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Chemical controh. The sensible use of the proper herbicides at the optimum time can be the <br />most effective method of control for very persistent weeds. Not alt herbicides are equally <br />effective on all weeds nor can every herbicide be used in every situation. A ifcensed <br />professional should perform application of herbicides. <br />The basal 12-18 inches of the trunks of small plants (usually around 1" in diameter) with smooth bark <br />can be sprayed with herbicide (basal bark treatment). For best results, apply the basal treao~nt when <br />plants are dormant. Potter sprays (herbicide treatment) during the growing season must cover the <br />entire leaf surface to be effective. Tamarisk infestations in close proximity to water or wildlife habitat <br />should be sprayed with an aquatic friendly herbicide that is identified by the tnanufactnrer as bring <br />non-toxic to aquatic and wildlife. This method is most effective on small diameter trees. Sprayed <br />trees must be left standing 3.4 years to allow the herbicide to completely kill the tree. Follow up <br />spraying may be necessary 1-2 years after treatment <br />CONTINUING WEED MANAGEMENT <br />Elam Construction will monitor their gravel pits to identify infestations of tamarisk and <br />Russian olive. Annual surveys will be performed in the spring to identify new growth. The <br />results of these surveys will aid in determining the proper controlling measures. Once <br />control methods have been applied, the frequency of follow-up inspectors wilt vary <br />depending on the control method used. Follow-up inspections at 4-6 week intervals will be <br />conducted to identify areas needing additional treatments for chemical control methods. K <br />mechanical control methods were used (cut stump or root ball removal), follow-up <br />inspections are not required until the foiVowing growing season. Sfte inspections will also be <br />performed during mid to late summer to identify any new tamarisk growth. New growth will <br />usually be treated with herbicides. Again follow-up inspections will occur at 4-6 week <br />intervals. <br />New growth from cut tamarisk will occur from the root crown, which is under the cut stump. <br />New growth from cut Russian alive can occur at the cut stump or along any one of its lateral <br />roots. Therefore, follow-up inspectors, especially for Russian olive, should Include areas <br />beyond the cut stump. <br />This 'Tamarisk/Russian Olive Management Plan was developed in consultation with, and <br />approved by: <br />I ~ lp <br />J ith 5irota Date <br />rticuiture Pest 8 Weed Inspector <br />Vagneur Pit June 07 E-8 <br />