Results 181 to 190 of about 6,489 (218)

Comparison of resistance to powdery mildew and downy mildew in Chinese wild grapes

2015
This research was performed under natural conditions in an effort to compare resistance within Chinese Vitis germplasm to powdery mildew and downy mildew. Sixty-six genotypes of 13 Chinese wild Vitis species were selected to evaluate disease resistance. Seven among these 13 species, V. amurensis, V. romanetii, V. piazezkii, V. davidii, V.
Wan, Yizhen, Schwaninger, Heidi, He, Puchao, Wang, Yuejin   +3 more
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Spatial Heterogeneity of the Incidence of Grape Downy Mildew

Phytopathology, 1995
Heterogeneity of the incidence of downy mildew of grape, caused by Plasmopara viticola, was quantified in an experimental Ohio vineyard. The proportion of diseased leaves on each of 15 shoots (sampling units) per plot was determined for 18 separate plots at two times (generally August and September) during each of 3 yr.
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Grape Downy Mildew in India:effect of Infection on Plant Plant Pigments

MADRAS AGRICULTURAL JOURNAL, 1975
In grape leaves of five different colours infected by downy mildew.the contents of total chlorophyll and anthocyanin were reduced.On the other hand.the contents of carotene and xanthophyll increased in infected leaves.An enhanced activity of chlorophyllase was noticed in infected leaves of all ages and grades of infection.
Srinivasan K, Jeyarajan R
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Control of downy mildew on grapes in organic viticulture.

Communications in agricultural and applied biological sciences, 2009
Few active substances with fungicide activity can be used in organic farming, above all copper and sulphur. The copper is the only substance that can be used against downy mildew; however, since it causes problems of environmental impact, incompatible with organic farming's objective of environmentally friendly farming, the Commission of the European ...
A, La Torre, S, Talocci, G, Spera, R, Valori   +3 more
openaire   +1 more source

SCREENING OF THE GEORGIAN GRAPE GERMPLASM TO SUSCEPTIBILITY OF DOWNY MILDEW: PRELIMINARY RESULTS

Acta Horticulturae, 2014
Downy mildew of grapevine, caused by a fungal pathogen Plasmopara viticola (B. et C.) Berl. et de T., is one of the most widespread and destructive vineyard diseases all over the world. The degree of resistance or, on the contrary, susceptibility to P. viticola is usually very low in the different cultivars of Vitis vinifera.
N. Bitsadze, R. Chipashvili, L. Tskhvedadze, M. Aznarashvili, D. Maghradze, A. Vercesi, O. Failla   +6 more
openaire   +2 more sources

Multivariate forecasting model to optimize management of grape downy mildew control

2015
Aim of this study was to develop a forecasting model for Plasmopara viticola to achieve rational disease management and to reduce the use of copper treatments in organic farming. Starting from meteo-climatic, agronomic and phytopathological data a partial least squares discriminant analysis was developed.
Menesatti, P., Antonucci, F., Costa, C., Mandalà, C., Battaglia, V., La Torre, A.   +5 more
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EVALUATION OF 17 TABLE GRAPE ACCESSIONS FOR FOLIAR RESISTANCE TO DOWNY MILDEW

Acta Horticulturae, 2015
Grapevine downy mildew (DM) could cause serious damage to vines and young clusters in a humid climate, and multiple fungicides are applied to control this disease. Since most grapes are produced for fresh fruit consumption in Japan, we evaluated foliar DM resistance of 17 table grape cultivars/selections that are important for Japanese table grape ...
A. Kono, Y. Ban, A. Sato, N. Mitani
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Management of Grape Downy Mildew under Field Conditions Using Fungitoxicants

Journal of Krishi Vigyan
AbstractDowny mildew is destructive and yield limiting disease in grapes incited by a biotrophic fungi Plasmopara viticola. Owing to aggressive virulence in pathogen the development of resistance against the fungicides is early. To cater this need, efforts were made to evaluate newer fungicides against grape downy mildew during two seasons (rabi/summer
Noorulla Haveri, M P Basavarajappa, Manjunath Hubballi, Sateesh Pattepur, V Gayathri   +4 more
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Grape downy mildew in India I. Foliar, floral and fruit infections

2016
VITIS - Journal of Grapevine Research, Vol. 15 No.
Srinivasan, N., Jeyarajan, R.
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Does leaf position influence induced resistance to grape downy mildew?

2013
We observed that protection against grape downy mildew achieved by resistance inducers was higher in the adult leaf than in the younger, not fully expanded leaf. Using sulfated laminarin as inducer, this difference of efficacy could be correlated to stronger defense reactions (i. e.
Steimetz, Emilie, Trouvelot, Sophie, Bordier, Adeline, Heloir, Marie-Claire, Poinssot, Benoît, Adrian, Marielle, Daire, Xavier   +6 more
openaire   +1 more source