Table 1.

Area under the disease progress curve (AUDPC) of grapevine powdery mildew under field conditions.

Year	Treatment	AUDPC on severity	AUDPC on incidence
2010	Control	1667.6±312.6b	5544.2±233.6b
	NB	16.2±0.9a	398.3±58.1a
	Sulfur	54.9±15.7a	726.6±235.3a
2011	Control	1506.9±101.5b	4842.5±98.8b
	NB	11.5±6.3a	266.5±136.1a
	Sulfur	46.0±13.0a	926.5±301.3a
2013	Control	101.1±40.1b	756.8±23.3b
	NB	7.3±2.5a	120.0±13.8a
	Sulfur	3.5±3.5a	29.9±7.7a

Area under the disease progress curve (AUDPC) was calculated for powdery mildew severity and incidence on leaves of grapevines treated with water (Control), nutrient broth (NB) or sulfur (Sulfur), as standard fungicide, under field conditions in three different seasons (2010, 2011, and 2013). Treatments were applied weekly from the beginning of May to the middle of August. Disease severity and incidence were assessed weekly as percentage of adaxial leaf area covered by white sporulation and percentage of leaves showing symptoms by scoring 40 leaves per replicate, respectively. The mean AUDPC and standard error values of three replicates (eight plants each) are presented for each treatment. For each year, different letters indicate significant differences of disease incidence and severity among treatments according to Tukey's HSD test (α = 0.05).