Data/hora: 16/06/2024 23:53:15

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 13/03/2015
Data da última atualização: | 13/03/2015
Autoria: | MARQUES, M. de A.; QUINTELA, E. D.; MASCARIN, G. M.; FERNANDES, P. M.; ARTHURS, S. P.
Afiliação: | MIRIAM DE ALMEIDA MARQUES, UFG; ELIANE DIAS QUINTELA, CNPAF; GABRIEL MOURA MASCARIN, CNPAF; PAULO MARÇAL FERNANDES, UFG; STEVEN PAUL ARTHURS, UNIVERSITY OF FLORIDA, Apopka.
Título: | Management of Bemisia tabaci biotype B with botanical and mineral oils.
Ano de publicação: | 2014
Fonte/Imprenta: | Crop Protection, v. 66, p. 127-132, Dec. 2014.
ISSN: | 0261-2194
DOI: | 10.1016/j.cropro.2014.09.006
Idioma: | Inglês
Conteúdo: | While the toxic effects of neem, Azadirachta indica A. Juss, on Bemisia tabaci Genn. are well documented, few studies have evaluated other oils. We compared neem, sesame, citrus, castor, vegetable and mineral oils (1% v/v) to a chemical standard thiamethoxam (0.17 g A.I./L) against B. tabaci biotype B life stages on dry bean plants Phaseolus vulgaris L. under screenhouse conditions. Oils and thiamethoxam exhibited low ovicidal activity (<10% egg mortality). However, significant mortality occurred due to the residual activity to 1st instars that emerged from treated eggs. Overall, impacts of egg treatments were greatest for thiamethoxam (77% total mortality for eggs and 1st instars) compared with oils which were statistically similar (22e29% mortality). Larvicidal effect of oils (against 2nd instars) was greater than ovicidal effects. Highest nymphal mortality (>81%) was achieved with castor, sesame, citrus and neem oils, which was significantly greater than for thiamethoxam (65% mortality). Adult whiteflies were exposed to fresh and aged spray residues, rather than being sprayed directly. In this case, comparatively lower efficacy was achieved from oil treatments compared with thiamethoxam. While some mortality was observed from fresh residues of slow drying oils (up to 41% for castor oil), no significant control from any oil residues >3 days old was observed in our tests. The different route of exposure against adults likely reduced the effectiveness of oil treatments which act directly on the cuticle. In trials with viruliferous adult whiteflies exposed to fresh residues, none of the tested products completely prevented transmission of bean golden mosaic virus (BGMV). However, we noted reduced virus severity ratings from plants pre-treated with castor and citrus oil. We conclude that castor, sesame, citrus and neem oils have the potential to be used in whitefly management programs.
Palavras-Chave: | Bemisa tabaci.
Thesagro: | Controle biológico; Feijão; Mosca branca; Phaseolus vulgaris.
Thesaurus Nal: | Bean golden mosaic virus; Biopesticides; Horticultural oils; Insect control; Thiamethoxam.
Categoria do assunto: | O Insetos e Entomologia
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (33204-1) - UPC - AP - DD - 2014.088 -  - 2014.088 - DIS