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2 <br />Tamarisk and Russian Olives: <br />Mechanical Control: Mechanical removal is the use of heavy equipment to physically <br />remove the plant. This is accomplished in one of two ways -root crown removal or <br />mulching. Brush hogging, and burning lead to less successful control due to the vigorous <br />regrowth that occurs. However, cutting combined with herbicide treatment can be very <br />effective at controlling tamazisk. <br />Cutting down the shrub or tree and painting the stump surface immediately afterwazd <br />with an herbicide (cut stump treatment such as Gazlon 4, or equal) is the most effective <br />control method. This herbicide must be applied per manufacturers recommendations, but <br />most require application within 10-15 minutes of cutting to prevent excessive resprouting <br />from the stump. All branches and trunk pieces must be removed from the site to prevent <br />sprouting. Mulching of the branches and trunks is an acceptable alternative to removal. <br />The cut stump method is best done in the fall or winter after the tamazisk leaves have <br />fallen. Rough barked plants should receive the cut stump treatment. Follow up treatment <br />of spouts will be necessary for 2 - 4 yeazs to be successful. <br />Biological Control: Biological control is the use of specific organisms to control an <br />undesirable organism. For tamazisk, two-bio-control agents have been identified -goats <br />and a Chinese leaf beetle. Goats will feed on tamarisk shrubs if fencing is provided to <br />limit other food sources. The Chinese leaf beetle will be released by the USDA in the <br />future, but is not available to the general public at this time. <br />Chemical control: The sensible use of the proper herbicides at the optimum time an be <br />the most effective method ofcontrol for very persistent weeds. Not all herbicides aze <br />equally effective on all weeds nor can every herbicide lac used in every situation. A <br />licensed professional should perform application of her~ncides. <br />The basal 12-18 inches ofthe trunks ofsmall plants (usually around 1" in diameter) with <br />smooth bark can be sprayed with herbicide (basal bazk treatment). For best results, apply <br />the basal treatment when plants do not have leaves. Foliaz sprays (herbicide treatment) <br />during the growing season must cover the entire leaf surface to be effective. Tamazisk <br />infestations inclose proximity to water or wildlife habitat should be sprayed with an <br />aquatic friendly herbicide that is identified by the manufacturer as being non-toxic to <br />aquatic and wildlife. This method is most effective on small diameter trees. Sprayed trees <br />must be leR standing 3-4 years to allow the herbicide to completely kill the tree. Follow <br />up spraying may be necessary 1-2 years after treatment. <br />CONTINUING WEED MANAGEMENT <br />GJ Pipe will monitor their gravel pits to identify infestations ofnoxious weeds on an <br />annual basis at a minimum. The results of these surveys will aid in determining the <br />