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Lethbridge Herald Newspaper Archives

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Lethbridge Herald, The (Newspaper) - September 5, 1972, Lethbridge, Alberta y, 5, 197! THE LETHMIDGE HfPAlD Canada thistle control vital Keep Canada and perennial sow thistles on summerfallow land under control between now and freeze up, warns Lcth- bridge and Warner district ag- riculturist Murray McLelland. "Canada thistle is on the In- crease in southern Alberta and additional emphasis on its con- trol by the farmer is be said. With harvest about to begin, many farmers may neglect summerfallowing at the very lime thistle control is most crucial. It is during the next few weeks that the plants re--' plenish the food reserves is their root systems that will be used to carry them through the winter. Until about the middle of Jviy food is drawn from the roots to produce seed stalks and seed. If the top growth of the this- ties is kept under control for the rest of the growing season, the plants will be unable to build-up these reserves and will go into the winter in a very weakened condition, thereby greatly Increasing the chances of their being winter-killed. Mr. McLelland recommends thoroughly cultivating or spray- Ing Hustle infested lows just before harvesting op- erations. Cultivating at this time of year will keep the this- tles down for at least three weeks, he says; chemical con- trol will delay their growth .even longer. Hoth Canada and perennial sow thistles can be sprayed with or MCPA at the rate of 1 pound active ingredient per acre or with dllcaniha CBanvel Liquid Herhicide) at a rate of 'A to l'ii pounds of active in- gredient per acre. A prepared mixture of dicamba, and Mecoprope (Banvel 3) at a rate of 8 to 16 ounces active ingredi- ent per acre (depending upon plant density and growing con- will also give good thistle control. It is important with any of these herbicides to use a sufficient volume of water to give complete coverage, said Mr. McLelland. lie also suggests piclorarn (Tordon) at a rate of 8 to 16 winces of active ingredient per acre for land with only a few prunes of thistles. Picloram, however, must net be used on a field- scale baste. In Alberta It is reg- Islered only for spot treatment on cultivated !and snd must be by, or L-nder the direc- tion of, a licensed applicator. Some injury to the subsequent crop can be expected on treated ureas. According to Mr. McLelland, at least 90 per cent of the thistles on summerfallow land can be eliminated in one sea- son with intensive cultivation or a combination of cultural and chemical control. In fact, in some instances complete elimi- nation has to be attained. To avoid undoing all the re- sults that have been achieved up to the commencement of harvesting, thistle growth must be kept down during harvest- ing. Cultural operations must SNOW MOULD Snow mould is a group of fungi which live and grow under (mow in tlic winter. When the snow melts, the fungi cease to be active. Snow mould is one of the major diseases of alfalfa, and scientists at the Saskatoon and Lethbridee Research Stations Out., Research Institute it- be started again immediately after harvesting operations have been completed and continued until free7o-up. He reports that studies have shown that only two Canada thistle plants per square yard can reduce wheat yields by as much as six bushels per acre, and that 19 plants per square yard can reduce a potential wheat yield of 32 bushels an acre to about 10 bushels per acre. Tn fact, the average fann- er In the prairie provinces prob- ably loses at least 15 per acre from thistles alone. high FOOD floor low Spring growth starts Frost Top growth Top growth removed Top growth removed Top growth removed allowed to grow JAN JULY SLTI NOV See the New Be sure to see one of our courteous TOYOTA Salesmen Pete Alexander Con Barrett Les Ingle 2 LITRE COROLLA 1600 "CORONA 2000 On Display Now! TRAVEL CENTRE Gayle Johnson 3516 24th AVE. S. Phone 327-3165 Open Dolly Until 9 p.m. LETHBRIDGE ;