Laserfiche WebLink
<br />ANNUALS & BIENNIALS <br />Target: prevent seed productiou <br />• <br />1) Hand grubbing (pulling), hoeing, tillage, cultivation in rosette stage and before flowering or seed <br />maturity <br />2) Chop roots below soil level <br />3) Herbicide treatment in rosette or bolting stage, belbre flowering <br />4) Mow biennials after bolting stage and before seed set; mowing annuals mzy not prevent the plants <br />from flowering <br />PERENNIALS <br />Target: deplete nutrient reserves iu root system, prevent seed productiou <br />1) Allow plants to expend as much energy from root system as possible; do riot heat when first emerging <br />in spring but allow to grow to bud bloom stage <br />2) Herbicide treatment at bud to bloom stage or in the fall. In the fall plants draw nutrients into the roots <br />for winter storage. Herbicides will be drawn down to the roots more efficiently at this time. If the weed <br />patch has been there a long time, another season of seed production is not as important as getting the <br />herbicide into the root system. Spraying in the fall will kill the following yea-'s shoots, which are being <br />formed at this time. <br />3) Mowing usually is not recommended because the plants will flower anyway; seed production may be <br />reduced, however. Many studies have shown that mowing perennials and spraying the regrowth is not as <br />effective as spraying without mowing. Effect of mowing is species dependerR so know what weed you <br />are working with and consult the experts. <br />4) Tillage may or may not be effective. Most perennial roots can sprout from pieces only %z" - I"long. <br />Clean machinery thoroughly before leaving the weed patch. <br />5) Hand pulling is generally not recommended for perennial species unless you know the plants are <br />seedlings and not established plants. Hand pulling can be effective on small patches but is very labor <br />intensive because it must be done repeatedly. <br />