Table 1.

Selected calcium foliar sprays compared for the control of apple scab (Venturia inaequalis) on apple cv. Crown Gold as measured by leaf and fruit scab severity, chlorophyll fluorescence (Fv/Fm values), leaf chlorophyll content (SPAD values), and leaf Ca content. Data from 2006.

Treatment	Leaf scab severity^{^z}	Fruit scab severity^{^z}	Fv/Fm^{^y}	SPADy	Leaf Ca content^{^z}
Control	3.50	2.85	0.723	12.26	1.22
Silwett	3.62ns	2.50ns	0.713ns	15.69ns	1.24ns
Calcium chloride	2.13*	1.38*	0.813*	19.12*	1.47*
Calcium sulfate	2.50*	2.75ns	0.803*	18.34*	1.39*
Calcium nitrate	3.00ns	1.75*	0.797ns	14.3 ns	1.51*
Calcium nitrate borate	2.50*	2.13*	0.800ns	13.05ns	1.46*
Calcium hydroxide	2.13*	1.50*	0.799ns	18.70*	1.58*
Calcium metalosate	2.75ns	2.13*	0.723ns	12.80ns	1.37*
Calcium amino acid complex	2.38*	2.25ns	0.793ns	18.75*	1.59*
Penconazole	1.70*	1.00*	0.811*	20.51*	1.24ns
DF	79	79	79	79	79
LSD	0.826	0.678	0.082	3.86	0.134
Significance of Ca (P value)	0.002	<0.001	0.059	<0.001	<0.001

↵^zValues mean of 8 trees.
↵^yValues mean of 8 trees, 10 leaves per tree.
Asterisk (*) indicates value significantly different from controls according to Least Significant Difference (LSD) at P < 0.05. ns = not significant different from control value.