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Page 17 of 23 <br />• Houndstongue <br />• <br />r.• <br />~. <br /> <br />~' <br />Appendix 1 <br />Houndstongue contains toxic alkaloids that stop liver cells from reproducing. Therefore, houndstongue <br />reduces livestock and wildlife forage and grazing animals should be kept away. Animals may live six or <br />more months after eating a lethal dose of houndstongue. Houndstongue is an early sucessional species on <br />recently disturbed sites. Houndstongue is common on gravelly, alkaline soils. Maintaining a healthy <br />population of native perennials is the best way to prevent the establishment and spread of houndstongue. <br />Mechanical Control of Houndstongue <br />Mowing second year plants during flowering but befom seed maturation reduces seed production and may <br />kill the plant. <br />Chemical Control of Houndstongue <br />l'icloram at 0.25-0.5 lb., 2,4-D, or dicamba at 1.0 lb., or metsulfuron at 0.6 oz. ai/acre applied in spring <br />provides control of houndstongue. Spring treatments with pocloram, dicamba, or metsulfuron are more <br />effective than fall treatments. Chlorsufuron applied 0.5 Ib. ai/ac gave complete control when applied any <br />time beginning with the rosette stage until tl~e bolted plant had attained 10 inches in height. <br />• <br />MANAGEMENT <br />