Table 1.

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 2006.

Treatments	July 13		August 9		September 5		September 5
	Leaves						Fruit
	Scab Incidence	Scab Severity	Scab Incidence	Scab Severity	Scab Incidence	Scab Severity	Scab Incidence	Scab Severity
Control	26.4a	1.3a	43.8a	2.7a	51.6a	3.0a	50.5a	2.9a
Myclobutanil 0.3 ml	5.0e	0.4d	12.8c	0.5d	21.1d	0.7e	18.2c	0.4c
Pi 10 ml	18.1b	1.0ab	26.7b	1.8b	40.2b	2.3b	40.3a	2.0b
Pi 20 ml	13.0bcd	0.7bcd	20.9bc	1.1cd	32.8bc	1.6cd	33.3b	1.4b
Myclobutanil 0.075 ml	14.0bc	0.8bc	22.0bc	1.3bc	35.2b	2.0bc	32.4b	1.9b
Pi 10 ml + Myclobutanil 0.075ml	7.0de^{^z}	0.6cd^{^z}	19.5bc	1.0cd	26.7cd^{^z}	1.8bc	27.8bc	1.6b
Pi 20 ml (0.66) + Myclobutanil 0.075 ml	7.0de^{^z}	0.4d^{^z}	14.3c	0.8cd	24.1cd	1.0de^{^z}	20.3c^{^z}	0.6c^{^z}
LSD	6.4	0.30	12.3	0.62	11.3	0.62	10.8	0.6

↵^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.