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,:. ~ , <br />.'INTEGRATED PEST MANAGEMENT <br />°.• . OF SELECTED WEEDS _ <br />~Na,.siagl ron.'r.o. ~me.thq~should•be , <br />,,use.d;,t n;•.mamag rgg:~zN~eds: ,_`A : comb i nat.i on <br />~of^;method's}iIPM7;~s ou,ld be~uaed. An <br />rntegrated:`p aria emegt.pl'an deals <br />wi th' preventi3~o ~as~•ief~i~a's:'contro.l . <br />'Erad.ication of .weed species is not a <br />pc~ac t i ca,l ,, goo l,'.t5u t'( reducing.;;,,` <br />e.infesta,ti,on'~~nmarag 1~~~lEVels , <br />9:shoirld~:be t e~`ab er=~'~ve'`S',~-~`'-4 ., <br />CANADA.THISTLE• <br />r .ar'c t4 - ., i' .-~' <br />~~,~~..k. r- <br />Cu9c. u r a 1'.• .. <br />ive way <br />~n na ui-r:: ca-c~ nm n¢ mp ~~: vi <br />perenniah;.gra' es"""wi ~•nhitiit .the <br />re;tablishmen ~f~t iswG~~.. <br />~~_k <br />Overgrazing 5`s'~;a~m~,~.d k'~;use of <br />perennial o-~ed~iin~as,~^~o~: r~In Douglas <br />County, ane,h'brse ~requrres. 35. to a0 <br />acres of pasriii`e,-land`l~if'-;rio <br />supplemental feed is'provided. <br />Pesidents• shou•ldlcon~idery the.;above•. ,., ; <br />iar_ts when planning recrea.t~onelror • <br />hobby activities ars~•i~f'~perta'ins`~to'`''. ~'.~ <br />horses.. 'A general~ruLei o ~ thumb: to r. ; <br />prevent overgrazin~g,~,is',the ~ake-half <br />leave-tralf princip'l~e~t`~A~sYend~~'of''~7.'~-` <br />grass will maintain or even improve.;'" <br />its condition.if no more than one-half <br />of its annual production is used. In <br />other words, animals could. graze:; ~ . <br />until, on average, fifty percent of. <br />the grass ha=_ been utiliied:l•Animals ' <br />would then be remoyed':unZil?,the.r~~j :; ;; <br />vegetation recovers its original <br />height. ` <br />Other cultural methods include: <br />-fertilization when necessary (A soil <br />test is the best way to determine <br />fertilization on a site. <br />Contact the Douglas County Extension <br />Office far soil test kits.) <br />- water manayement <br />- where the perennial vegetation has <br />been depleted, reseeding adapted <br />varieties is recommended <br />-disturbed areas should be <br />revegetated.as soon as passible to <br />prevent weed invasions <br />Biological <br />Insects are being utilized as a means <br />for long-term management of weeds. In <br />Colorado, insects have been released <br />on an experimental basis to control <br />Canada thistle. At this time, they <br />are not available to the general <br />public. <br />Mechanical <br />One season of intensive cultivation <br />from spring until freeze-up will <br />usually eliminate over 90% of Canada <br />thistle. Cultivate every 14 to 2L <br />days, using a sharp duckfaot <br />cultivator with at least 3 inch <br />overlap of shovels or blade-type <br />implement. Cut thistle plants no more <br />than 4 inches below the surface. <br />Persistence and proper timing are <br />important. <br />Chemical <br />Pasture and rangeland <br />- 1 quart Banvel plus 1 quart <br />2, 4-D/acre <br />OR <br />- 2 quarts Banvel/acre <br />OR <br />- l quart Tordon•/acre <br />Winter wheat <br /> <br />- .09 lbs. Ba m~el plus 1/4 lb. <br />2, 4-D/acre. Apply in the spring <br />immediately after winter dormancy <br />breaks but before the plant begins to <br />joint. <br />OR • <br />-.1 Ib. 2, 4-D/acre in the spring <br />after tillering as near the five leaf <br />stage as possihle but before the boot <br />or flowering stage. <br />• Tordon is a restricted vse pesticide <br />and a certified pesticide applicators <br />license is required to purchase and <br />apply this chemical. <br />