Table 2.

The efficacy of Pi alone or in combination with reduced dose of myclobutanil in reducing the disease incidence and severity on leaves and fruit caused by Venturia pirina in 2007.

Treatments	July 9		August 1		September 9		September 9
	Leaves						Fruit
	Scab Incidence	Scab Severity	Scab Incidence	Scab Severity	Scab Incidence	Scab Severity	Scab Incidence	Scab Severity
Control	33.0a	1.7a	54.6a	3.0a	63.8a	3.2a	43.8a	2.3a
Myclobutanil 0.3 ml	9.0e	0.6d	18.0c	0.9d	28.1c	1.0e	20.7d	0.7d
Pi 10 ml	23.7b	1.3ab	35.9b	2.1b	44.7b	2.7ab	31.7b	1.9ab
Pi 20 ml	18.5bcd	0.9bcd	27.0bc	1.6bc	37.9bc	1.9cd	28.4bc	1.4bc
Myclobutanil 0.075 ml	20.4bc	1.3ab	28.3bc	1.7bc	39.0bc	2.4bc	27.3bcd	1.7b
Pi 10 ml + Myclobutanil 0.075ml	12.4de^{^z}	1.1bc	24.5bc	1.8bc	33.6bc	2.0c^{^z}	23.8bcd	1.4bc^{^z}
Pi 20 ml + Myclobutanil 0.075 ml	13.8cde	0.8cd	22.0c	1.3cd	31.4bc	1.4de^{^z}	21.4cd	1.1cd
LSD	6.9	0.4	12.5	0.6	15.1	0.5	8.2	0.5

↵^zSynergistic effect according to Limpel’s formula.
Scab incidence = total number of fruit and leaves with scab symptoms/number of leaves (100) and fruit (30) examined. Lower case letters indicate significant differences between means for each evaluation date by LSD (P = 0.05). All treatments applied per liter of water. All values mean of ten trees, 100 leaves and 30 fruits per tree.
Leaf scab severity scale: 0 = No scab observed; 1 = less than 5% of leaves affected and no aesthetic impact; 2 = 5%–20% of leaves affected with some yellowing but little or no defoliation; 3 = 21%–50% of leaves affected, significant defoliation and/or leaf yellowing; 4 = 51%–80% of leaves affected, severe foliar discoloration; 5 = 81%–100% of leaves affected with 90%–100% defoliation.
Fruit scab severity scale: 0 = no visible lesions; 1 = <10% fruit surface infected; 2 = 10%–25% fruit surface infected; 3 = 25%–50% fruit surface infected; 4 = >50% fruit surface infected.