Developmental stage response to fungicides of Plasmopara halstedii (sunflower downy mildew)

F. Virányi, G. Oros

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The response of Plasmopara halstedii to anti-oomycete fungicides varied during fungal ontogeny, particularly between host-dependent (HD) and host-independent (HI) stages in the life-cycle. Mycelial growth was found to be the most sensitive to phenylamides. Among HI stages of development, sporangia were the least sensitive to fungicides, the ED50 values being two-fold higher than those for cystospore germination. Zoospores were very sensitive to fosetyl-Al but relatively insensitive to all other fungicides even after prolonged exposure. The initiation of the germ-tube of cystospores was less sensitive than germ-tube elongation. When comparing developmmental stage responses with fungicides by means of principal component analysis, the presence of five independent components has been demonstrated. Of these, the first and second components accounted for 72% of the total variation to which HD and HI stages contributed differently.

Original languageEnglish
Pages (from-to)199-205
Number of pages7
JournalMycological Research
Volume95
Issue number2
DOIs
Publication statusPublished - 1991

Fingerprint

Sporangia
Plasmopara halstedii
Oomycetes
Helianthus
downy mildew
fungicide
Germination
Principal Component Analysis
Life Cycle Stages
developmental stage
Helianthus annuus
fungicides
developmental stages
Growth
germ tube
fosetyl
sporangia
zoospores
ontogeny
germination

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science
  • Biotechnology
  • Genetics

Cite this

Developmental stage response to fungicides of Plasmopara halstedii (sunflower downy mildew). / Virányi, F.; Oros, G.

In: Mycological Research, Vol. 95, No. 2, 1991, p. 199-205.

Research output: Contribution to journalArticle

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