Comparison of Epidemiology of Gray Mold, Anthracnose Fruit Rot, and Powdery Mildew in Day-Neutral Strawberries in Field and High-Tunnel Conditions in Ontario

Figures & data

TABLE 1 Comparison of Cumulative Incidences of Botrytis Fruit Rot (BFR), Anthracnose Fruit Rot (AFR), and Powdery Mildew (PM), and Marketable Berry Yields of Unsprayed Plots in Outdoors and in High Tunnels

Parameter ^z	Year	Cultivar	Outdoor plots	Tunnel plots
IBFR	2009	Seascape	Negligible	Negligible
		Albion	Negligible	Negligible
	2010	Seascape	1.57	0.31
		Albion	1.65	0.39
IAFR	2009	Seascape	22.89	5.27
		Albion	32.93	4.53
	2010	Seascape	10.68	0.7
		Albion	20.30	0.9
IPMIF	2009	Seascape	4.89	11.52
		Albion	5.11	12.89
	2010	Seascape	3.83	13.95
		Albion	0.62	6.95
CMFN	2009	Seascape	141	185
		Albion	110	189
	2010	Seascape	105	160
		Albion	69	229
CMFW (gm)	2009	Seascape	1,170	2,417
		Albion	1,109	2,450
	2010	Seascape	835	1,466
		Albion	793	2,816
^zIBFR = incidence of Botrytis fruit rot, IAFR = incidence of Anthracnose fruit rot, IPMIF = incidence of powdery mildew infected fruits. Incidence of all three fruit diseases were calculated as percent cumulative incidence. CMFN = Cumulative marketable fruit number, CMFW = cumulative marketable fruit weight per plot (1.2 m^2). Harvesting was started on July 30th and 19th in 2009 and 2010, respectively, and ended in the last week of October in both years.

FIGURE 2 Cumulative disease incidence and marketable fruit yields of ‘Albion’ and ‘Seascape’ strawberry in Captan-sprayed plots and unsprayed plots in outdoor and high-tunnel environments. (A) Anthracnose fruit rot; (B) Powdery mildew; (C) Marketable fruit numbers; (D) Marketable fruit yields (gm).

FIGURE 1 Average weekly incidences of Anthracnose fruit rot and powdery mildew in unsprayed ‘Albion’ and ‘Seascape’ day-neutral strawberries in an outdoor field and tunnel plots in 2009 and 2010. (A) and (B) Anthracnose fruit rot; (C) and (D) Powdery mildew on fruit.

FIGURE 3 Weather variables recorded in outdoor and high-tunnel environments. (A) Daily rainfall in 2009 and 2010; (B) Daily average temperature and relative humidity (RH) in 2009; (C) Daily average temperature and RH in 2010 (color figure available online).