the use of agrotoxic substances which are an important component of the ecologic management of plant diseases. The biological control of diseases is on the increase throughout the world and meets with international demands for less environmentally aggressive agricultural practices. Current research consists of a monitored organic soya bean culture which characterizes plagues, predator and parasitoid insects, as well as isolating, purifying and identifying entomopathogenic fungi which may be of use within a biological control program. Major plague insects were Anticarsia gemmatalis, Chrysodeixis includens, Agrotis ipsilon, Epinotia aporema, Lagria villosa, Diabrotica speciosa, Nezara veridula, Piezodorus guildini, Euchistus heros and Dysdercus sp. Reported predators were Cycloneda sanguinea, Podisus nigrispinus, Podisus connexivus, Callida sp., Geocoris sp., Nabis sp., Chrysoperla externa and Lebia concina. The parasitoids identified were Trissolcus basalis, Trichogramma pretiosum, Eutrichopodopsis nitens, Hexacladia smithii, Ophion fl avidus, and Trichogramma atopovirilia. The fungi Nomureae rileyi and Beauveria bassiana were isolated and identifi ed. Results show that soya bean crops grown in an organic system maintain an environment capable of supporting populations of insect pests, predators and parasitoids.

Kagimura F.Y.,Programa de Iniciacao Cientifica PIC | Kagimura F.Y.,Paranaense University | Kasburg C.R.,Programa de Iniciacao Cientifica PIC | Kasburg C.R.,Paranaense University | And 9 more authors.
Revista em Agronegocio e Meio Ambiente | Year: 2011

Two commercial products, Nativo® and Sphere®, recommended in Brazil for the control of fungus diseases in soybean culture, have been evaluated with regard to their toxicity on Beauveria bassiana. Parameter comprised the vegetative growth of the entomopathogenic fungus in BDA culture medium coupled to the addition of predetermined concentrations of the two fungicides. Initial concentration was that indicated to the culture field and followed by successive dilutions. Although both products were toxic to the fungus, variations in Minimum Inhibitory Concentrations (MIC) among the fungicides demonstrated that the degree of toxicity varied according to the dilutions. In the case of Nativo®, MIC reached 350 μ / L, whereas in the case of Sphere®, MIC was 2.0 mL / L. The former had a greater inhibitory power on the fungus than the fungicide Sphere®. Toxicity studies of pesticides to natural enemies have become important since new control strategies may be used in an Integrated Pest Management program.

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