After the [[cleansing flight]] it should be evaluated if the colony needs to be treated for Varroa. To find out if the colony needs to be treated, count the number of dead mites on the bottom board over 7 to 10 days. If you find more than an average of 1 mite per day you should
treat the colony.
* [[Oxalic acid treatment|Oxalic acid]]. Trickling of 4ml 3.2% per fully occupied beeway on adult bees.