hi there, I have taken food onto planes many of times, plane food leaves alot to be desired.
there are even resturants in the departure lounge that do takeaway (they know you're going on a plane) and there are them mini market type shops that sell fruit and food and stuff.
so... in my long winded way i am saying i think it's ok.
As has been said, as long as the fruit isn't entering the other country, it is fine. The air stewards spray that stuff before they open the doors and let you off.