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Arquivos do Instituto Biológico

On-line version ISSN 1808-1657

Arq. Inst. Biol. vol.79 no.2 São Paulo Apr./June 2012

http://dx.doi.org/10.1590/S1808-16572012000200009 

ARTIGO CIENTÍFICO SCIENTIFIC ARTICLE

 

Ação protetora, residual, curativa e anti-esporulante de fungicidas no controle da requeima e da pinta preta da batata em condições controladas

 

Protective, residual, curative and antisporulating action of fungicides in the control of early and late blight of potatoes under controlled conditions

 

 

J.G. TöfoliI; P.C.T. MeloII; R.J. DominguesI

IInstituto Biológico, Centro de Pesquisa e Desenvolvimento de Sanidade Vegetal, Av. Cons. Rodrigues Alves, 1252, CEP 04014-002, São Paulo, SP. Brasil. E-mail: tofoli@biologico.sp.gov.br
IIUniversidade de São Paulo, Escola Superior de Agricultura "Luiz de Queiroz", Departamento de Produção Vegetal, Piracicaba, SP, Brasil

 

 


RESUMO

A ação de fungicidas em diferentes fases do processo infeccioso da requeima (Phytophthora infestans) e da pinta preta (Alternaria solani) da batata foi estudada em condições de casa-de-vegetação e laboratório. A ação protetora e residual foi avaliada através de inoculações realizadas com os respectivos patógenos a 1, 3, 6, 9, 12 e 15 dias após a pulverização (DAP). Para avaliar a ação curativa, os fungicidas foram aplicados 1, 12, 24 e 48 horas após a inoculação (HAI) para requeima e 1, 24, 48 e 72 HAI para a pinta preta. As ações preventiva, residual e curativa foram avaliadas com base na porcentagem de área foliar afetada e a ação anti-esporulante através da contagem de esporângios e conídios. Todos os fungicidas promoveram elevada proteção contra a requeima e a pinta preta. Os fungicidas sistêmicos apresentaram redução de controle a partir dos 12 DAP, enquanto que os fungicidas translaminares e mesostêmicos a partir dos 9 DAP. Quanto à ação curativa e anti esporulante, destacaram-se principalmente os fungicidas sistêmicos aplicados até as 24 horas após a inoculação (HAI). Fungicidas translaminares e mesostêmicos foram capazes de inibir a requeima quando aplicados até 12 HAI. Os fungicidas de contato destacaram-se apenas para ação protetora.

Palavras-chave: Solanum tuberosum, Phytophthora infestans, Alternaria solani, controle químico.


ABSTRACT

The action of fungicides at different phases of the infectious process of late blight (Phy tophthora infestans) and early blight (Alternaria solani) of potatoes was studied under greenhouse and laboratory conditions. Protective and residual action was evaluated through inoculations undertaken with the respective pathogens 1, 3, 6, 9, 12 and 15 days after application. To evaluate the curative action against late blight, fungicides were applied 1, 12, 24 and 48 hours after inoculation, and against early blight 1, 24, and 48 hours after inoculation. Protective, residual and curative actions were evaluated according to the percentage of the foliar area affected, while the antisporulating action was assessed through sporangia and conidia counting. All the fungicides, regardless of their mode of action, provided high protection against late and early blight. Systemic fungicides showed a reduction of control starting at 12 days after application, while translaminar and mesostemic fungicides showed this reduction starting at 9 days after application. In regard to curative and antisporulating actions, systemic fungicides applied until 24 hours after inoculation were especially outstanding. Translaminar and mesostemic fungicides could inhibit late blight when applied until 12 hours after inoculation. Contact fungicides stood out in preventive action only.

Key words: Solanum tuberosum, Phytophthora infestans, Alternaria solani, chemical control.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

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Recebido em 12/12/10
Aceito em 15/5/12

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