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Lethbridge Herald Newspaper Archives

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The Lethbridge Herald (Newspaper) - January 22, 1974, Lethbridge, Alberta Tueeday, January 22, 1974 THE LETHBRIOQE HERALD-13 Research Station report Prescription for aquatic plant control An overabundance of aquatic plants causes many serious problems in Complete removal of the plants is equally un- desirable because it dis- lakes and other water rupts the entire aquatic en- IjfeAwla VA systems. vironment and leads to Don't Be Disappointed in 1974 Order Your Baby Chicks NOW! Broiler Built Shaver 288 Sex-Sal-Link and Nicholas White Write tefcj Hr priM IW Md SWIFT CANADIAN CO. LIMITED HATCHERY DEFT. 224 12th Street N. LETHBRIDGE, ALBERTA increased turbidity and nutrient enrichment of the water. At the Lethbridge Research Station, we have shown that aquatic plants can be controlled effective- ly and safely. We are now investigating methods for selective removal of tall aquatic plants, which are the most bothersome, while leaving the low-growing sub- mergent vegetation. This practice should remove nutrients, leave a covering to stabilize the lake bed, and provide Greenhouse ____ -v. fly control A minute wasp, imported from England, is gaining attention as another form of biological pest control. The parasitic wasp f'fSSSi problem where vegetables and ornamentals are grown. The parasites are available commercially in Ontario, but Agriculture Canada scientists caution that it takes time for the wasps to ed and catch up to the whitefly population. feeding sites for various animals. For example, Chara which only grows about eight inches high, forms ex- cellent cover for small aquatic animals such as freshwater shrimps and daphnia that provide food for fish. Pure stands of Chara have developed at Henderson Lake following injection of a mixture of the herbicides diquat and paraquat underwater to give a concentration of 1.5 parts per million in the water. This dosage will kill all vascular plants except Chara. After 72 hours, however, all traces of the herbicides disappear and the water can be used safe- ly for irrigation. PURE STANDS At dosages of 0.5 to 0.75 parts per million, treat- ment with the herbicide mixture will result in pure stands of Richardson pondweed. Dosages in this "ill all other native pondweeds as well as other rooted submergent aquatics. Because of the abundance of tubers and seeds, stands of Richardson pondweed provide excellent feeding grounds for ducks. Repeated treatment with dosages up to '1.0 part per million between mid-May and June will produce beds .of water milfoil. Milfoil starts growth slowly in the spring and becomes es- tablished after the other species have been killed. These are examples of selective or prescription control' of certain sub- mergent aquatic plants. More research is needed to refine our program and to extend it to the emergent aquatic plants. Aquatic vegetation control is a new field and there is still a lot of work ahead. Initial progress has been promis- ing and should lead to other selective control measures in the next few years. GOOD SERVICE Is AUTOMATIC" AUTOMATIC TRANSMISSION 'LTD. 1SZO M UN. S. Guaranteed Servicing Rebuilding and Exchange LIVESTOCK DIVISION Highway No. 3 LETHBRIDGE PUBLIC STOCKYARDS SUPPORT YOUR CO-OP Your consignment properly sorted and merchan- dised consistently brings more'through buyer competition proved by your Co-op. SPECIAL CALF SALES EVERY FRIDAY, 1 P.M. FATS and FEEDERS WED. and FRIDAY 10 a.m. LICENSED, BONDED and CERTIFIED at your LETHBRIDGE PUBLIC AUCTION MARKET FEEDER HOG SALES MONDAY 1 p.m. WE ASSEMBLE MARKET HOGS WE WILL FILL YOUR FEEDER CATTLE ORDERS TO YOUR SATISFACTION PLACE YOUR ORDERS WITH USI Call a Professional Market Man! Consign all your Livestock to your Co-Op CALL CO-OP PHONE 327-4010 VORWERK electro Perfect Universal Room Cleaner for every-day make-up and thorough cleaning CLEANS ANYTHING Hardwood floors, tiles, shags, indoor-outdoor carpet- Ing, throw rugs, deep carpets, Venetian blinds, register, furniture, auto upholstery and much more. Wouldn't you like to have your rugs and floors cleaner with less work. You will receive off suggested retail price with this coupon and your old vacuum. Great tor Getting Dirt Out of Corners on Stairways Cleans Venetian Blinds and Radiator Ribs Easily 3 Year Guarantee 6 Vacuum Cleaners in One A BROOM FOR RUGS A TWO MOTOR UP-RIGHT FOR CARPETS A SHORT HANDLED STAIR VACUUM A WAND TYPE SUCTION VAC A SMALL PORTABLE HAND CLEANER THOROUGH AND GENTLE CLEANING OPTIMAL CONVENIENCE OF HANDLING WITH EVERY JOB ALWAYS READY FOR USE FAST AND RELIABLE ASSEMBLY HIGH SUCTION POWER rates with the finest FAIRFIELD APPLIANCE SERVICES LTD. 1244 3rd S. Phone) 327-6070 ;