Biological weapon

When we first moved into this house, it needed a lot of landscaping work and I introduced 'Ficus Bejamina', naked name 'weeping fig' to use as an extension hedge at the front and the backyard. I won't go that far to call myself a horticulturist, but I pay attention to what grows in where when I am outdoor.

Lately I found I am loosing leaves from the Ficus Bejamina, the top of the hedge looks fine and full, the middle and close to the tree trunk has lost almost 50% of its leaves. I know my worst nightmare have come, this pest named 'Ficus White Fly' has attacked my plants. It got this name but it is actually not a fly, it's in the family of a pest called 'Aphid', which I noticed I have it on the hibiscus at the backyard but I tried not to spray with chemical treatment as best as I can.

This time, I had to ask my landscaping company to apply a chemical solution, which I don't like but I had to. This is a very expensive insecticides costs over $130 / 5 gallon, but my landscaper said I don't need to use the whole package of it, he would apply it to the tree trunk and it should be good for 6 months to 12 months.

now after he applied the chemical, I introduced a biological weapon which is an enemy of 'Ficus White Fly', my beloved 'Lady Bug', it is actually a type of beetle which eats the eggs of the bad ones. Hopefully my biological weapon would work and save me from using chemical again.