Nosema ceranae development in Apis mellifera: Influence of diet and infective inoculum

PORRINI MARTÍN P; SARLO EDGARDO G; MEDICI SANDRA K; GARRIDO PAULA M; PORRINI DARÍO P; DAMIANI NATALIA; EGUARAS MARTÍN J

JOURNAL OF APICULTURAL RESEARCH

INT BEE RESEARCH ASSOC

Año: 2011 vol. 50 p. 35 - 41

0021-8839

To investigate the effect of the microsporidian parasite Nosema ceranae on the nutritionalcondition of the honey bee Apis mellifera and disease development under laboratoryconditions, newly emerged bees were confined and fed on three ad libitum diets: highfructose corn syrup (HFCS) + fresh bee bread; HFCS + a commercial mixture of amino acidand vitamin, and HFCS. On day 7 post-emergence, bees from each diet treatment wereindividually infected with 4.60 x 104, 2.30 x 105 or 1.15 x 106 spores of N. ceranae, keeping later on the same diet. On days 3, 6, 9, and 12, post-infection bee midguts were removed to individually quantify the spores developed. The results indicate that this parasite multiplies successfully regardless of the inoculum given or the nutritional status of its host. When bees are fed on pollen, however, the parasite develops quickly, exhibiting significantly higher intensities than under other treatments. The longevity of infected bees fed on the same diet was not affected by the degree of parasitism, but by the quality of the ad libitum diet administered. The data demonstrate a parasite development that depends on host-condition. This should be considered when designing experiments to evaluate the development and virulence of this pathogen.