Answer: Sevin is registered for use against corn earworm, but Sevin is highly toxic to bees so it's not something that we often recommend. A drop of mineral oil placed in the tip of each ear should stop the earworm from crawling down into the ears of corn. The timing is critical - too soon and you'll hamper pollination; too late and the earworm will have already entered the corn. Wait until the silks turn from green to brown (which indicates the ears have been pollinated) and then place a drop of oil into the top of each ear.
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