In field plantings, grantular 2-chloro-4,6-bis(ethylamino)s-triazine (simazine) and 3-(3,4-dichlorophenyl)-1 1-dimeth yllurea (diuron) wvere the most effective herl)icides, but inljulred Spiraea miiedia, S. trichocarpa, Syringa prestoniae and Phlysocarpus opulifolius. I)iuron also injuLredI niewvly plantedI evergreens. Grantular 3aminio-2,5-(iclh lolrolenizoic acid (amiben), isopropyl N-(3-chlorophenyl)carbamate (CIPC), 2-chloroallyl diethyldithiocarbamate (ClDEC) and 4,6-diilnitro-o-sec-buty lphenol (DNBP) did not cauise injury. Preplantinig applicationi of ethyl N,N-di-n-propylthiolcarhamate (EPTC) redutced the vigor of the deciduotis shrubs. Chanaecvparis and(Thluja species were tolerant to simazine uinder greenhouise conditioins, while toleranice in Juniperus varied according to