Free Access Genetic differentiation estimated by isozymic analysis of Africanized honeybee populations from Brazil and from Central America p. 271 M.A. Del Lama, J.A. Lobo, A.E.E. Soares and S.N. Del Lama DOI: https://doi.org/10.1051/apido:19900401 PDF (579.5 KB)
Free Access Numbers of spermatozoa in queens and drones indicate multiple mating of queens in Apis andreniformis and Apis dorsata p. 281 G. Koeniger, N. Koeniger, M. Mardan, R.W.K. Punchihewa and G.W. Otis DOI: https://doi.org/10.1051/apido:19900402 PDF (313.0 KB)
Free Access A bait station for survey and detection of honey bees* p. 287 R.G. Danka, J.L. Williams and T.E. Rinderer DOI: https://doi.org/10.1051/apido:19900403 PDF (421.5 KB)
Free Access Raster-elektronenmikroskopische Studien an Pollen aus Bienenhonig. III. Der Harmomegathie-Mechanismus und seine Auswirkungen auf die Exine-Strukturen am Beispiel unterschiedlicher PollentypenScanning electron microscopic studies of pollen from honey. III. The harmomegathy-mechanism and its effect on the exine-structure using different pollen types p. 293 K. von der Ohe and J.H. Dustmann DOI: https://doi.org/10.1051/apido:19900404 PDF (1.605 MB)
Free Access Étude biométrique de populations d'abeilles tunisiennesBiometrical study of honey bee populations from Tunisia p. 303 K. Grissa, J.M. Cornuet, K. Msadda and J. Fresnaye DOI: https://doi.org/10.1051/apido:19900405 PDF (424.3 KB)
Free Access Response of Apis cerana Fabr towards brood infested with Varroa jacobsoni Oud and infestation rate of colonies in Thailand p. 311 W. Rath and W. Drescher DOI: https://doi.org/10.1051/apido:19900406 PDF (656.5 KB)
Free Access Western Germany Bee Research Institutes Seminar. Report on the Meeting at Adelsdorf, 28-30 March 1990 p. 323 DOI: https://doi.org/10.1051/apido:19900407 PDF (3.965 MB)
