I will use Neem oil during flower but am careful to not spray it on or near the buds. I also used Azamax to eliminate thrips once. when you use it as a drench in the soil, and as a spray on the leaves, the plant actually absorbs it and it makes the plant taste bad to the little munchers. Plus its supposed to make them quit reproducing somehow.
It's also supposed to biodegrade from the soil and from within the plant, according to what I read on it. I don't know how true that is but when we smoked ours, we couldn't tell any difference from it being there. I don't know if it will work on leaf hoppers though.
