Abstract:

【Objective】 Two successive generations of Macrosiphum avenae (Fabricius) were studied for effects of wheat varieties on the aphid population parameters such as number of alate aphid, generation time and survival rate, also the aphid physiological parameters such as nymph developmental duration, adult longevity, fecundity, body weight, and wing-type differentiation. 【Method】 Using systematic caging methods, the population and physiological parameters were investigated on 10 wheat strains. 【Result】 There were significant differences between the varieties of M. avenae in host selection. Phototaxis of the resistant varieties to aphid was more evident. The results showed that for the parameters: Developmental duration of nymph was longer on resistant varieties; the survival rate of nymph, adult longevity, fecundity and body weight were significantly decreased. The number of alate aphids on resistant varieties was larger than that on susceptible varieties. The effects of resistant hosts to aphid physiology are perhaps exacerbated by comparing the physiological parameters through the two generations of wheat aphids. 【Conclusion】 Resistant wheat varieties have phototaxis and antibiosis to Macrosiphum avenae (Fabricius). The antibiosis of wheat to aphid has cumulative effects as aphid generations continue.

Key words: wheat, Macrosiphum avenae, population parameters, physiological parameters, wheat resistance to aphid