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Titolo:
The epidemiology of powdery mildew on concord grapes
Autore:
Gadoury, DM; Seem, RC; Ficke, A; Wilcox, WF;
Indirizzi:
Cornell Univ, New York State Agr Expt Stn, Dept Plant Pathol, Geneva, NY 14456 USA Cornell Univ Geneva NY USA 14456 Dept Plant Pathol, Geneva, NY 14456 USA
Titolo Testata:
PHYTOPATHOLOGY
fascicolo: 10, volume: 91, anno: 2001,
pagine: 948 - 955
SICI:
0031-949X(200110)91:10<948:TEOPMO>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
UNCINULA-NECATOR; NEW-YORK; CLEISTOTHECIA; GRAPEVINES; VINEYARDS; MATURITY; CULTIVAR; INOCULUM;
Keywords:
disease management; Oidium; ontogenic resistance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Gadoury, DM Cornell Univ, New York State Agr Expt Stn, Dept Plant Pathol, Geneva, NY 14456 USA Cornell Univ Geneva NY USA 14456 Pathol, Geneva, NY 14456 USA
Citazione:
D.M. Gadoury et al., "The epidemiology of powdery mildew on concord grapes", PHYTOPATHOL, 91(10), 2001, pp. 948-955

Abstract

Vitis labruscana 'Concord' is a grape cultivar widely grown in the United States for processing into juice and other grape products. Concord grapes are sporadically but sometimes severely damaged by the grape powdery mildew pathogen, Uncinula necator. Although the foliage is often reported to be moderately resistant to powdery mildew, severe fruit infection occurs in someyears. We observed the seasonal development of powdery mildew on leaves, rachises, and berries of unsprayed Concord grapevines. Inoculations of flower and fruit clusters revealed a brief period of berry susceptibility and a protracted period of rachis susceptibility. The rachis remained highly susceptible to infection, and the severity of rachis infection increased throughout the growing season until the rachis formed a periderm shortly before harvest. In contrast, berries were nearly immune to infection within 2 weeksafter fruit set. Rachis and berry infections were detected before the disease was observed on foliage, and the incidence of rachis and berry infection often exceeded disease incidence observed on foliage until after fruit acquired substantial ontogenic resistance. Excellent control of fruit infection, and adequate control of leaf infection, was achieved by two fungicide applications targeted at the peak period of fruit susceptibility. Although Concord is thought to be moderately resistant to powdery mildew, the rachis is highly susceptible, and may be the avenue by which prebloom infections make their way onto the developing fruit. Late-season infection of the rachis neither spread to the fruit, nor did it cause fruit to drop prematurely, and may be of little economic consequence on fruit destined for processing. Although fruit of V. vinifera cultivars have been reported to remain susceptible to infection until berry sugar levels reach 8 to 15%, Concord fruit become nearly immune to infection nearly 6 weeks before this stage of development. Because powdery mildew does not become conspicuous on foliage untillate summer, it is generally regarded as a late-season problem on Concord grapes, and previous management programs have reflected this belief. However, the greatest contribution to control of fruit infection is due to fungicides applied during the peak period of fruit susceptibility, from bloom until shortly after fruit set, long before the disease is observed on foliage.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 16:39:11