Feeding treatments of in vitro reared honey bee larvae for the Bt-pollen bioassay.

aTreatment maize 1 expresses three Bt-proteins encoded by the genes cry1A.105, cry2Ab2 and cry3Bb1 from Bacillus thuringiensis that confer resistance against certain lepidopteran and coleopteran pests and additionally expresses the CP4 epsps gene for glyphosate-tolerance. Treatment maize 2 expresses a single lepidopteran specific Bt-toxin encoded by the gene cry1Ab. In addition, control treatments, tested plant varieties, number of larvae, colonies and counted pollen grains per 2 mg pollen treatment are indicated.