Rotate herbicides to help control triazine resistant weeds CHICAGO A farmer applies atrazine preemergence, comes back with an early atrazine and crop oil treatment, and still has pigweed come through in his corn. Chances are very good that he’s dealing with a weed which has developed a resistance to triazine herbicides. More than 15 weeds have been identified by weed scientists across the country as having developed resistance to triazines, according to Ron Ritter, University of Maryland Extension weed control specialist. The triazine family includes atrazine, Princep (simazine), Bladex (cyanazine), and the assymetrical triazines Sencor and Lexone (metribusin). When a weed develops resistance to one of these compounds, it’s apparently resistant to all of the triazines, Ritter says. Ritter points out that problems so far are not considered widespread. Pigweed and lamb squarters are the two weeds most often mvolved so far in the Nor theast, he says, and work in 1983 suggests that velvetleaf may also be developing resistance. Washington state nurserymen were the first to suspect that weeds were gaining resistance to triazines, Ritter says. Nurserymen were continually using Princep for controlling weeds in their conifer plantations, and eventually, the broadleaf weed groundsel was not being controlled by the herbicide. o** the FARM BUILDINGS Designed for your needs... to your specifications” • Pole Barns • Poultry Houses • Dairy Barns • Horse Stables • Riding Arenas • Utility Buildings • Hog Houses • Cold Storage • Equipment Sheds • Storage Buildings • Work Shops • Residences To help you plan your building and write your own specifications, a professional Snavely field representative is ready and willing to assist you. For over 100 years Snavely has satisfied thousands of area farmers. Snavely’s factory fabricated panels, walls, trusses, etc. not only make erection easier and faster but also save you considerable money. For a no-charge, no-obligation consultation on your building requirements, phone, visit, or mail the coupon below. | /150 Main Street, Landisville NfIPIVPIV / 71 7/898-2241 W W j 351 West James Street, Lancaster & Sons, Inc. Jf / 717/394-7277 J.C. Snavely & Sons, Inc 150 Mam Street, Landisville, PA 17538 I am interested in I plan on building about Name Address City State Phone Number / It was in the mid to latter 1970’s that pockets of triazine resistant weeds became recognized in the Northeast, Ritter says. Several factors are involved in their development and spread. “We’ve found that resistance develops primarily in no-till areas where growers are not using crop rotations and are continually using triazine herbicides,” Ritter says. “The growers often are not con trolling their escapes with cultivation or postemergence herbicides.” Ritter says the farms are usually dairy operations where com is continually grown and manure is spread on the land. Resistant weeds often first appear in end rows and along the edges of a field, the specialist says, and from there are spread to other areas of the field and the farm by harvest equipment and through spreading manure. “It’s difficult to verify the existence of triazine resistant weeds on your farm,” Ritter says. “However, if the triazine her bicides are giving poor weed control you should be aware that the potential exists.” Ritter feels that the triazine resistance situation demonstrates the need for rotating both crops and herbicides. Herbicides from the same chemical family should not be used year after year, and escape weeds should be controlled with cultiviation and/or PLACE (Type of building) County In end rows (Date) postemergence herbicides, How to handle Once there is a problem with a resistant weed, however, it can be handled. Ritter says both Banvel herbicide and 2,4-D will control pigweed or lambsquarters and are usually the most costeffective. “Our success in handling these problems has been to come back with Banvel,” Ritter says. “Farmers are looking for an economical herbicide program, particularly this year, and one option is to use an inexpensive ST. LOUIS, Mo. Soybean oil continues to be a good and legal choice for use as a pesticide ad juvant, according to Larry Beauregard, Associate Director of Soy Oil Programs for the American Soybean Association. “A recent ruling by the En vironment Protection Agency (EPA) which restricts the use of non-labeled materials as pesticide diluents has caused some con fusion,” says Beauregard. “But this ruling doesn’t apply to vegetable oils used as crop ad juvants.” He explains that adjuvants and diluents are not used the same way in pesticides “An adjuvant, often referred to as a crop oil concentrate, is a Annual Easter Choir Program with live Tableaux Scenes presented by the Choirs of the Midway Church of the Brethren 13 Evergreen Road, Lebanon SUNDAY, APRIL 22 7:30 P.M. ALL ARE WELCOME KNOW YOUR ENEMY AND SAVE YOUR TREES FROM THE GYPSY MOTH SERVING FARMERS NEEDS THROUGHOUT PENNSYLVANIA FOR THE PAST 8 YEARS WE ARE NOW TOP DRESSING WHEAT Covering The State Of Pennsylvania ED & DICK’S AIR SERVICE RO3, Benton, Pa. 17814 717-784-5027 triazine preemergence and then follow with Banvel.” Banvet is labeled at a full pint per acre rale as an overlay to a grass herbicide when com is from spike to five inches tall. Or it can be used at 1/2 pint per acre after com exceeds five inches in height. Triazine resistance is genetically passed on from resistant plants through seed, Ritter says. While the resistance concept has been proven in the triazines, Ritter finds it interesting that genetic resistance is not Soybean oil is crop adjuvant material added to a pesticide mixture to improve the pesticide’s performance. It modifies characteristics such as spreadability or droplet size. “A diluent, often referred to as a carrier, is a material used to dilute a concentrated pesticide to field use strength.” The EPA policy ruled that diluents must be labeled for a specific pesticide to be used legally. If a pesticide does not specify a diluent, water must be used. The policy clearly states that ATTENTION Now Call Toll Free 1-800-692-6249 Save This Number For Future Reference. START NOW! Help Control The Gypsy Moth By Planning Ahead And Call For More Information, Prices & Appointments FOR AERIAL SPRAYING IN MAY & JUNE Richard Karschner, Owner Based at The Bloomsburg Municipal Airport 1-800-692-6249 More farmers each month prefer to buy their • EAR CORN • HAY • STRAW • PEANUT HULLS from us for better value and all around satisfaction. At farm or delivered, any quantity as your requirements may be. Area Code 717-687-7631 ESBENSHADE TURKEY FARM showing up with some other her bicide groups. “The oldest herbicide on the market which has been so widely used is 2,4-D,” he says, “but we see little evidence of resistance problems with it.” However, scientists are also now working on problems with some herbicide groups being broken down rapidly in the soil by microbial action. Herbicide rotation - not using compounds from the same chemical family year after year - may be the best prevention at the present time. v the ruling does not apply to ad ditives, adjuvants or surfactants. Beauregard says that if fanners understand the policy’s restric tions, there should be only limited effect on soybean oil’s use as a crop spray, since most farmers use soybean oil as a crop oil or ad juvant. Beauregard predicts that in response to the EPA ruling, manufacturers of pesticides for ULV applications will apply for labeling to legally clear soybeans oil’s use as a diluent. “America’s Oldest" PARADISE, PA OW AVAILABLE: ING AND FALL CHRISTMAS REE SPRAYING WE SPRAY ALL VARIETIES OF CROPS! Any Size -- From House To Thousands of Acres
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