Table 4. Percentage of colony losses in apiaries non-infected (negative) and infected (positive) by different pathogens in each sampling period of 2009 and 2010.

p value in italics indicates statistically significant difference (t-Student test, p <0.05). Only pathogens found in at least 10% of the analysed samples were considered in the test.

Colony losses (%)
Pathogen / period	2009			2010
	Negative	Positive	p	Negative	Positive	p
Nosema/1	12.8±3.49	23.65±2.88	0.016	5±1.75	7.9±1.85	0.247
Nosema/2	15.38±3.25	21.23±2.84	0.170	7.73±2.03	4.85±1.58	0.351
Nosema/3	17.63±3.53	22.93±2.88	0.150	9.11±1.98	3.87±1.1	0.173
Nosema/4	28.7±4.76	25.65±3.92	0.524	7.14±2.34	6±2.54	0.976
APBV/1	Infection < 10%			7.88±1.61	3.33±1.88	0.257
APBV/2	18.8±2.29	22.22±7.78	0.803	6.78±1.61	8.33±3.05	0.670
APBV/3	18.65±2.13	28.75±11.72	0.184	8.39±1.72	6.19±2.71	0.371
APBV/4	26.75±3.27	28.75±6.93	0.725	8.67±2.66	3.16±1.54	0.154
CPBV/1	Infection < 10%			5.67±1.13	16.36±6.78	0.058
CPBV/2	19.2±2.32	18.89±7.35	0.732	6.76±1.52	10±4.08	0.310
CPBV/4	Infection < 10%			6.9±2.03	4.29±2.02	0.954
DWV/1	17.37±2.68	26.5±4.43	0.062	7.74±1.78	6.81±2.02	0.340
DWV/2	18±3.13	20.23±3.11	0.822	7.62±2.17	6.96±1.78	0.492
DWV/3	16.36±3.7	20.83±2.72	0.375	11.82±4.23	7.12±1.54	0.217
DWV/4	15±7.19	28.81±3.13	0.038	4±4	6.82±1.92	0.619
SBV/1	19.17±2.32	21.76±6.76	0.911	6.88±1.69	7.67±2.48	0.880
SBV/2	19.14±2.74	19.23±3.68	0.900	8.64±2.57	6.55±1.71	0.476
SBV/3	Infection < 10%			7.78±2.47	7.8±1.81	0.950
SBV/4	Infection < 10%			5.56±1.8	7.73±3.29	0.850
BQCV/1	14.57±2.3	27.42±4.35	0.009	4±2.45	7.4±1.49	0.736
BQCV/2	14.05±3.28	23.19±2.85	0.022	8.33±4.77	7.04±1.49	0.644
BQCV/3	19.69±3.09	19.6±3.09	0.911	2±2	8.19±1.54	0.292
BQCV/4	20±6.24	28.72±3.29	0.186	4.29±2.97	6.9±2	0.713