Last year it became illegal to sell or apply pesticides for cosmetic lawncare in Ontario, Canada. It seems like a no-brainer risk versus benefits analysis: the benefit is ...hmmm, just cosmetic...while the risks are real, documented, and pervasive. But somehow the allure of a green, weed-free lawn keeps conquering rationality. A year later, does the preliminary data on the effectiveness of Ontario's ban.
The results are dramatic: three pesticides estimated to account for half of lawn care product applications dropped by 86% (2,4-D), 82% (dicamba), and 78% (MCPP: 2-methyl-4-chlorophenoxyacetic acid). On the other hand, concentrations of glyphosphate (Roundup) and carbaryl did not drop significantly. The results for glyphosphate (Roundup) are attributed to continued use of this pesticide in certain exempted applications. The carbaryl results are not explained; perhaps this is due to the persistence of carbaryl in sediment.
Continuing feedback on Ontario's "experiment" can only help support the use of alternative herbicidal treatments and the expansion of bans on cosmetic pesticides, as well as restrictions on the use volumes for other purposes. Well done, Ontario!
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