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Page 17 of 23 <br />Houndstongue <br />.a. 1 <' <br />jL T <br />AmrA <br />Appendix I <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. Iloundstongue is an car)\- sucessional species on <br />recently disturbed sites. I loundstongue is common on gravelly, alkaline soils. Maintaining a healthy <br />population of native perennials is the best wav to prevent the establishment and spread of houndstongue. <br />Mechanical Control of lloundstongue <br />MoN%ing second year plants during flowering but before seed maturation reduces seed production and may <br />kill the plant. <br />Chemical Control of Houndstunkue <br />Picloram at 0.2S_0.*; lb.. 2,4-D, or dicamba at 1.0 lb.. or mctsulfuron at 0.6 oz. at:acre applied in spring <br />provides conrol of houndstongue. Spring treatments with pocloram, dicamba, or metsulfuron are more <br />effective than fall treatments. Chlorsufuron applied 0. Ili. ai/ac gave complete control when applied any <br />time beginning with the rosette stage until the bolted plant had attained 10 inches in height. <br />NIA %, 1% GEN1L\ f