20-year Forest Restoration Plan - City of Kirkland

20-Year Forest Restoration Plan• Herbicide can be used from spring to fall, as long as temperaturesare above 50 o F. However, the herbicide is most effectivewhen day time temperatures are between 70 o and 80 o F. Inareas where native plants are interspersed, it may be advisableto apply herbicide prior to emergence of these species, or todelay application until they have died back or are dormant• Using a weed whacker, wound the vinca leaves. Do not completelymow the patch—the point is to wound the leavessufficiently to improve herbicide uptake while maintainingintact vines and some intact leaves for herbicide translocationto the roots• Within a maximum of 5 minutes after wounding, use a backpacksprayer to uniformly spray the patch with a mediumto heavy treatment. Having one team member whose specifictask is to apply the herbicide after another team memberwounds the vinca leaves is recommended. For upland areas,use a 3% solution of Roundup® (glyphosate with surfactant)with a water-soluble indicator dye. For areas within 100' ofan aquatic resource use a 3% solution of Rodeo® (glyphosatewithout surfactant) with a water-soluble indicator dye. Spotspraying (even with Rodeo®) is not recommended for areasadjacent to wetlands, streams, or other aquatic resources.Hand-pull the vinca in these areas• It is imperative that the treated area be monitored regularlyfor any vinca regrowth. It may be necessary to respray. If possible,hand-pull any growing vinca whenever you find it anddispose of it properly• Subsequent replanting should be planned when treatingdense patches of vinca in areas that have a minimal numberof existing native shrubs and herbs. The new planting areasmust be monitored •83