Fig. 2.

Effects of lactic acid on V. destructor arolia during the first six hours after the treatment of honey bees. (a) Altered arolia from four different fallen mites between zero and six hours. (b) Kinetics showing that the fluid is drained from the arolium. The arolium from one mite artificially detached from its host showed a modified shape which cannot be filled with fluid anymore (t1-t6 stands for the images taken over time). White arrows indicate the fluid. Black arrows indicate the arolium. (c) Arolia with a normal cushion-like shape from four control parasites.