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WCND | http://paraquat.com/knowledge-bank/paraquat-fact-sheet
Rainfall a few minutes after spraying has little or no detrimental effect on the performance of paraquat. Sufficient paraquat rapidly enters leaves before rain can wash significant amounts away. Even in the tropics, paraquat is consistently rainfast only 15–30 minutes after application.
Unlike most herbicides, paraquat is also effective under low temperatures when weeds are making little active growth. This makes paraquat a suitable option for early season seedbed preparation and for many orchard crops in the autumn.
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Gramoxone
