Fall rain and cooler temperatures provide good conditions for extending the herbicide application season. The following species and many others can be effectively controlled in the fall. Follow the links for control recommendations for each species.Read More
Practical guidelines for cleaning and winterizing your truck-mounted, ATV, or backpack sprayers.
Proper cleaning and winterization of herbicide application equipment is important to ensure safe storage over the winter. Spending a little extra time in the fall will save you time and money next spray season!
2010. Proceedings Western Society of Weed Science. V63: p44.
Ruth Richards*, Big Horn County Weed and Pest Control District, Greybull, WY; Mary B. Halstvedt, Dow AgroSciences, Billings, MT and Tom D. Whitson, University of Wyoming, Professor Emeritus.
Big Horn County is located in north central Wyoming. Russian olive, Elaeagnus angustifolia, was listed as a state noxious weed in 2007. Russian olive removal projects were initiated across the state. A standard treatment program involves the mechanical removal of all above ground growth followed by a foliar treatment to regrowth. Standard herbicide recommendations for treating the regrowth proved to be inadequate. The objective of this project was to identify an effective herbicide, rate and timing. Russian olive trees were mechanically removed in February 2008 using a mulcher mounted on a skid steer. Plots were set up as a randomized complete block with three repetitions. Treatments included two timings: 5 months (July 2008) after removal when regrowth was 2-4 feet tall and 8 months (October 2008) after removal to regrowth from 3-8 feet. Early timing treatments were triclopyr ester alone at 2, 3, and 4 lb ae/A (2, 3, and 4 qts/A Remedy® Ultra/Garlon® 4 Ultra), triclopyr ester plus aminopyralid (Milestone®) at 2+ 0.11 lb ae/A (2 qt + 7 fl oz/A). Later timing treatments were triclopyr ester alone at 2 and 3 lb ae/A, triclopyr ester plus 2,4-D at 1 +1 lb ae/A, triclopyr ester plus aminopyralid at 2+0.11 lb ae/A, aminopyralid+metsulfuron at 0.11+.02 lb ae/A (Chaparral® at 3.3 oz/A), and triclopyr amine at 3 lb ae/A (Garlon® 3A at 4 qts/A) plus aminopyralid at 0.11 lb ae/A. All treatments included 1 qt of MSO/A. Plots were visually evaluated for percent control 1 YAT in October 2009. None of the early treatment plots yielded acceptable levels of control. In the later application timings, triclopyr ester at 2 lb ae/A plus aminopyralid at 0.11 lb ae/A yielded the highest control at 97%. Triclopyr ester at 3 and 4 lb ae/A both showed 93% control. Triclopyr ester at 2 lb ae/A provided only 66% control. The treatment that provided the lowest level of control at 47% was the triclopyr ester tank mixed with aminopyralid+metsulfuron at 1 lb+.11+.02 lb ae/A. Applications in July will not provide effective control of Russian olive regrowth. Treatments applied in October when there was more regrowth were significantly more effective. Adding 0.11 lb ae/A (7 fl oz/A) of aminopyralid to 2 lb ae/A (2 qt/A) triclopyr ester improved Russian olive control to 95% from 66% when triclopyr ester was applied at 2 lb ae/A alone.
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The USDA Plants database lists more than 20 Rubus species (and associated hybrids) that were introduced to North America. Himalayan blackberry (Rubus armeniacus) and cutleaf blackberry (Rubus laciniatus) are the two most widespread of the invasive blackberry species.Read More
Fall is an excellent time to control invasive weeds with Milestone. Late summer and fall rains in many areas of the Central Plains and the West will provide land managers with a good opportunity to extend their application season.Read More
Undesirable or invasive woody vegetation threatens the biology and ecology of prairie grasslands and native woodlands. Removing invading woody species can be accomplished year-long, with fall, winter and early spring herbicide applications, extending your vegetation management efforts.
Plants in the carrot (Apiaceae) family share the characteristic of an umbel-shaped flower head. The family includes hundreds of plants, some that are valuable vegetables and herbs, and a few that are masters in chemical warfare. Accurate identification is important for management and avoiding accidental poisoning. This article reviews distribution, identification and management of three invasive, toxic plants in the carrot family: poison hemlock (Conium maculatum), wild parsnip (Pastinaca sativa), and giant hogweed (Heracleum mantegazzianum).Read More
The carrot (Apiaceae) family comprises 434 genera and about 3,700 species and is characterized by a flat-topped flower cluster, called an umbel. Water hemlock (Cicuta), one of several toxic members of this family, is considered to be the most toxic plant in North America. There are four species of water hemlock in North America, all highly poisonous and native to North America: spotted (C. maculata), western (C. douglasii), bulblet-bearing (C. bulbifera), and Mackenzie’s (C. virosa).Read More
Managing incompatible woody vegetation along utility and transportation rights-of-way (ROW) requires careful planning, consistent budgets, and judicious allocation of time and resources. When budgets or resources are inadequate, planned vegetation maintenance may be postponed to the following growing season or beyond. While delaying maintenance for even one year allows woody vegetation to increase in density and height, the actual increase in time and material to control the vegetation after one or more years of delayed treatment has not been determined.Read More
Spotted knapweed (Centaurea stoebe) is a tap-rooted perennial forb that spreads by seed. Seedlings and mature plants over-winter in a rosette stage and resume growth in early April. Spotted knapweed blooms from mid to late July through mid September.Read More
Yellow (Melilotus officinalis) and white (M. alba) sweetclover are herbaceous, non-native legumes that are widely distributed in the United States. Learn about the biology, ecology, and management recommendations for sweetclover.
Photo by Elizabeth Bella, USDA Forest Service, Bugwood.orgRead More
Several biennial thistles are problematic in North America including bull thistle (Cirsium vulgare), musk thistle (Carduus nutans), plumeless thistle (Carduus acanthoides), and Scotch thistle (Onopordum acanthium).Read More
Common (European) buckthorn (Rhamnus cathartica) and glossy buckthorn (Frangula alnus[Rhamnus frangula]) are non-native, deciduous, woody shrubs or small trees introduced to North America during the 1800s as ornamentals, hedgerow plantings, shelterbelts, and wildlife habitat. They escaped cultivation and have aggressively invaded natural areas and forestland throughout much of the United States and Canada (Figure 1). Non-native buckthorn spreads through intentional plantings and through wildlife seed distribution, especially from birds.Read More
Distinguishing between non-native and native buckthorn is important so that management efforts can be targeted appropriately. The following description separates the two invasive buckthorns from the native alderleaf buckthorn.Read More
Tall buttercup is an introduced perennial forb that is widespread throughout much of North America. It is invasive on irrigated and sub-irrigated pastures, meadows, stream banks, roadsides, and ditches. Integrating various management techniques—prevention along with herbicides, mechanical, manual, biological, and cultural methods—will optimize control of tall buttercup.Read More
Choosing the right herbicide to fit your vegetation management objectives is an important decision. Herbicides are classified in a number of ways based on how they are used and their selectivity on different plant families.Read More