-Com Talk, Lancaster Farming, Saturday, January 19,2002 206 Herbicide Varieties Effectively Control Winter Annual Weeds COLUMBUS, Ohio The struggle to effectively manage winter annual weeds may get easier for corn and soybean farmers. Ohio State University weed scientists have identi fied several herbicides that help control common chickweed and purple dead nettle with at least 90 percent effectiveness in no-till corn and soybean fields. Mark Loux, an Ohio State weed specialist, said the pur pose of the research was to provide management options for controlling problematic winter annual weeds. “The activity of glyphosate (more commonly known as Roundup) in the spring before planting has been slow under cool conditions. It just wasn’t killing the weeds fast enough,” said Loux. “Over the past two or three years, the winter annual population has just soared and I suspect it’s due in part to shifts in Lancaster Farming Circulation Main: 717-394-3047 717-721-4412 • 717-721-4411 Monday, Wednesday & Friday 8:00 am to 5:00 pm Thursday 7:00 am to 5:00 pm Fill in \onr name address telephone number ( heck appropriate pa\ment box *S2 issues $34 00 104 issues - sf>3 00 in PA MD DF N| NY;OH,VA, WV * All other stales 12 issues - S4S 00 Outside U S - Call lor price quote Payment must accompany order - Allow three weeks for subscription to start Cut your mail label from a recent issue and place in the space provided below Write your new address and telephone number on the form below In addition, provide a requested date for address change to take effect Send "i to 4 weeks prior to your requested date I ancasler running wil! send a renewal notice to you prior to the expiration date ol vour subscription \ou may renew your subscription using the lorm below To insure proper credit tor your subscription - Attach Yo trom a recent Lancaster Farming issue and check the appropriate payment boxes Renewal - Change of Address Attach Your Mail Label Here Please send this form & payment to: Lancaster Farming PO Box 609 Ephrata, PA 17522 (Check appropriate Boxes) Rates Effective Through 04/30/00 □ New Subscription U Renewal - Attach Mailing Label Above U Address Change - Attached Mailing Label Above Date to Change / / PA. MD. DE. NJ. NY. OH. VA. WV ij $34.00 - 1 yr (52 issues) LI $63.00 - 2 yrs (104 issues) Address Address U I have enclosed a Check/Money Order LI AmEx □ Please charge my credit card □MC L) Visa U Discover ill ii i i i~r i i 111 ii i rrxn Signature (or Credit Card Payment Only NON REFUNDABLE herbicide use. The issue here is how can we better manage these weeds?” Common chickweed and purple deadnettle, which pri marily emerge in late summer or fall, tend to cause headaches for farmers. They prevent the soil from drying out and warming up in the spring; they interfere with til lage because they grow so thick they snag equipment: and they harbor insects or serve as insect hosts. Re search has shown that purple deadnettle may serve as an alternative host of soybean cyst nematode, a pathogen that damages soybeans by feeding on plant roots, rob bing the plants of nutrients, and providing wound sites for root-rotting fungi to enter. Researchers found that fall treatments provided more consistent control than spring applications. Among soybean herbicides studied, IPTI F ADDRESS HAN WALS REN CLIP HERE incaster Farming Mail Label All Other SI U $45.00 - 1 yr (52 issues) Li $85.00 - 2 yrs (104 issues) Telephone (credit card number) 104 issues SBS 00 ir Viiilinp I al State exp date for example, only three pro vided 80 percent control of weeds when applied in March, but 10 provided 90 percent control when applied in November. Researchers analyzed herbicides with at least 20 different active ingredients. Loux theorizes that smaller plant size and warmer soils in the fall may attribute to more effective fall herbicide appli cations. “I think the plants are smaller in the fall. Their growth rate hasn’t geared up yet in early spring. Plus colder weather in the spring may prevent the rapid herbi cide activity and plant death needed so a farmer can plant his field,” said Loux. “The issue here is crop establish ment. If a farmer is having Hooter has Case-DMI Rip Strip Tillage Machines in stock and ready for immediate delivery. Call a Hooter salesman today! INTERCOURSE, PA Hj 800 732-6017 IHIIIHiD | MIDDLETOWN. DE 800 341-4028 McALISTERVILLE, PA 800 433-6679 difficulty in getting his crop established in the spring due to winter annual weeds, then he may need to consider a fall application. “We are not saying that fall herbicide applications are always better than spring ap plications. Both can be effec tive,” said Loux. “But it just may be a better strategy for the same money to use a fall herbicide that has good resid ual that can carry through spring.” Loux said by applying her bicides in the fall, even under cool conditions, gives a farmer a better chance of es tablishing his field for plant ing. “If a farmer is planting in April and applies the her bicide in March, that only gives him few weeks to get wm a* * u % *y^* : that weed out of his field before planting,” said Loux. “That's really not that much time.” Farmers are recommended to apply fall herbicides now through mid-November. Re search has found that herbi cides perform well even when applied under cold condi tions, so applying herbicides through early December may also be an option. Researchers also studied the effectiveness of the herbi cides on marestail and dan delion with positive results. For more information on the project or for a list of ef fective herbicides, log onto Ohio State Extension’s C.O.R.N. newsletter at http:// corn.osu.edu/archive/ index.html and select issue 01-35. The New Case-DMI Rip Strip Tillage Machine gives better seed-to-soil contact and heats up the ground quicker for earlier planting, plus it delivers more uniform crop germination. This 6 row Chisel Plow comes with folding markers and is backed by Hoober's outstanding parts and service departments For a Com plat* List of Hoobar Inventory, Visit Our Web Sits. x/i .-S' •V-- ' ' lA % * ' ' ’ ”, K. ", ve been je machines and the DMI is lage machine ;avy piece of 's well the DMI no-til can get I was machine ” Rob Kauffman larch Provider ic Independent Tech Service Ml Joy, PA
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