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Lethbridge Herald Newspaper Archives

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Lethbridge Herald, The (Newspaper) - May 16, 1972, Lethbridge, Alberta 18 THE LETHBRIDGE HERALD Tuesday, May 16, 1973 ______ Manyberries research sub-station Held day set The present and one past federal mini.ster of agriculture will hir.hliKhl l he Canada de- partment of agriculture's nn- nual fit'ld day at the Many- bcrrio.s research sub-station June ;t. The field day will kick off with the -sale by auction at 1 p.m, of 15 pure bred bulls from the CDA election sludy held at the Hlaliun. miles south- east of Mariybcrriofi. Signs will be posted for accurate direc- tion Lo the site. Bud Olson and Tlarry Hays, the present and post mentors of the federal agriculture min- ister's desk, will address the gathering of all interested fam- ilies. Included in the program will he reports on current research projects at the station, reports on beef and sheep breeding ex- periments, cross breeding re- search, range reseeding experi- ments and warble fly control in relation to the new Alberta warble free program. The visitors will be given a guided tour of the facility, lo- cated on acres of land. Although headquarters for the s( ation is in Tjelhhridge, there is a permanent slaff of 20 at Manyhcrrics. Pete Hanson is the ranch manager. Established in 1927 as a sep- arate research range station. past directors include L. B. Thompson, present Alberta Marketing Commissioner Harry Hargravcs and Dr. Ilohart Telers. It amalgamated with the Lclhbridge Research Station iu 1964 and all professional staff was moved to the city. Included on the grounds aro a d m i n i s tration, bunkhouse, cookhouse, laboratory and fecdlot facilities. A school for the staff's cluldren the only CD A sponsored school on a sta- tion in Canada. There are also separate camps for calving, cattle nnil sheep throughout the large station. Irrigated alfalfa damage from pea aphids By OR. A. M. HARPER Letliliridgc Research Station Alfalfa in the irrigated areas of southern Alberta may be se- verely damaged by the pea aphid. This Insect, which also feeds on sweet clover, trefoil, vetch, peas, broad beans, sweet peas, and several varieties of clover, la found in Alberta wherever peas and forage legumes are grown. The aphids infest mainly the growing tips of plants. Both the adults and the young suck juice [mm leaves, petioles, stems, niu'l flower buds. Infest- ed pea plants may becomo stunted and their yield and quality reduced. Injury to alfalfa is distinc- tive. A heauly im'iv.lod area in a fit Id may bo .-x-ea from a consiiU-vuble i s L a :ic Tho Ih'Tc are Minuted I'M id wille-'i: lh'..- lop U-T.r-; aro nrOi'ii tin; Im'.or 'r- yel- low or I'Yi'in a rli Hie a f T i' I od ariM hrowiii.sli, lull closrr reveals pa'di-'.s of liari- grmind. usually covered w i I h Iho whitish moiled skins of (lio jiphids. Where alfalfa growth U retarded, weeds often take over Bad crowd out the alfalfa. The adult pea aphid Is a soft bodied insect ranging In color from light to dark green. It is about three-sixteenths of an Inch long and one-sixteenth of an inch wide. The nymph is smaller but otherwise resem- bles the adult. The pea aphid overwinters as an egg on leaves and stems of alfalfa and clover. In spring when the plant resumes growth a small, light-green, wingless female hatches from each egg. These aphids, which can repro- duce without mating, feed on growing plants and give birth to other female young. Many nplmls of Hie second and third generations become winged and migrate to peas and other acceptable host plants. Here they feed and produce wingless females, which in turn give birth to other generations of Vjdlh wing.'d and vvingluss mnk'S. Tho 'lov.'lop fiom "nirlli to m.iU'iil.v in five to (lays, on v.'oalh- AH pod throughout spring and .sumnKT aro female. A summer-form f finale can produce fiom Tifl Ui ISO young during her lifetime. Whenever an alfalfa crop la cut during spring or summer, the winged aphids Icavo to search for new plants on which to live. In late September or October winged mules and wingless, egg-laying females are pro- duced. These mate and the fe- male lays her eggs on alfalfa leaves and stems. The eggs are yellow when first laid but soon turn green and then shiny black. The eggs are able to sur- vive low temperatures that kill other forms of the aphid. The predators and parasites that attack the pea apliid and thus help to keep it under con- trol usually become abundant only when the aphids are abun- dant. The predators arc mainly nabid bugs, the adults and lar- vae of ladybird beetles, and larvae of laccwings and syrpliid Ilies. The parasites are the larvae of tiny wasp-like insects that live in the aphids and kill them, A fungus disease may some- times eliminate infestations of aphids in warm, moist weath- er. Weather that Is favorable for rapid spring growth of alfalfa greatly reduces the possibility of aphid damage. Apliid infesta- tion may be reduced by very hot weather and retarded by cold weather. Heavy rains may dislodge and kill aphids. Insecticides for control of the pea aphid should only be ap- plied when plants show signs of damage. Most healthy plants can withstand a small Infesta- tion of this insect without show- ing any damage. If aphids are completely eliminated by in- secticides, the surviving preda- tors and parasites are left without food, so they move else- where. Other beneficial insects also may be damaged by the sprays. If use of an insecticide does become necessary, malathion or dimcthoate will give salis- lactoiy control. Follow closely all the directions and cautions listed on the insecticide label. Tiro new wlieat varieties licensed The Alberta department of iiKricuUure.'t; and oilseed crops specialist, Sherman Yel- land, reports that two new wheat variolas have boon li- iHMisw] bv the Canada, depart- ment of agriculture. One of those is a bearded, hard red spring wheat called Mapayo. This variety is not be- ing distributed to any growers in Alberta because it is slightly Inferior to Nccpawa. The other newly licensed va- riety is a soft red spring wheat called GkMilea. U is a very high yielding ford or utility wlieat (averages 24 per cent higher than Ntvpawa) with a kernel that is aho-.it a third larger than that of Noopawa. It ha 3 good to stem and loaf rust, common root rol, lose smut and head discoloration. It is officially described aa maturing one or two days later than Neepawa, However, Al- berta lesls have shown that it matures even hilcr than that. In the Edmonton area, it ma- tured four to five days later than Ncepawa and nt lloavor- Indge it matured four lo eight days later than Ne.opawa. In Ihe Lelhbridgo area the maturity was the same as that of Neepawa. In all regions it matured earlier than the feed wheat, Pitic 61 ;