Differential susceptibility across honey bee colonies in larval chalkbrood resistance

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Chalkbrood susceptibility of in vitro reared honey bee larvae was investigated. Larvae were grafted from 3—4 colonies headed by pure mated queens of Apis mellifera carnica, A. Three day old larvae were fed with different dosages of Ascophaera apis spores and a clear dose-response relationship was shown. Over the whole experiment LD 50 estimates ranged from 55 to spores. The response differed significantly up to a factor ten between colonies of the same subspecies. The mean time to death decreased with increased dose, with more larvae dying faster after eating more fungal spores. The A. However due to the limited number of colonies included and the high variation shown we cannot predict that any A.

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Metrics details Abstract The invasion of the Western honey bee, Apis mellifera, by Varroa destructor is attributed to two mitochondrial haplotypes K and J so as to shifted last century from their basic host the Eastern honey bee, A. Here, mitochondrial DNA sequences cox1, cox3, atp6 and cytb: base pairs were obtained from mites infesting both Eastern and Western honeybees respectively 21 after that 11 colonies from Asia including regions where the shifts first occurred. A total of eighteen haplotypes were uncovered in Asia 11 on A. Two new variants of the K haplotype and two of the J haplotype were found on Western honeybees all the rage what appeared to be well-established infestations. New haplotypes may represent a ability threat to A. Zusammenfassung Die Varroamilbe, Varroa destructor, ist ein gut adaptierter Parasit der Östlichen Honigbiene Apis cerana , insbesondere in den nördlichen Regionen des asiatischen Festlands. Mit ihrem Wechsel auf die Westliche Honigbiene A. Als verantwortlich für den Parasitenübergang werden zwei mitochondriale mt Haplotypen K1 und J1 von Varroa angesehen.

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