Biotypic variation in Russian wheat aphid (Diuraphis noxia Kurdjumov Homoptera: Aphididae) between Hungary and South Africa
2002
Basky, Z.
Sixty wheat lines were studied in Hungary and South Africa to determine their reaction to Diuraphis noxia (Kurdjumov). Plants were infested with D. noxia at the two-leaf stage and scored on a scale of one to ten for Russian wheat aphid damage after one, two and three weeks. A score of one indicated very high resistance and ten extreme susceptibility. A free choice test was conducted to evaluate antixenosis effect of the wheat lines. Antibiosis of 50 wheat lines was determined with the embryo count method. None of Hungarian lines proved to be resistant in Hungary or South Africa. Based on the damage rating scores, the resistant lines were resistant in South Africa, but all were susceptible in Hungary.
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