Abstract:No presente trabalho foi estudada a possibilidade de controle da produção de aflatoxina pelo Aspergillus flavus em amendoim, pela aplicação de fungicidas sobre as vagens logo após seu arran¬ camento. Quatro fungicidas eficientes selecionados previamente em testes "in vitro" (Ferbam, Thiram, Ortofenilfenato de sódio e Captaiol) foram utilizados em experimentos levados a efeito durante quatro anos nas regiões de Caiabu, Campinas, Marília, Pirapozinho e Ribeirão Preto.Os resultados levaram à conclusão, dentro do … Show more
“…They concluded that A. flavus growth and aflatoxin production could be eliminated by post-harvest treatment of the peanuts with some chemicals sprayed on to peanut pods under field conditions. Field studies, spraying peanuts with some fungicides, were conducted in Brazil, by Fonseca et al (1976Fonseca et al ( ,1992. The results showed the impossibility of reaching a sound conclusion about the substances' efficiency because of difficulties found in field applications.…”
Propionic acid (ammonium salt) at 3000 mg/kg (PA1) and 5000 mg/kg (PA2) of unshelled peanuts (UP); grapefruit seed extract at 5000 mg/kg (GF1) and 10,000 mg/kg (GF2); sodium orthophenylphenate at 2500 mg/kg (SOP1) and 5000 mg/kg (SOP2); thiabendazole 1000 mg/kg (TBZ1) and 5000 mg/kg (TBZ2) were studied in the laboratory, to verify their efficiency in controlling fungal growth and aflatoxin (AF) production on moist UP (16-18% moisture content). Moist UP were put into polyethylene bags with cotton plugs and incubated at 30 +/- 2 degrees C for 28 days. Treatments were considered efficient when the AF content (B1 + G1) remained under 30 micrograms/kg. PA1 treatment was efficient till 14 days of incubation and PA2 during the whole incubation period (28 days). All other treatments were not efficient, showing AF contents from 150 to 108,333 micrograms/kg during the incubation periods. Propionic acid, used as ammonium propionate, at 5000 mg/kg shows promise in controlling aflatoxin production when applied to moist unshelled peanuts.
“…They concluded that A. flavus growth and aflatoxin production could be eliminated by post-harvest treatment of the peanuts with some chemicals sprayed on to peanut pods under field conditions. Field studies, spraying peanuts with some fungicides, were conducted in Brazil, by Fonseca et al (1976Fonseca et al ( ,1992. The results showed the impossibility of reaching a sound conclusion about the substances' efficiency because of difficulties found in field applications.…”
Propionic acid (ammonium salt) at 3000 mg/kg (PA1) and 5000 mg/kg (PA2) of unshelled peanuts (UP); grapefruit seed extract at 5000 mg/kg (GF1) and 10,000 mg/kg (GF2); sodium orthophenylphenate at 2500 mg/kg (SOP1) and 5000 mg/kg (SOP2); thiabendazole 1000 mg/kg (TBZ1) and 5000 mg/kg (TBZ2) were studied in the laboratory, to verify their efficiency in controlling fungal growth and aflatoxin (AF) production on moist UP (16-18% moisture content). Moist UP were put into polyethylene bags with cotton plugs and incubated at 30 +/- 2 degrees C for 28 days. Treatments were considered efficient when the AF content (B1 + G1) remained under 30 micrograms/kg. PA1 treatment was efficient till 14 days of incubation and PA2 during the whole incubation period (28 days). All other treatments were not efficient, showing AF contents from 150 to 108,333 micrograms/kg during the incubation periods. Propionic acid, used as ammonium propionate, at 5000 mg/kg shows promise in controlling aflatoxin production when applied to moist unshelled peanuts.
“…(KIMATI, 1978;SMITH & MOSS, 1985;SALUNKE & DESAI, 1986). Sua eficiência também foi comprovada in vitro contra Aspegi77us f7avus na dose de 20 g/litro (FONSECA et al, 1976 (MILWARD, 1976;AZZOUZ & BULLERMAN, 1982;LENNOX & McELROY, 1984;MAGAN & LACEY, 1986;FIORENTIN & BARIONI, 1991). Os estudos in vitro têm demonstrado ainda, que as doses são dependentes do pH, ou seja, o efeito inibidor do ácido é maior à medida que o pH decresce (TSAI et al, 1984;MAGAN & LACEY, 1986;MARSHALL & BULLERMAN, 1986;RUSUL et al, 1987).…”
Análise estatística para a variável contagem total de fungos nos grãos.. 73 5.3.3. Análise estatística da variável contagem de fungos potencialmente aflatoxigênicos nas vagens e grãos...... 93 5.3.4. Avaliação qualitativa dos fungos pr~ sentes nas vagens e grãos isolados do me i o DRBC.
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