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Pagel 8 of 23 <br />• Hoary cress (White Top) <br /> <br />Appendix ~ <br />Hoary cress is typically found on generally open, unshaded, disturbed ground. Goary cress grows well on <br />alkaline soils that are wet 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 sagebrush. Hoary cress Bowers from May to June, are self-incompatible, and are pollinated <br />by insects. Hoary cress will set seed by mid-summer. If conditions are favorable, a second crop of seeds <br />can be produced in the fall. Hoary cress spreads by creeping roots and by seeding. <br />Mechanical Control of Hoary cress <br />Mowing 2-3 times a ear for several years may slow the spread and reduce seed production of hoary cress. <br />Mowing may increase the effectiveness of subsequent herbicide application. Mowing should be conducted <br />during the bud stage and repeated when the plants re-bud. The effectiveness of a mowing program can be <br />increased by planting perennial grasses as competitors. <br />Burn Control of Hoary 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 use anon-ionic surfactant with the herbicide. 2.4D + <br />MANAC:EM ENT <br />