They do but chances are it's not 100% effective.

Rather, "there is no evidence to show that using insecticide to kill mosquitoes inside aircraft cabins is effective in preventing introduction and spread of mosquito-borne diseases."

https://www.epa.gov/mosquitocontrol/aircraft-disinsection

Not sure where the idea came from that spraying the cabin aisle would penetrate the luggage bins, cargo hold, under the seats, or really anywhere.

	▲	nkmnz 2 hours ago \| parent [-]
		1. Absence of evidence is not evidence of absence. 2. Risk is convex, so every risk increase by measures not taken is multiplicative, not additive. The real question must be: does the disinfection do more harm than it provides reduction of risk.