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Page IS ol'23 <br />Hoary cress (White Top) <br />Appendix 1 <br />Iloan, cress is typically found on generally open, unshaded, disturbed ground. Goan cress grows well on <br />alkaline soils that are wet in late spring and generally does better in areas with moderate announts of <br />rainfall. It is widespread in fields. waste places, meadows, pastures, croplands, and along roadsides. I loary <br />cress is commonly found with saltcellar, antelope hincrursh, bluehunch %,.Thcatgrass, big sagebrush. and <br />Wyoming big sagebrush. Iloaty cress floxvers 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 hnres a car 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 lvhen the plants rc-bud. The effectiveness of a mowing program can he <br />increased by planting perennial grasses as competitor:,. <br />Burn Control of Hoary cress <br />Is not recommended since Iloary cress has a rapid growth rate when compared to non noxious weeds. <br />Chemical Control of Hoary cress <br />Eloarv cress is most commonly controlled with herbicides. I lowever, multiple applications are usually <br />needed to provide lasting control. The hest tinnc to apply herbicides is in May Or 1urrC before flowering <br />11ne non-crop herhicides nnctsulfitron and chlorsulfuron are the most cffective herbicides as long as the <br />plants still have green tissue. It is important to use a non-ionic surfactant with the herbicide. 2.4n <br />NIAN,1.GENIF'S" .