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| I have luck spraying Roundup with Sylgard added to it early in the morning while the dew is still on the horsetail. Sylgard is a non-ionic surfactant and its chemical composition is 76% siloxylated polyether. The horsetail sometimes dies and turns brown right away or it goes slowly but won't be there for harvest and usually I have it controlled for 3 years until the field is soybeans again. | |
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Field Horsetail Weed
