Table 2. Correlation analysis between the infestation of bee colonies and biological traits of colonies from 2010 to 2015.

Coefficient of determination, R2
Infection of bee colonies–Colony strength in autumn				Infection of bee colonies–Colony strength in spring				Infection of bee colonies–Death of bees
Total	Varroa	A.apis	Nosema	Total	Varroa	A.apis	Nosema	Total	Varroa	A.apis	Nosema
0.66*	0.54	0.39	0.63	0.82*	0.42	0.19	0.89**	0.72*	0.14	0.35	0.87**

Notes:

The following designations were used: Total – infection of bee colonies with all diseases (varroosis, nosemosis, Chalkbrood disease); Varroa – Varroa destructor (varroosis); A. apis – Ascosphaera apis (Chalkbrood disease); Nosema – Nosema apis (type A nosemosis). A significant correlation is marked with star, and *, ** correspond to p < 0.05 and p < 0.01, respectively.