Strategies Can Prevent Herbicide-Resistant Weeds UNIVERSITY PARK (Centre Co.) By taking some precau tions, you can keep resistant weeds from sabotaging your her bicide program, according to a Penn State weed scientist. “Weed resistance has been a problem with several classes of herbicides,” said Dr. William Cur ran, assistant professor of weed science in Penn State’s College of Agricultu'al Sciences. “In the northeastern United States, tria zine resistance is by far the most serious of these.” Since the 19605, more than SO species of weeds throughout the world have developed biotypes that are resistant to different herbi cide families. The Northeast has at least four weed species that require additional time or resour ces to manage because they’re triazine-resistant. Herbicide-resistance has been caused by monoculture cropping patterns such as growing continu ous com; using herbicides that persist in soil; using less tillage and thus reducing nonchemical weed-control options; and spread ing resistant weed seeds along with cattle manure. “When choosing an herbicide program, base your decision mainly on anticipated weed prob lems and potential herbicide resis tance,” said Curran. “Also consid er crop and herbicide rotations, potential herbicide injury to crops, your tillage system, your herbi cide application equipment, soil characteristics, potential environ mental hazards and cost.” Crop management strategies you will get higher production with lower cost and less maintenance. C-2 feeder H-2 feeder H-2 feeder for broilers for broilers for turkeys nipples that can help deter herbicide resis tant weeds include: • Use herbicides only when necessary. • Rotate herbicides with diffe rent sites of action in weeds, such as amino acids, enzymes or pro teins. Do not make more than two consecutive applications of herbi cides with the same site of action to the same field unless you include other weed-control prac tices. Two consecutive applica tions means single annual applica tions for two years or two split applications in one year. • Apply herbicides in tank mixed, prepackaged or sequential mixtures that include multiple sites of action. The herbicides must be effective against poten tially resistant weeds for this strategy to work. • Rotate crops, particularly those with different life cycles, such as winter wheat, barley and other winter annuals; alfalfa and other perennials; and com, soy beans and other summer annuals. Do not use herbicides with the same site of action against the same weed in these different crops unless other effective control practices are also included. • When growing new herbicide-resistant crop varieties, do not use more than two consecu tive applications of herbicides with the same site of action against the same weed unless other weed control practices are included. • When feasible, combine her bicide use with mechanical weed control. Insist on Chore-Time bins and FLEX-AUGER® Northeast Agri Systems, Inc. Flyway Business Park STORE HOURS: Mon.-Frl. 7:30 to 4:30 139 A West Airport Road Sat. 8:00 to Noon LititZ, PA 17543 24 Hr. 7 Day Repair Service Office & Counter Closed Friday & Saturday, December 24 & 25 / December 31 & January 1 • Where there is little potential for soil erosion, include primary tillage as a component of your weed management program. • Scout fields regularly and identify the weeds present. Respond quickly to changes in weed populations to restrict the spread of weeds that may have developed resistance. • Clean tillage and harvest equipment before moving it from Table 1. Herbicide modes and sites of action and representative examples within each group. Growth regulators Amino acid synthesis Lipid inhibitors Seedling shoot inhibitors Photosynthesis inhibitors Cell membrane disrupters iment inhibitors * Herbicides with multiple sites of action are less likely to select for herbicide resistant weeds. swine feeding Lancaster Farming, Saturday, Dacambar 28,11 M-AH fields infested with resistant weeds. • Encourage local organizations such as railroads, public utility companies and highway depart ments to use vegetation manage ment systems that do not lead to selection of resistant weeds. If these organizations use total veg etation control (TVC), resistant weeds from TVC areas can spread multiple sites * ALS synthase EPSP synthase Acetyl-CoA carboxylase (ACCase) multiple sites * D-l quinone protein Photosystem I Protoporhyrinogen oxidase rnthesis Carotenoid bi< adult turkey ULTRAFLO* feeder with plastic pan for layers, pullets & breeders cage systems to cropland. For more information on weed control and herbicides, consult the “1993-94 Penn State Agronomy Guide,” available for $6 from the Penn State Cooperative Extension office in your county or from the Publications Distribution Center, 112 Agricultural Administration Building, University Park, PA 16802, (814) 865-6713. Banvel, Crossbow, 2,4-D, MCPA. Stinger Accent, Ally, Beacon, Broads trike. Classic, Express, Harmony Extra, Pinnacle. Pursuit, Scepter Ranger, Rodeo, Roundup, Touchdown Assure 11, Fusilade, Fusion, Hoelon, Option, Poast, Select, Whip Dual, Eptam, Eradicane, Frontier. Lasso. Ramrod. Sutan+ Atrazine, Basagran, Bladex, Buctril, Extrazine, Laddok, Lexone, Linex, Lorox, Princep, Sencor. Sinbar. Spike. Velpar Gramoxone Extra, Diquat Blazer, Cobra, Reflex Command authorized master distributor 1-800-673-2580 Ph: (717) 569-2702 jgg
Significant historical Pennsylvania newspapers