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576. [ . ()]. Tsvetanov T., Hristov P., Grigorova T., Ivanov H. Influence of the Type of Feeding on the Egg Laying of Queen Bees // . .-2019.-Vol.56,N 6.-P. 53-60.-.-. .-Bibliogr.: p.59-60. 25717.
; APIS MELLIFERA; ; ; ; ;

577. [ Varroa destructor (Apis mellifera). ]. Lazarov S., Zhelyazkova I. Content of Crude Protein in the Body and Total Protein and Lysozyme in the Haemolymph of Worker Bees (Apis mellifera L.) according to their infestation with Varroa destructor // . .-2019.-Vol.56,N 2.-P. 9-15.-.-. .-Bibliogr.: p.14-15. 25717.
; APIS MELLIFERA; ; ; VARROA DESTRUCTOR; ; ; ; ;

578. [ ]. .., .., .. // . . . . -. .-2020.-N 4(63).-. 127-134.-. .-.: .132-134. 05-13723.
; APIS MELLIFERA; ; ; ; ; ; -; ;

579. Apis mellifera mellifera L. .., .. // .-2021.-N 1.-. 84-91.-. .-.: .88-90. 3687.
; APIS MELLIFERA; ; ; ;

580. [ ., , 2003-2016 .]. Shumkova R., Balkanska R. Development of Beekeeping in Smolyan Region in the Period 2003-2016 // . .-2019.-Vol.56,N 1.-P. 9-16.-.-. .-Bibliogr.: p.16. 25717.
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581. [ - Varroa destructor. ()]. Tsvetanov T. Influence of Bipin-T and Bisanar drugs on the infestation of bee families with Varroa Destructor // . .-2019.-Vol.56,N 6.-P. 36-43.-.-. .-Bibliogr.: p.42-43. 25717.
; APIS MELLIFERA; ; ; ; VARROA DESTRUCTOR; ; ; ; ; ;

582. - [ ]. .., .., .., .. // i ii i. .-2021.-.59,N 1.-. 102-110.-. .-.: .108-109. 80005.
; APIS MELLIFERA; ; ; ; ; - ; ; ; - ;

583. [ Argus Ras, Thymo Varo San Eco Varo San , Varroa destructor. ()]. Tsvetanov T. Study of the effects of Argus Ras, Thymo Varo San and Eco Varo San on bee families with Varroa Destructor // . .-2019.-Vol.56,N 6.-P. 44-52.-.-. .-Bibliogr.: p.51-52. 25717.
; APIS MELLIFERA; ; VARROA DESTRUCTOR; ; ; ;

584. Physical and Chemical Indicators, Content of Micro and Macroelements and Heavy Metals in Acacia Honey [ - , - . ()]. Eremia N., Nejkovchena J., Kirijak A., Sari N., Kosheleva O. // . .-2019.-Vol.56,N 6.-P. 61-68.-. .-Bibliogr.: p.68. 25717.
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