Data/hora: 09/06/2024 16:47:53

Biblioteca(s): | Embrapa Meio Ambiente.
Data corrente: | 22/10/2018
Data da última atualização: | 30/10/2018
Autoria: | SANTOS, T. T. M. dos; QUINTELA, E. D.; MASCARIN, G. M.; SANTANA, M. V.
Afiliação: | TASSIA TUANE MOREIRA DOS SANTOS, UFO; ELIANE DIAS QUINTELA, CNPAF; GABRIEL MOURA MASCARIN, CNPMA; MARCUS VINICIUS SANTANA, UFG.
Título: | Enhanced mortality of Bemisia tabaci nymphs by Isaria javanica combined with sublethal doses of chemical insecticides.
Ano de publicação: | 2018
Fonte/Imprenta: | Journal of Applied Entomology, v. 142, n. 6, p. 598-609, 2018.
ISBN: | 1439-0418
DOI: | https://doi.org/10.1111/jen.12504
Idioma: | Inglês
Conteúdo: | The aim of this current study was to evaluate the mortality of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) nymphs by the combination between the entomopathogenic fungus Isaria javanica (Friedrichs & Bally) Samson & Hywel-Jones and synthetic chemical insecticides. The bioefficacy of I. javanica and the insect growth regulators named spiromesifen and buprofezin was tested alone and in combination against B. tabaci nymphs under screenhouse conditions. The in vitro compatibility between these two control agents was previously assessed under laboratory conditions. The sublethal concentration (LC25) of these insecticides towards second-instar nymphs was determined and then mixed with the fungal treatments to investigate the type of interaction. All I. javanica isolates at 5 × 107 conidia/ml inflicted nymphal mortality by up to 62.4%. The insecticides did not influence the germination and mycelial growth of the selected I. javanica isolate CG1282. In general, the insecticide-fungus combinations increased nymphal mortalities in comparison with their single counterparts. Combinations with the fungus and buprofezin or spiromesifen augmented nymphal mortality by 10% and 24%, respectively, in comparison with the fungus alone. Additive interaction was found with the combination of the I. javanica CG1282 at 1 × 106 conidia/ml and spiromesifen at 1.56 ppm, and additive and synergistic interactions were achieved with the fungus at 5 × 106 conidia/ml and spiromesifen at 3.12, 6.25 and 12.5 ppm. Additive interactions were also observed from mixtures of fungus at 5 × 106 and buprofezin at 3.12 and 6.25 ppm. Only combinations of I. javanica with spiromesifen reduced to some extent the mycosis on dead nymphs. The joint action of I. javanica with sublethal doses of these insecticides may be a promising tool to assist in the integrated management system for B. tabaci.
Thesagro: | Bemisia Tabaci; Controle Biológico; Fungo Para Controle Biológico; Inseticida.
Thesaurus Nal: | Biological control; Buprofezin; Cordycipitaceae; Entomopathogenic fungi; Integrated pest management; Plant pests; Spiromesifen; Synergism.
Categoria do assunto: | H Saúde e Patologia
Registro original: | Embrapa Meio Ambiente (CNPMA)
Exemplares: | CNPMA - (16179-1) - UPC - SP - DD -  -  -  - DIS