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Virulence frequencies in powdery mildew populations erysiphe graminis f sp hordei and erysiphe graminis f sp tritici in denmark 1987



Virulence frequencies in powdery mildew populations erysiphe graminis f sp hordei and erysiphe graminis f sp tritici in denmark 1987



Tidsskrift for Planteavl 91(4): 375-386



The present paper summarizes results obtained in 1987 in the Danish National Virulence Survey. The main object was to analyze the airborne barley and wheat powdery mildew population twice at ten localities. Virulence frequencies were estimated from colony countings on seedlings in mobile nurseries. Results obtained in April/May have been used to forecast early attacks of powdery mildew in commercial varieties during the growth season. Only minor changes were found in the barley powdery mildew populations from 1986 to 1987. The following resistances were found to be very effective under Danish conditions: Tu (Ml-a3+Ml-(Tu2)), Ri (Ml-a3), Ru (Ml-a13) and Mlo (ml-o). The varieties Benedicte (Ml-a9+?) and Hulda (Ml-a7+Ml-k+?) also showed quite effective resistances, shown by low corresponding virulence frequencies. The frequency of Ml-a1 virulence varied on Sjaelland from 2-5 and in Jylland from 10-20 in most cases, and this reflects an increase compared to 1986. V-a9, V-a10 and V-a7 were found with frequencies from 20 to 40 on average. V-(La) and V-(ra) were in most cases found with frequencies from 50 to 90. In April/May there were not seen any significant difference between localities. But later on in June/July, some obvious differences developed between the populations on Sjaelland and in Jylland. V-a1, V-a12 and to some extent V-a9, were most frequent in Jylland, and this is in accordance to observations from 1985 and 1986 (4,6). The wheat varieties Sleipner (Pm 2+6+8), Kosack (Pm 4b) and Holger (Pm 6) contained the most effective resistances in wheat varieties on the Danish National List of Varieties. On the other hand, the variety grown most at the moment, Kraka (Ml-i), had corresponding virulence frequencies close to 100, or similar to that of Anja, which was used as suceptible control.

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