Glasshouse evaluation of fungicides for the control of sunflower downy mildew (Plasmopara halstedii)

G. Oros, F. VIRÁNYI

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A precise, reproducible and easy‐to‐handle glasshouse test is described for the evaluation of the systemic activity of chemicals for the control of Plasmopara halstedii, the downy mildew pathogen of sunflower. Four‐day‐old sunflower germlings were inoculated by immersing them in a zoosporangium suspension. Seedlings were then immersed in appropriate concentrations of the chemicals to be tested. Plants were grown in a glasshouse and assessed on three occasions to determine successively antisporulant, curative (systemic fungistatic), and eradicant effects. Sporulation in general was inhibited by lower concentrations than those required to exert an eradicant effect. There was a highly significant correlation between the ED50 values for visually recognised disease symptoms (stunting, dampingsff and leaf chlorosis) and for both curative and eradicant effects. Among 13 compounds tested, metalaxyl, RE 26745, furalaxyl, LAB 149202F and cymoxanil showed sufficient eradicant activity, to justify field evaluation for eradication of seed infections.

Original languageEnglish
Pages (from-to)53-63
Number of pages11
JournalAnnals of Applied Biology
Volume110
Issue number1
DOIs
Publication statusPublished - 1987

Fingerprint

Plasmopara halstedii
downy mildew
Helianthus annuus
fungicides
cymoxanil
greenhouses
metalaxyl
chemical concentration
chemical control
chlorosis
sporulation
growth retardation
signs and symptoms (plants)
seedlings
pathogens
seeds
infection
leaves
testing

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

Glasshouse evaluation of fungicides for the control of sunflower downy mildew (Plasmopara halstedii). / Oros, G.; VIRÁNYI, F.

In: Annals of Applied Biology, Vol. 110, No. 1, 1987, p. 53-63.

Research output: Contribution to journalArticle

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