Bonsai treatments against bugs, insect, aphids
I use this concoction and it works on aphids, mealybug, etc. I use Neem oil which I mix 1 1/2 tsp per quart of water plus 1/2 tsp of mild liquid dish soap per quart of water as an emulsifier. Shake well and spray the diluted solution generously on all the affected area. use once every 2-4 weeks. Apply early in the morning of late afternoon. Do not apply Neem oil in direct sunlight. Always spot test plants to first for sensitivity to spray. I am in Texas and it works for me. Since I do not know where you are located, you might want to check it out first.
Quart of water = 900 ml (almost one litre)