Alkassab, Abdulrahim

Frommberger, Malte

Pistorius, Jens

Wernecke, Anna

English

JKI Open Journal Systems (Julius Kühn-Institut)

10th Young Scientists Meeting, Siebeldingen, Germany, November 08-10, 2017 Alkassab et al. Plant protection products in the mix - semi-field studies on effects on honey bees Abdulrahim Alkassab1, Anna Wernecke1, Malte Frommberger1,2 and Jens Pistorius1,21Julius Kühn-Institut, Institute for Bee Protection, Braunschweig 2Julius Kühn-Institut, Institute for Plant Protection in Crops and Grassland, Braunschweig E-mail of corresponding author: abdulrahim.alkassab@julius-kuehn.deIn a series of screening laboratory ex-periments on tank mixtures in a spray chamber, synergistic effects on the mor-tality of adult honey bees were observed for some combinations of pesticides when exposed by contact exposure.  While in the laboratory studies higher numbers of different combinations are screened, to understand the potential additive or synergistic mode of action for different substances and to identify products and combinations of concern, further studies are needed to assess the potential risks for bee colonies. There-fore, higher tier studies in a semi-field setup were conducted to assess effects of these mixtures to honey bees under more realistic conditions, thereby in-cluding the effects from both contact and oral exposure.  To assess the risk on honey bees in a worst case scenario, honey bee colonieswere confined in tents with flowering phacelia as a highly bee attractive crop. Different field-realistic mixtures of PPPs were sprayed during bee flight. The in-fluence on adult mortality, behaviour, flight activity, and colony development was investigated. Our results showed that the combina-tion of thiacloprid and an EBI-fungicide cause significant adverse effects on adult mortality, behaviour, and flight activity. These effects last from the day of application until two days after appli-cation. Our results suggest that the application of this mixture poses a possible risk on the honey bees foraging on treated plants under semi-field conditions. Therefore, it is necessary to check whether the application of this mixture harms bees on colony level in a field realistic scenario, too. Berichte aus dem Julius Kühn-Institut 192 43

Plant protection products in the mix - semi-field studies on effects on honey bees

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Plant protection products in the mix - semi-field studies on effects on honey bees

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