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• r.T <br />1.;uulotvncisishould treat with dttra care so <br />ns to prevent wntnminntion of water sources <br />;trot olT target damage (gardens, or desirable <br />trees. T1te Following are some options for <br />rltenticnl treatments of diffuse & spotted <br />knnpwcctl: <br />..,.,. , <br />• 2,4-D (around trees and shallow <br />water tables) at 2gts/acre in the early <br />bud stage in the spring and a fall <br />retreatment:' <br />• Roundup•@ 1/l gallon/acre in the <br />spring at the bloom stage. , <br />• Banvel can be used if treatments are <br />at least 2.5 the height,from a tree <br />trunk and the daily high temp. is less <br />than SSF for the next three days. <br />Also the water table should be more <br />• than :10 feet beneath the surface. <br />Apply @ igt/acre at the~same timing <br />• Tordon`22K'is-the most effective on <br />knapweeds.@:lpt/acre,but should be <br />used only if treatments are at least <br />2.5 the height from a tree'trunk and <br />the water table is more than 10 feet <br />beneath the surface. <br />• Curtail (a premix of clopyralid & <br />2,4-D amine} @ 2gts)acra <br />• Transline/Stinger @ 3/4pt/acre for <br />most selective control around <br />desirable trees. <br />Proper calibration with a handsprayer / <br />handgun can be done.by : <br />I. Filling the sprayer with water to a <br />marked level. <br />2. Meazure an area 18.Sft x 18.Sft. <br />and uniformly spray it. <br />3. The fluid ounces required to refill <br />the tank to the marked level is the <br />gallons per acre you are applying. <br />_ .For example: Farmer X has <br />spr:tyect the 18.5 x ]A.5 ft. area and <br />measure 100 ounces back into the <br />tank. Xis applying 100 gallons per <br />acre. He wants to apply 1 pint of <br />Tordon 22k per acre. He will add <br />1 pint of Tordon to each 100 <br />gallons of spray mix. <br />Other products are in the development stage <br />at this time. <br />All treatments will require repetition for at <br />least 3 years! <br />IlVTEGRATED WEED <br />MANAGEMENT <br />of <br />SPOTTED & DIFFUSE <br />KNAPWEED <br />for lazge lot owners, <br />farmers, and ranchers. <br />rtoale j <br /> <br />.a/ <br />~,~ <br />(~ • <br />.,.~ (~ <br />DIFFUSE KNgpWCED <br />Douglas Co. Coop. Extension <br />107 Vlltlca~, Suite 200 <br />Castle Rock, CO 80104 <br />688-3096 <br />Jce Julian -Director <br />in collaboration with <br />Douglas Co. Weed Division <br />s lnaustrial way <br />Castle Rock, CO 80104 <br />660-7476 <br />Jonathan Rife -Weed Inspector <br />