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Lethbridge Herald Newspaper Archives

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Lethbridge Herald, The (Newspaper) - May 30, 1972, Lethbridge, Alberta Moy 30, 1972 THE LETHBfllDGE HERALD 19 New replacements for DDT may not fill need B.v Dr. W. 0. IIAL'FE Tollbridge Research Station Until recently, livestock pest control has relied on the use ot a few inexpensive insecticides such as DDT and toxaphenc. Restrictions in the use of these compounds have been accepted with the premise that newer compounds with equal or better efficacy would be available as acceptable replacements. Experience with the newer compounds is beginning to in- dicate that they may not pro- vide the desired results. In many cases the residue prob- lem has been traded for other problems such as increased tox- Icity, side reactions, and var- ious interactions -with growth processes and reproduction. The replacement compounds, on closer scrutiny, have severe limitations under which they can be used. Their effect on reproductive processes in ani- mals, for example, may cause problems in a cow herd if some of the compounds are used dur- ing conception, pregnancy, par- turition, or the immediate post- natal period. Some compounds may slow growth processes and thus may be uneconomic for use on cer- tain classes of immature ani- mals, especially when frequent applications are required and the time to reach market weight is a critical factor in Hie effi- ciency of the management pro- cedure. The performance of some newer compounds has been evaluated on cattlet at the Lcth- bridge Research Station to dis- cover suitable replacements for DDT. Many have been found to be highly effective against the par- asites but are uneconomical. Most are more expensive than the older ones. Some temporar- ily decrease the rate of gain so that a longer feeding per- iod is required to produce the finished weight. Although treatment with DDT may leave objectionable resi- dues, it had the advantage of providing parasite control on animals with relatively little ef- fect on weight gains. There- fore, j-eplacement pesticides with equal or better efficacy against parasites are compared with DDT as a baseline for economically acceptable per- formance. Several organophosphor- us compounds have failed to meet the requirements for fly control in this respect. Metli- oxychlor, an organochlorine compound, however, has com- pared favorably with DDT both in performance of cattle on pas- ture and in effective control of flies. Since it also degrades more rapidly than DDT, it should become the pesticide of choice in multiple treatments to control biting flies and other annoying pests on grazing cattle in summer. NOW ON DISPLAY AT T-n-T EQUIPMENT LTD. 4726 1st Street, Cioresholm THE NEW MF 124 BALER! This new Massey-Ferguson 124 baler gives you tighter, better-looking bales with stronger knots plus more capo- city 1o get your baling done like clockwork. Exclusive Suretle knotter is the mast reliable on the market with 30% fewer parts. Takes all plastic or sisal twine no need for adjustments. The MF 724 is an eager eater. 56" pickup handles heaviest windrows. Whopping big 293 square inch throat opening among ihe biggest in the industry. This is one 14" x 18" baler that can give many 16" x 18" models a run for their And like oil Massey balers, the MF 124 con make bales without a single stop for greasing. For baling at its best, see the new MF 124 Baler right now! Wire tie MF 126 also available. Come on overt Soy "Tennessee Ernie" sent you for a look-seel Phone DON GREEN 235-3623 or 235-3193 In ClARESHOLM EQUIPMENT LTD. SIMPSONS-SEARS DELUXE HARDTOP CAMPER Make Simpsons-Sears Your headquarters For all your Camping Accessories Beautiful hardtop camper sleeps six people comfortably with the beds converting to comfortable seats. It has full zippered ice chest and dome light. The table can be used inside or out. Also has two full size covered mattresses. Heavy channel iron bumper and wide oval tires. SIMPSONS bears SPORTS CENTRE STORE HOURS: Open Daily a.m. to p.m. Thursday and Friday 9 o.m. to 9 p.m. Centre Village. Telephone 328-9231 ;