The most effective marestail control program should start with fall treatments, especially in fields with a history of marestail problems or fields that we can see now with adult plants setting seed. A number of different herbicides can be applied in the fall for marestail control ahead of soybeans, such as 2,4-D, dicamba, Clarity, Sharpen, Canopy EX, Autumn Super, or Valor XLT. The addition of glyphosate helps control grasses and other broadleaf weeds, and can even help on glyphosate-resistant marestail.
Herbicide effectiveness on marestail depends largely on the stage of growth and size of the plants. Marestail generally is most susceptible to herbicides when it is small and still in the rosette stage of growth. Once marestail starts to bolt and exceed 4 to 6 inches tall, it becomes very difficult to kill with most herbicides. Since marestail can germinate throughout much of the year, a single herbicide application probably will not provide season-long control, particularly in no-till.
Fall applications can be effective even into December as long as applications are made to actively growing weeds during a stretch of mild temperatures. In fact, for fall applications, it may be better to wait until November to allow most of the fall-germinating winter annuals to emerge. A residual herbicide such as metribuzin-, Valor- or Classic-containing products (unless the marestail is ALS resistant) can be added to help control marestail through winter and early spring. But don’t expect a residual herbicide applied in the fall to provide good residual weed control through the spring and summer of the next year. If a fall treatment isn’t made, early spring treatments in March to early April should be applied to help control fall-germinated marestail.
Which wheat fields are most likely to be infested with Hessian fly in the fall? It depends on residue management, variety, planting date, the presence of nearby volunteer wheat, the use of insecticide seed treatments, and crop rotation. Continue reading “Factors That Influence Hessian Fly Fall Infestations”
The preliminary data shows that August tied for the 7th coolest on record. The statewide average temperature was 72.7 of, which was matched in August of 2004. All divisions were cooler than normal with departures ranging from -3.6 oF in the Northwest to -5.0 oF in the Southeast. The cooler-than-normal temperatures were Continue reading “August Weather Update”
Late summer and fall can be an excellent time to treat unwanted stands of woody plants. Scattered stands of individual trees should either be treated individually using the basal bark method (for labeled plants less than 4-6 inches in diameter) or the cut stump treatment method. The basal bark and cut stump treatments will not be effective if the plants cannot be treated down to the soil line. Avoid conditions where water (or snow later in the season) prevents spraying to the ground line. Continue reading “Control of Woody Plants on Range Land”
I helped with the Harvey County tillage survey this week and saw evidence of insect damage across the county.
Be on the lookout for corn earworms Continue reading “On the Lookout for Corn, Milo and Soybean Insect Damage”
Alfalfa is often considered as the “Queen of Forages” because it produces high yields that are highly digestible and high in protein. Alfalfa is a very important leguminous crop for dairy and other livestock industry in Kansas. Late summer and early fall are often the best times to plant alfalfa in Kansas due to less weed pressure than spring planting. Continue reading “Fall Alfalfa Planting”
Coming into spring is a good time to evaluate and perform maintenance on terraces if fields are in wheat stubble, especially since it has been dry lately this year. In Kansas, over 9 million acres of land is protected by more than 290,000 miles of terraces, making Kansas No. 2 in the U.S. for this soil and water conservation practice. To accomplish their purpose for erosion control and water savings, terraces must have adequate capacity, ridge height and channel width. Continue reading “Terraces Evaluations”