The life table of a local strain of grape phylloxera was determined to evaluate the resistance of the most commonly used rootstocks: Ru140, R99, and 3309C, and one local variety ‘Helwani’. The study was carried out by applying both in vitro dual culture and small root pieces testing systems. The results showed that there was a great variation in percentage mortality of immature stages, number of eggs laid, adult fertility, oviposition period, and developmental time between all tested rootstocks and the local variety, regardless of the applied testing systems. Based on the population prediction, Helwani would be a suitable host as it would be susceptible to the destructive insects in the field and the rootstocks would be resistant. However, Ru140 rootstock was more susceptible than R99 and 3309C rootstocks.
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Vol. 40 • No. 2