The end of synthetic pesticides in Switzerland?

Launched by a group of apolitical citizens in the canton of Neuchâtel, the initiative "Pour une Suisse libre de pesticides de synthèse" (For a Switzerland free of synthetic pesticides) calls for an outright ban on these products throughout the country, as well as the import of foodstuffs that have used synthetic chemistry in their production. What motivates the initiators to make such a radical demand?