how do you get rid of flies about level 500

Patty_Bosch

I would like to know how to get rid of the flies on level 500 farm heros saga? Thank you very much for your help.

Lisa_Yates_

You have to have 3 cropies next to them (you have to do this twice )  but if you open one and then have 3 cropies land next to it again they will close. All of them have to be open at the same time for them to fly away