Frommberger, Malte

Joachimsmeier, Ina

Pistorius, Jens

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JKI Open Journal Systems (Julius Kühn-Institut)

Nachwuchswissenschaftlerforum / Young Scientists Meeting 2011  Malte Frommberger et al.    Berichte aus dem Julius Kühn-Institut 162, 2011  There’s something in the water - Guttation and the risk for honey bee colonies (Apis mellifera L.): a worst case semi-field scenario in maize  Malte Frommberger1, Jens Pistorius1, Ina Joachimsmeier1,2,  1Julius Kühn-Institut, Institute for Plant Protection in Field Crops and Grassland 2Ruhr-Universität Bochum, Department for Biology and Biotechnology malte.frommberger@jki.bund.de The study was performed under semi-field conditions in Lucklum (Braunschweig, North Germany), in seed treated (Clothia-nidin) and untreated maize. The tents (4 treatment and 2 control) had an area of 96m2 (16 x 6m) each and were covered with a gauze. The study was repeated twice, in the first run (BBCH 13-15) with two variants, one with and one without artificial water source containing unconta-minated tap water. In the second run (BBCH 15-19) all variants had an artificial water source. Bee colonies used were of similar size with approximately 10.000 bees. The adult mortality of bees was as-sessed in dead bee traps and on linen sheets in the crop. The flight activity and behavior of bees at the entrance of the hives and in three flight squares in the crop were determined once daily. The observa-tion time in the tents were 10 days, the observation of brood development for 100 brood cells per hive was conducted nearly for four weeks. During the whole observa-tion period the occurrence of guttation was documented. In the first run of the study, in the artificial extreme situation without any additional water supplies a high impact on mortality and also on the brood devel-opment was observed, indicating the sensi-tivity of the test system but representing an unrealistic worst case scenario. In va-riants with treated maize and additional water supply, no effects on adult mortality and brood were observed. The results of the second run are also with no effects on adult mortality or brood development.     58

There’s something in the water - Guttation and the risk for honey bee colonies (Apis mellifera L.): a worst case semi-field scenario in maize

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There’s something in the water - Guttation and the risk for honey bee colonies (Apis mellifera L.): a worst case semi-field scenario in maize

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