KETAHANAN Peronosclerospora maydis TERHADAP FUNGISIDA
Intensive using of metalaxyl to control corn downy mildew caused emergence of resistant strains of P. maydis to metalaxyl. These resistant strains have caused major damage due to downy mildew. Therefore, it is necessary to manage P. maydis resistance againts fungicide. One of the strategies resistan...
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| Main Authors: | , |
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2014
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| Online Access: | https://repository.ugm.ac.id/130710/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=71137 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | Intensive using of metalaxyl to control corn downy mildew caused
emergence of resistant strains of P. maydis to metalaxyl. These resistant strains
have caused major damage due to downy mildew. Therefore, it is necessary to
manage P. maydis resistance againts fungicide. One of the strategies resistance
management is using different active ingredients fungicide, but have same ability
to control corn downy mildew.The aims of this study is to determine the
effectiveness of fenamidone fungicides and mix formulation fenamidone and
propamocarb hydrochloride as subtitute of metalaxyl to inhibit the development
of downy mildew, and to find out the possibility of the emergence of resistant
strains to the fungicides tested in this study. The experiment was conducted in
vitro to determine inhibition ability of fungicides againts conidial germination of
P. maydis, and to know the ability of fungicides in suppressing the development
of downy mildew conducted in planta and field efficacy trials in Kediri. Source of
inoculum is P. maydis Klaten isolate and Kediri isolate. The results showed that
the application fenamidone at highest dose (32 ml/kg) and the mixture of
fenamidone and propamocarb hydrochloride at highest dose (80 ml/kg) failed to
inhibit the development of downy mildew. It meaned that P. maydis Kediri
isolate as apparently resistant to both of fungicides. It is presumably because of
the similar mode of action between fenamidone and metalaxyl which is inhibiting
respiration of pathogen. Therefore the mixture of fenamidone and propamocarb
hydrochloride was unsuitable to control downy mildew. To avoid the emergence
of resistant strains, resistance management of P. maydis riquired wisely to replace
fungicide that has a different mode of action. |
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