Kindly Give Us Remedy For This White Coloured Mosquito Which Is Spread To Northern Andhra Pradesh

It Came Through Air One Year Back. Firstly It Affected The Coconut Trees Later It Was Spread To Banana Trees. For Example, If We Rake An Affected Tree Leaves The Upper Part Of The Leaf Is Completely Black Smoke Like Presipitate And The Lower Part Of The Leaf Has This White Coloured Mosquitos Colony's. Ultemately Our Coconut And Babana Crops Left Us At Loss. Harticulture Daparment Has No Idea And Control Methods. Kindly Help Us and Help Farmer.