20-year Forest Restoration Plan - City of Kirkland

Green Kirkland Partnershipthe bark into the sapwood• Using a syringe, within 20-30 seconds after drilling, fill thehole with undiluted herbicide (with water-soluble indicatordye). Having one team member whose specific task is toinject the herbicide after another team member drills the holeis recommended• Repeat this process at 2 inch intervals around the trunkFrilling or chipping method for trees and shrubs greaterthan 4 inches in diameter at the base:This technique should be used before fruit production so thatthe standing dead plant does not have fruit on it.• Use a sharp chisel or axe to make a deep downward cut at a 45ºangle through the bark into the sapwood. Be sure to leave thechips (frills) attached to the trunk at the base of the cut• Paint the inside base of the chip within 20-30 seconds ofcutting with approximately ¼ to ½ teaspoon of undilutedherbicide (with water-soluble indicator dye). Having oneteam member whose specific task is to paint the herbicideafter another team member cuts the chip is recommended• Repeat these cuts around the tree• Do not completely girdle the plant—leave at least ½ inchbetween the cutsFor all methods:It is imperative that treated cut stumps and injected or frilledtrees and shrubs be checked for re-sprouts every 2 to 6 monthsfor a minimum of 2 years after treatment. If plants resprout, aftersufficient regrowth has occurred cut the shoots and paint thestumps with herbicide (see above). If no herbicide is used forre-treating, repeated cutting will be required to weaken andeventually kill the plant over time. This is a more labor-intensivemethod and will require diligent follow-up visits over a periodof at least several years to remove suckering growth resultingfrom the initial treatment.Himalayan and Evergreen Blackberries(Rubus armeniacus, R. laciniatus)Eradication and control methods for these two species are thesame. Blackberry can be found in upland areas, as an understoryspecies along forest edges, and in dense monotypic stands inmore open areas. Removal methods include hand-pulling withroot removal, repeated cutting or mowing, cutting and dabbingstubs with herbicide (cut and dab), or combinations of two ormore of these techniques. Generally speaking, hand-pulling isreasonable only for isolated plants and small infestations, or formaintenance around trees or shrubs. If herbicide is used, a glyphosateor triclopyr amine herbicide is recommended: Roundup®(glyphosate with surfactant) or Garlon 3A® (triclopyr amine)for upland areas, and Rodeo® (glyphosate without surfactant)for areas within 100' of an aquatic resource. Generally speaking,herbicide should be applied between flowering and fruitset. Triclopyr amine is most effective when used during theearly summer, while glyphosate is most effective when usedfrom midsummer to late fall. Do not apply herbicide when theplant is under stress: extreme heat or cold, drought, waterlogging,or disease. Do not apply herbicide when wet weather isanticipated. Contact King County Noxious Weed program forinformation.The method(s) chosen for blackberry removal dependsmainly on the size and density of the patch, the steepness ofthe slope, time of year, existing native vegetation, and theavailability of labor and other resources. Except for areas withsparse occurrences and a relatively intact healthy existing plantcommunity, blackberry removal should not be done unless subsequentreplacement planting is planned. For sparse occurrences,hand-pulling or cutting and dabbing the stumps with herbicide76