| dc.description | The author discusses two leaf spotting fungi commonly found to cause slight to severe damage to the foliage of spring, winter and durum wheat varieties in North Dakota, Pyrenophora trichostoma, causes a disease called leaf blight, tan spot or yellow leaf blotch, and Lepfosphaeria avenaria f. sp. triticea, which causes a disease called blotch or septoria leaf spot. Both diseases appear as brown spots that spread on susceptible wheat varieties and eventually kill entire leaves. Both the leaf blight and blotch fungus live through the winter in wheat stubble and straw. A study conducted in 1971 to quantitatively chart factors influencing leaf spot severities and wheat loss was conducted at the North Dakota Agricultural Branch Experiment Stations.This is presented. Results indicate that grain farmers can reduce disease severeity and related yield decline by removing infested wheat stubble and growing wheat varieties which are resistant to these diseases. It was concluded that each of these control measures (protective
fungicides, removal of stubble and selection of resistant varieties) requires further study. | |
