General evolution of the colony during the test

Special attention should be put on the strength and vitality of the colony (see Delaplane et al., 2013b). Should scales be placed on the colonies of study, weight evolution could be used as well as variable to compare treatment and control colonies (Human et al., 2013). The same could be done in case bee counters are installed.

These observations should be done on a daily basis from one week before the day the colonies are placed into the field and until the end of blossom of the treated/control crop. Afterwards, the observations can be done on a weekly basis up to the 42 days.