Laserfiche WebLink
ti <br />' 2003). <br />* Pros of Hand Herbicide Application: <br />1. Inexpensive and effective for light infestations. <br />2. For inaccessible and remote areas, hand application using backpack, horses, or off -road <br />vehicles is effective. <br />3. Generally, there is no need to remove dead biomass or to actively revegetation in the light <br />infestations where this approach is typically used. <br />Cons of Hand Herbicide Application: <br />1. Not feasible for large infestations. <br />2. Not possible above 85° F or in freezing temperatures for triclopyr herbicide. <br />3. May require leaving tamarisk standing in an area for a period of years. <br />Applicability: When density of infestations are light, the use of a foliar or basal bark spray can <br />be effective using backpack sprayers, horseback sprayers, or vehicle mounted equipment. Thus, <br />hand herbicide application is appropriate for controlling light tamarisk infestations, especially in <br />areas that are difficult to access such as canyons, washes, irrigation ditches, and steep <br />embankments. This approach is especially appropriate for controlling re- sprouts and other <br />noxious weed control efforts. <br />Hand Cutting with Herbicide application <br />This method is referred to as the "cut- stump" approach in which the tree is cut or scored with <br />chainsaws, handsaws, or axes. Within approximately 15 minutes, a solution of triclopyr <br />systemic herbicide (Garton 4 ® mixed in vegetable crop oil) must be applied to the cut stump. <br />Cut materials are chipped, piled and burned, or piled for wildlife habitat depending on site <br />specific circumstances. This method of tamarisk removal is probably the most widely used <br />method. This approach requires trained sawyers and /or herbicide applicators. <br />Effectiveness: The cut -stump approach successfully controls tamarisk with a regrowth rate of <br />approximately 15 percent. This regrowth will require a second herbicide treatment. Herbicide <br />sprays are effective regardless of the time of year unless the temperature exceeds 85° F, at <br />which point the triclopyr herbicide volatizes and can be potentially harmful to workers and <br />surrounding vegetation. If temperatures are anticipated to be above 85° F other herbicides are <br />required. Freezing conditions may also limit its use. <br />Costs: Hand work is very expensive, ranging from $1,500 per acre in lightly infested areas to <br />$5,000 per acre in heavily infested areas for initial removal (Tamarisk Coalition 2003). To <br />ensure effective control, re- sprouts must be treated with foliar and /or basal bark herbicide <br />applications. <br />Pros of Hand Cutting: <br />1. Hand cutting effectively removes tamarisk in mixed vegetation without damaging other <br />valuable plants. <br />2. Hand cutting is appropriate for rough terrain that is not accessible by mechanical equipment. <br />Cons of Hand Cutting: <br />1. Cut material must be stacked and burned, chipped, or left in piles for wildlife habitat. <br />2. Re- sprouts will require herbicide re- application. <br />Applicability: Hand clearing tamarisk is appropriate for canyons, washes, irrigation ditches, <br />and along steep river banks which have a high level of access difficulty. For moderate levels of <br />access difficulty, hand removal will be appropriate for some areas of a work site, such as steep <br />