Well, it's a bit different with viruses as they're not directly part of the food chain for complex organisms - unlike mosquitos that are important food source t

Well, it's a bit different with viruses as they're not directly part of the food chain for complex organisms - unlike mosquitos that are important food source to many insects, fish and birds. For instance for some fish and their fry the mosquito larvae are the primary food source, so if you destroy the complete population of mosquitos you might also severely affect some fish species. Some spiders and birds will also be left hungry. That can then affect other ecological niches up the food chain, perhaps even cause a collapse of the whole biotop system.