Objective: This aim of this work is to review the literature on the ecological risks of systemic insecticides and to provide perspectives for future research.
Methods: We collected basic data such as pesticide shipments from the websites of the Food and Agriculture Organization of the United Nations (FAO), the National Institute for Environmental Studies, and the Ministry of Agriculture, Forestry and Fisheries. We also searched PubMed and J-Stage for reports using the keywords Pesticide, Insecticide, Neonicotinoid, and Systemic Insecticide.
Results: According to FAO estimates, the amount of pesticide used per area of cropland in Japan in 2021 was 11.2 kg/ha, the 14th highest among 184 countries with similar statistics. The overall amount of insecticide used in Japan has been decreasing year by year, but the amount of systemic insecticides, including neonicotinoids, has remained stable. Systemic insecticides have been widely detected in rivers and coastal seawater throughout the country. The ecological risk of pesticides in Japan's rice paddies has been said to be decreasing in recent years, mainly due to the reduced use of organophosphate pesticides. However, in Europe and the United States, a link has been suggested between systemic pesticides and bee decline, and in Japan, it has been reported that the same pesticides have been involved in the decline of the Sympetrum frequens population. Japan's pesticide residue standards for systemic pesticides are more lenient than those of other countries and there are concerns about their adverse effects on ecosystems.
Conclusion: Pesticides, including systemic pesticides, are fundamentally biologically toxic and therefore pose an ecological risk. In addition to preventing health damage caused by pesticides, research and studies aimed at preventing adverse effects on ecosystems are also important from the perspective of planetary health.
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