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Basal bark treatment is the application of a Fire is an effective tool for controlling woody chemical to the lower bark of the tree. Garlon 4 is plant species. Fire should be considered a sup- preferred for this application. pression tool though repeated burns may exhaust the weak rooted buckthorns' ability to compete I1 11 10, resulting in mortality. It is most effective against seedlings and small saplings. Garlon 4 is non-restricted use and comes in 2.5 gal. containers. Active ingredient - triclopyr Heavily colonized understories often have too 61.60/'0 (ester). little fuel to sustain a hot burn. Preplanning & preparation for a burn in public areas can be more Application: Dilute 1 to 4 with diluent oil. Apply costly than anticipated. Be aware of all local a with low pressure sprayer with ultra low volume state fire codes, permits, ordinances. etc. wand using a Y-2 or Y-3 nozzle. Completely , encircle basal 10" of tree leaving. Thoroughly wet bark but NOT to point of runoff. Colder tempera- tures may adversely affect spray pattern. Read Mechanical removal is not practical on large label for other applications using Garlon 4 includ- heavilv colonized acreage. Where plants are ing cut stump treatments. sparse it can be the most expedient and environ- mentally friendly course of action. Larger trees Advantages: doesn't require cutting top of tree can be readily dug, pulled and chopped out of the off, price is more cost effective with high usage. ground. Buckthorn does not readily resprout from lower user risk (does not carry same eve risk as underground roots. Buckthorn typically has thin Garlon 3A), high efficacy. season long use. wiry roots and in most woodland soils it pulls quite nicely_ up to 3/8" caliper. Disadvantages: cost/container size not practical for small applications, must be mixed (oil ,I ZZ" diluent), ester formulation may volatilize and / cause off site damage to non-target plants in hot Biological controls are not available for buck- weather. thorn at present. —" Author: Foliar Treatments: Broadleaf herbicides labeled Peter M. Dziuk for woody brush control can be effective against Pest Management unit, MDA buckthorn seedlings and stump sprouts. Careful survey for desirable species within a control area Reviewed by: should be considered before application. Charlie Evenson Resources Division. Hennepin Parks _ A John Sierk Krenite S is a brush control agent containing Ag Chem Registration Unit. MDA fosamine 41.5%. Mode of action is inhibition of bud break the following growing season after Design and Layout: treatment. In buckthorn control the theory is to Peter M. Dziuk spray green foliage (ideally seedlings) late in Pest Management Unit, MDA . season after desirable species have turned fall color. Hennepin Parks reports zero to poor con- This fact sheet summarizes most recent trol in late season application trials. Distributor control methods used by field practitioners. will further study application and efficacy. Page 3