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-Scotch Thistle:Biennial <br /> Characteristics:2 growth years.Rosette grows low to the ground with wide spiny leaves.Mature plant grows <br /> tall 2-3 feet with purple flowers. <br /> Aim <br /> f 4 <br /> r , <br /> T <br /> r �r <br /> > pr <br /> o <br /> Scotch thistle rosette Scotch thistle mature plant Scotch th st e f oo;er head <br /> Methods of Control: <br /> -Chemical:Spray plants before seed head production which happens usually middle of summer.Pay attention to <br /> drought conditions as this can accelerate when the seed heads form.Coverthe entire plant while spraying. <br /> -Manual:If plants reach seed head production.Clip and bag flowers then spray the rest of the plant to prevent <br /> more flowers from forming.Older dead growth is easily hand pulled during the fall and might be useful to remove <br /> seeds from contributing to the seed bank <br /> Effective Herbicides:(Application rates shou d be derived from product labels specrfato weed species and tank mix,additionaiproducts maybe used but <br /> shou'd be a herb'c,de specific to treating target species as per product label) <br /> -Milestone(amino pyralid) <br /> -2,4-D <br /> -Chlorsuifron(Telar XP,Chlorsulfron 75) <br /> Glyphosate(in reclaimed areas it may cause damage to desirable grasses) <br /> Figure 8.Specific practices for the control of Scotch Thistle. <br />