WILMINGTON. Del. Com growers can use a postemcrgcnce herbicide to control grass weeds such as foxtail, woolly cupgrass, and wild proso millet up to four weeks after emergence without significant yield loss. Although yield losses generally increase with weed density and duration of competition, com may tolerate a few early weeds for a period of time without significant yield loss, said Ellery Knake, Uni versity of Illinois extension weed scientist. In addition, weeds ger minating three weeks or more after the com was planted resulted in negligible yield reductions. “Our research has shown that you can let foxtail grow with com for three to four weeks. If you have a good selective post emergence herbicide that will con trol the foxtail, you probably suf fer very little, if any yield loss,” Knake said. Other land grant university competition studies with com and some other grass weeds includ- NIPPLEMANIA? YES, NIPPLEMANIA IS RUNNING WILD! DID THE EXCITEMENT OF NIPPLEMANIA HIT YOUR FARM YET OR ARE YOU STILL SCRUBBING AWAY ON YOUR OLD WATERERS? BUY THE VAL NIPPLE WATERING SYSTEM FROM HERSHEY EQUIPMENT CO. INSTALL NIPPLES IN YOUR POULTRY HOUSE TO REDUCE YOUR LABOR COSTS AND IMPROVE YOUR PERFORMANCE AT THE SAME TIME I «IU- »* Post Program Is Flexible With Corn Growers ing johnsongrass, shattercane and quackgrass have resulted in similar findings. In the three-year Illinois study, giant foxtail was removed from com at various time intervals. Results showed that foxtail did not significantly lower yields until it grew to between six and nine inches tall. When removed at three inches, the foxtail reduced com yields less than one percent; at six inches, the plots showed less than a two per cent yield decrease. Knake said that allowing grasses to grow until an early postemergence herbicide application should not result in significant yield loss. Application flexibility and con trol of foxtail in test plots are rea sons why weed scientists antici pate a greater reliance by farmers on new sulfonylurea post emergence herbicides. Du Pont “Accent,” registered in June 1990, is a significant breakthrough with proven capability to control a broad spectrum of grassy weeds. WE HAVE THE CURE! TUT I HERSHEY EQUIPMENT I | COMPANY » INC ' <Ll> c_i Duignrn tf QvalHy Syttms for Pnltiy, Swhu Mi Grain Hinflini □VAL SYSTEMS 6 CALL TODAY! Knake said. “Being effective and quite selective, ‘Accent’ can help fill one of the last parts of the weed control puzzle good post emergence control of grass weeds in com,” Knake said. University of Illinois research ers also studied the effect of fox tail that started growing at various times during the season. The main problem is with foxtail that begins growing the same time as the crop, once com has a head start, it has the competitive advantage, Knake said. Foxtail that started growing several weeks after the com didn’t make much growth. “This is especially true with the high plant populations and narrow rows used by farmers today,” Knake said. “If you let foxtail grow a few weeks and then kill it with a good postemergence herbi cide, you’ll probably not have to worry much about later foxtail making enough growth to affect yields.” Growers should strive for SYCAMORE IND. PARK 255 PLANE TREE DRIVE LANCASTER. PA 17603 (717)393-5807 Lancaster Farming, Saturday, January 5,1991-E27 season-long control, however, because weeds that emerge late in When removed at three-inch heights, foxtail reduced corn yields by less than one percent, according to a Univer sity of Illinois study. Route 30 West at the Centerville Exit. the season could produce some seed for future years, Knake said. SEARCHING FORA GOOD BUY? YOU'LL FIND IT IN CLASSIFIED: 1.800-245-6902 See Us At Farm Show - Main Bldg. #499 Kencove Fence is • Strong • Lasting • Economical
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