Effect of Leaf Removal and FoliarApplications on Powdery Mildew and Yield/Quality of Grape in Organic Viticulture

Year 2016, Volume: 45 Issue: 2-3, 73 - 87, 30.12.2016

Nedim Çetinkaya , Fadime Ateş

Abstract

Disease control in organic agriculture is based on preferential treatment of advanced cultivation techniques
rather than to be involved directly applications to pathogens. Powdery mildew (Erysiphe necator Schwein syn
Uncinula necator (Schwein.) Burrill) is a destructive disease with its variable disease incidence and severity
depending upon years. With this study; we aimed to determine the effect of cultural practice and alternative
chemicals on E. necator and yield/quality; intended for control of powdery mildew which is an important problem
of vine cultivation in the organic agriculture conditions. The research was carried out for 3 years in “Sultana
Seedless Grape” fields in Alaşehir-Yeşilyurt foundation which is belong to Manisa Viticulture Research Station.

It was determined that there is an disease control in fields in which leaf removal are conducted when
compared with organic fields and conventional control in which leaf removal are not conducted. The repeated strong
negative relationship (r = -0.85) has been determined between leaf removal and disease severity during research.
Powdery mildew disease severity show statistically significant reduction in fields which is treated with sulfur and
sodium bicarbonate dependent on years when compared with conventional controls. Strongly negative relationship
(r=-0,82/-0,87) was determined between powdery mildew disease severity and yield values. There were no
significant adverse effects on criteria of yield quality as a consequence of leaf removal process. Strong positive
interaction (r = + 79 / + 93) was determined between leaf removal process and yield quality. 

Keywords

Grapevine, Erysiphe necator, leaf removal, sodium bicarbonate, sulphur dioxide, organic viticulture, disease control, grape yield

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