In either case, evolution of resistance would involve the appearance of features to circumvent the means of resistance. For insecticides, mosquitoes would need to evolve a biochemical mechanism to inactivate the insecticide. For Wolbachia, a means of killing the bacteria or of circumventing its way of giving resistance to mosquitoes would need to evolve in the Plasmodium.
Work Step by Step
Use you imagination— past chapters show that resistance involves genetic changes altering how biochemistry works. Then try to imagine what specific changes are needed for each of the two cases presented.