Talstar P (Talstar One) can last in the soil for up to 5-7 years, no edibles should be planted in an area treated with it for this reason. It would be best to remove and replace the top layer of soil if just sprayed before doing so.
Talstar P (Talstar One) can be applied once monthly to the exterior of the structure and on foliage for mosquio control. If you treat the areas that the mosquitoes harbor, you will have great success. They do not have to be present for eradication. Please take a few moments to review our treatment article on How to Get Rid of Mosquitoes for more information on a successful program.
I need more information to answer your question accurately. Which Talstar granules did you use? Which Amdro product did you use? You are welcome to give us a call at 866-832-6240 as well.
According the University of Florida Extension, the active ingredient in Talstar (Bifenthrin) can be used on coconut trees as long as they are non fruit bearing. Please refer to Table 7 for a list of approved insecticdes in the State of Florida. You may also reach out to the Local Cooperative Extension office to speak with them directly on application recommendations.