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Lethbridge Herald Newspaper Archives

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Lethbridge Herald, The (Newspaper) - September 4, 1973, Lethbridge, Alberta THE LETHBftlDGE HERALD 11 Two fungal diseases reduce potato crop By DR. G. A. NELSON Plant Pathologist Lethbridge Research Sta- tion Early and late blight are two fungal diseases that can substantially reduce the yield of potatoes. It is important to recognize these two blights in order to initiate control measures at the proper time. Dead spots on potato leaves caused by wind, in- sects, other types of mechanical injury are often confused with the two diseases. Seven calf transplants successful NEILBURG, Sask. (CP) Seven calf embryoes have been successfully developed from unfertiliz- ed eggs transplanted from a single donor cow into separate host mothers. The transplants, from a high quality Maine-Anjou, all were fertilized The donor cow has also become pregnant by natural means. Harold E. Biensch of Pinetree Ranch Ltd. said more eggs will be taken from the mother after she calves. By transplanting eggs into ordinary cows, a rancher can get the benefits of a strong lineage without the normal costs and the delays involved in producing one calf at a time by natural methods. Late blight occurs oc- casionally in central and northern Alberta but rare- ly in southern areas. The development of late blight is favored by nighttime temperatures of below 60 degrees Fahrenheit com- bined with relative humidities of 90 to 100 per cent followed by warm daytime temperatures. the symptoms appear first on the upper side of the leaves as pale green spots about the size of a five- cent piece. These spots usually enlarge, turn purple to black, and become surrounded by yellow borders. A downy fungal growth containing the spore- bearing structures of the pathogen develops on the undersides of the spots. These structures are carried by wind to healthy plants and infect the leaves or may drop through cracks in the soil and infect the tubers Infected tubers develop a purplish discoloration of SILAGE TESTED An Agriculture Canada researcher atAgassiz, B.C., is ensiling complete feeds for dairy cattle. The silage includes corn, forage, urea, minerals, vitamins and barley or oats. At 30 per cent concentrate in the silage mixture, lactating cows show no depression in milk fat tests when fed on the ensiled complete feed. The experiments should provide information for dairymen who are con- sidering methods of using complete feeds for their herds. Culligan water conditioners can clear up your water problems fast. Call us for a free water analysis and installation esti- mate. Ask your neighbors about the won- derful benefits of filtered soft water. Call 327-7876 and say..... CULLIGAN WATER CONDITIONING LETKBRIDGE LTD. 120 North Mayor Migrath Drive Lethbridge the skin and reddish-brown streaking of the underlying flesh. In storage, damage starts as a dry rot. which under very humid con- ditions becomes a soft rot that can completely destroy the stored tubers. To prevent the tubers from becoming infected during harvest, diseased tops should be destroyed 10 days before digging. Infected tubers should be culled out. The sound tubers should be placed in cool storage and ventilated well to avoid free moisture on the tubers. Infected tubers should not be planted and growth on refuse piles should be destroyed to avoid sources of infection in the following year. Early blight, unlike late blight, occurs in most potato-growing areas of during periods of heavy dews and frequent rainfall. The first symp- toms are dark brown to black spots abouut one- quarter of an inch in diameter on the leaves. These spots enlarge and develop a series of target- like, concentric, dark, and light rings. Heavily- infected leaves die and drop off. Under very humid conditions the plants in an entire field may be destroyed. Tubers on affected plants may develop brown to purplish sunken spots on the surface and a shallow brown rot in the flesh. While early blight is not usually as serious a disease as late blight, it has reduc- ed potato yields in some years. If conditions are favorable for the develop- ment of either late or eatfy blight, the fields may be sprayed with protective fungicides registered for this use. The crops should not be sprayed before sprinkler irrigation or ex- pected rains to avoid washing the fungicide off the plants. The Lethbridge Research Station is work- ing in co-operation with the Alberta Potato Com- mission in setting up ex- perimental plots near Taber and Edmonton to determine the extent of loss from early blight and to develop more effective measures of control. V GERRY'S TRADING POST DOWNTOWN MACLEOD PHONE 234-3166 FRIDAY and 7th and 8th Shop this STORE WIDE SAVINGS SPECTACULAR Meet the SALES REPRESENTA- TIVES from these well known manufacturers who will be on -hand to answer all questions ADMIRAL JOHN DUBYNA DUCAN INDUSTRIES BRUCE LOWE LOWE Embassy Chrome and Acme Restonic Bedding CEC FINDLAY FINANCING AVAILABLE GERRY'S TRADING POST DOWNTOWN FORT MACLEOD PHONE 234-3166 ;