downy mildew

Lemma

downy mildew

Etichetta di dominio

EN

Etichetta grammaticale

c. n.

Definizione

A disease of vines causes by a fungus (plasmopara) (peronospora viticola) which invades the green parts of the vine. 1

Nota

Initial leaf symptoms are light green to yellow spots, called “oil spots” because they may appear greasy. Under humid conditions, white, downy spore masses can be seen on the lower leaf surface. These spores are wind dispersed. The lesions eventually turn brown as the infected tissue dies. Severely infected leaves drop prematurely, which can reduce winter hardiness of the vine. Infected flower clusters dry up or become covered with white spores under humid conditions. Infected berries turn a mottled dull-green or reddish purple and readily fall from the cluster. Although berries become resistant to infection within three weeks after bloom, the rachis remains susceptible for several weeks longer. 2

Contesto

Downy mildew is common in cool, humid environments but seldom occurs in hot, dry areas. 3

Trascrizione fonetica

[ˈdaʊ.ni ˈmɪl.djuː] 4

Sinonimi e Antonimi
ND
Abbreviazioni
ND
Etimologia

Downy: from down "soft feathers," late 14c., from O.N. dunn, perhaps ultimately from PIE base *dheu- (1) "to fly about (like dust), to rise in a cloud."
Mildew: M.E. mildeu "honeydew, nectar," from O.E. mildeaw "honeydew" (sticky stuff exuded by aphids), from P.Gmc. compound of *melith "honey" + *dawwaz "dew" (cf. O.S. milidou, Du. meeldauw, Ger. Meltau "mildew"). 5

Etichetta di paese
ND
Ente

Università degli Studi di Genova - Facoltà di Lingue e letterature straniere - Corso di laurea Teorie e tecniche della mediazione interlinguistica

Data della scheda
Wed Feb 27 00:00:00 2008
Autore

Alice Benzi rev. Gerbaudo

Fonti

1 : «http://iate.europa.eu/iatediff/FindTermsByLilId.do?lilId=1616865&langId=en», (03/11/2011)

2 : « http://www.grapes.msu.edu/downymildew.htm», (04/11/2011)

3 : « http://winegrapes.tamu.edu/grow/downy.html», (04/11/2011)

4 : «http://dictionary.cambridge.org/», (04/11/2011)

5 : «http://www.etymonline.com/index.php», (04/11/2011)

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