22.214.171.124.3. Test conditions
1) As mentioned in section 126.96.36.199.2., the size of the tunnels should be adapted to the size of the used colonies, but a minimum size of 40 m² floor space is recommended in the OECD 75 guidance document. The minimum height of the tunnels should be 2.5m, to guarantee an unhindered flight of the bees. The covering gauze should have a maximal mesh size of 3mm. The test crop should be attractive to honey bees. Suitable are for example Phacelia tanacetifolia, Sinapis arvensis and Brassica napus.
2) During the whole testing period, the colonies should be supplied with water. A water feeder should be placed into each tunnel as water supply for the bees. During product application, the water feeder should be removed from the tunnel.