Experts address your farming concerns

READER: My tomatoes greenhouse was infested by small butterflies. I thought there was never going to be any harm, but after two weeks my ripe fruits started falling down. On my assessment I realised there were very tiny worms, I quickly sprayed with duduthrine but this was never to be because I lost all the tomatoes. What might have been the cause of the butterflies and the remedy to it?

{Daniel}