Istituto di biometeorologia     
Marchi G., Peduto F., Magnai L., Di Marco S., Calzarano F., Surico G. Some observations on the relationship of manifest and hidden esca to rainfall. In: Phytopathologia Mediterranea, vol. 45 (Supplement) pp. S117 - S126. Mediterranean Phytopathological Union, 2006.
This paper reports observations on the relationship between the yearly incidence of manifest esca (i.e. diseased plants which show foliar symptoms), hidden esca (that which remains asymptomatic throughout a growing season) and rainfall. Data from three vineyards (two in Tuscany and one in Emilia-Romagna, Italy) showed that rainfall in May-July or only in July was inversely related with hidden esca. For two vineyards, TB in Emilia-Romagna and CAR-3 in Tuscany, the spatial pattern of diseased vines in the first year of appearance of the foliar esca symp-toms was also determined. The maps of the vines in these vineyards indicated that diseased plants mostly occurred alone. This suggests that the disease had its origin in infected rooted cuttings or was triggered by inoculum aerially dispersed from distant sources and/or occurring, at least in hypothesis, in the soil.
URL: http://ejour-fup.unifi.it/index.php/pm/issue/view/191
Subject Grapevine
Symptom expression
Disease progress
Spatial distribution

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