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Pau 1fiof23 <br />Hoary cress (White Top) <br />77-71 <br /> <br />Ai <br />Appendix I <br />1-loary cress is INTically found on generally open, unshaded, disturbed ground. Cioary cress grows well on <br />alkaline soils that are Act in late spring and generally does better in areas with moderate amounts of" <br />rainfall. It is widespread in fields, waste places, meadows, pastures, croplands, and along roadsides. Hoary <br />cress is commonly found with saltcedar, antelope bitterush, bluebunch wheatgrass, big sagebrush, and <br />Wyoming big sagchntsh. Hoary cress flowers from May to June, are self-incompatible, and are pollinated <br />by mwcts Hoary crew will set seed by mid-summor If 'condition,; ditions are favorable. a second crop of spuds <br />can be produced in file fall. Hoary cress spreads by creeping roots and by seeding. <br />Mechanical Control of HoarN ores, <br />Mowing 2-3 times a car for sevcnd years may slow the spread and reduce seed production ot'hoary cress. <br />Mowing may increase the effectiveness of subsequent licrhicide application. Mowing should he conducted <br />during the bud stage and repeated "'hell the plants re bud. The effecuyel ess k' a mowing program can be <br />increased by planting perennial grasses as competitors. <br />Burn Control of Mao cress <br />Is not recommended since Hoary cress has a rapid growth rate when compared to non noxious weeds. <br />Chemical Control of Hoary cress <br />hoary cress is most commonly controlled with herbicides. However, multiple applications are usually <br />needed to provide lasting control. The best time to apply herbicides is in May or June before flowering. <br />The non-crop herbicides metsulfuron and chlorsulfuron are the most effective herbicides as long as the <br />plants still have green tissue. It is important to Ilse a non-ionic surfactant with the herbicide. 2.4D <br />MANACFM ENT