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Management of Tamarisk
Tamarisk is difficult to control due to the extensive, deep root system and abundant seed production. A new plant can grow from tiny root fragments and seeds can germinate within 24 hours of contact with saturated soil or water. The best management strategy is to integrate chemical and cultural or mechanical control.
Mechanical Control
Research has shown that many mechanical control methods, when used on their own, have no effect on tamarisk due to vigorous crown regrowth (shooting from the base of the tree). These methods include burning, shredding, roller chopping, and chaining (Beck, 2005). Repeated root plowing with a horizontal blade at least 20 inches below the soil surface, coupled with revegetation, has proven effective. However, this is VERY expensive and not realistic for smaller infestations. Flooding is only effective if the plant is totally submerged for at least 24 months. Seasonal inundation does not control saltcedar. Cutting trees at the base and immediately applying herbicide to the cut stump is effective.
Chemical Control
In general, effective chemical control requires multiple applications. Timing and application rate are crucial for successful control. Again, application rate is critical; MORE DOES NOT NECESSARILY MEAN BETTER CONTROL. Always read the label when applying an herbicide. If you have any confusion about mixing rates please call our office and we will assist you.
Herbicides containing triclopyr (e.g. Garlon 3A and 4), imazapyr (e.g. Habitat, Arsenal ), or imazapyr mixed with glyphosate (e.g. Roundup) effectively control tamarisk. Triclopyr should be applied at a 1.5% solution in 300 gallons water per acre in May or August. Imazapyr can be applied at a 1% solution sprayed to wet but not dripping in August or September. Imazapyr plus glyphosate can be applied at a 0.5%+ 0.5% solution anytime during the growing season. Mixing these chemicals is less expensive than imazapyr alone. These herbicides can be purchased at an agricultural products supplier (please check the yellow pages for specific stores). Again, cut stump treatments can be very effective on larger plants.
Biological Control
The saltcedar leaf beetle (Diorhabda elongate) was released at three Colorado sites in August, 2005. It will be approved by the Colorado Department of Agriculture for wide-scale release in 2007. Both the adults and larvae feed on tamarisk foliage and appear to be a promising alternative for large infestations.
Cultural Control
Revegetation is a vital component of tamarisk management. Planting native perennial species after tamarisk removal will help keep the area free of other noxious species that tend to fill the niche left by tamarisk removal projects.
Grazing is not an option for tamarisk.