I have a insect problem on my Meyer Lemon and Key Limes tree. I had noticed the leaves on my lemon tree start to yellow and brown up and then curl up and fall off the tree. On closer inspection some of the leaves looks like they have been eaten. On my lime tree I found a spiders web which I have cleared off but now have noticed that the leaves on my lime tree are starting to be eaten as well. Also there is a sticky residue on some of the leaves on the key lime tree. After watering my trees last week i noticed little flying insects around my trees so I now know I have an insect problem. I have been search though the threads to find a proper insecticide for citrus but couldn't find one. What should a use to free my trees of these pests?