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Searching for an American foulbrood early detection threshold by the determination of Paenibacillus larvae spore load in worker honey bees

Gende, Liesel Brenda and Satta, Alberto and Ligios, Virna and Ruiu, Luca and Buffa, Franco and Fernández, Natalia and Churio, María Sandra and Eguaras, Martin Javier and Fiori, Mario and Floris, Ignazio (2011) Searching for an American foulbrood early detection threshold by the determination of Paenibacillus larvae spore load in worker honey bees. Bulletin of Insectology, Vol. 64 (2), p. 229-233. ISSN 1721-8861. Article.

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Abstract

In the present study, the relationship between Paenibacillus larvae (White) spore load per adult bee and the appearance of American Foulbrood (AFB) symptoms in the colony was investigated. A total of 44 beehives from 8 apiaries located in Sardinia island (Italy) were involved in this research. Adult bee samples were collected from colonies either showing or lacking the disease symptoms, and the average number of P. larvae spores per adult bee was determined through microbiological culture, followed by bacterial identification through a combination of morphological, biochemical and genetic assays. Correspondence between the detection of disease symptoms in the hives and the number of spores per adult bee samples was obtained. In line with previous studies, the outcome of the present investigation supports the employment of adult bee spore load determination as a tool to get information on the actual health status of the colony. This allows an early detection of AFB disease, especially when clinical symptoms in colonies are still not observable. In addition, the results suggest that a level around 3,000 P. larvae spores per adult bee, obtained with our experimental conditions, might represent a threshold for the appearance of clinical symptoms in the colony.

Item Type:Article
ID Code:7407
Status:Published
Refereed:Yes
Uncontrolled Keywords:American foulbrood, diagnosis, spore load, adult honey bees, Apis mellifera ligustica
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/11 Entomologia generale e applicata
Area 07 - Scienze agrarie e veterinarie > AGR/12 Patologia vegetale
Divisions:001 Università di Sassari > 01 Dipartimenti > Protezione delle piante
Publisher:Università di Bologna, Dipartimento di Scienze e Tecnologie Agroambientali
ISSN:1721-8861
Deposited On:20 Apr 2012 10:01

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