I am growing okra, dwarf long pod green, in large, 25 gallon, nursery pots. One pot of okra had a large insect infestation, tiny black things, that is killing the leaves, also a lot of ants are on the leaves. Any idea what these things are and what I can do to get rid of them? I have some summer oil but the label has gotten wet so can't read it! This is the first summer I have tried okra in containers and would like to give the plants a chance to produce.