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In 1970 —72 the effect of powdery mildew on Finnish spring wheats with different field resistance was studied. For the mildew control 1 kg/ha Karathane WD (22.5 % Dinocap) was used. These investigations showed that mildew control increased grain yields in susceptible varieties by 2.4 to 6.6 %. The 1000-grain weight increased by 2.2 to 5.3 %, respectively. On the more field resistant spring wheats mildew control had no particular effect. Mildew control evened out the relative yield differences between the varieties. The paper includes notes on the occurrence of mildew in Finland while the need for resistance breeding is also discussed. Reports from various Scandinavian countries indicate that powdery mildew is considered a very important plant disease, which causes great yield losses in wheat and barley (Hermansen 1968, Johansen 1963, Leijerstam 1962, 1965, 1972b, Svensson 1971). In Finland the amouts of yield losses caused by mildew are not known. Mildew is, however, frequent in most wheat fields every year, and many varieties display a high percentage of infection (Nissinen 1969). In the present paper an attempt is made to clarify the effect of powdery mildew on spring wheats and to discuss the importance of mildew resistant varieties in Finnish conditions. Material and methods The tests were carried out at The Hankkija Plant Breeding Institute. The trial fields and the varieties used in the tests are presented in Table 1. The method used was split plots with 4—6 replicates. Each plot measured 8 sq.m. The plots were fertilized with 1000 kg/ha of compound fertilizer. Thus 150 kg N, 88 kg P and 126 kg K were applied per hectare.

Effect of powdery mildew (Erysiphe graminis f.sp. tritici) on spring wheat in Finland