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The parasite‐host relationship between Encarsia formosa Gahan (Hymenoptera, Aphelinidae) and Trialeurodes vaporariorum (Westwood) (Homoptera, Aleyrodidae)

The walking, probing and feeding behaviour of newly hatched females of the greenhouse whitefly Trialeurodes vaporariorum is analysed on plants of 3 species: tomato (Lycopersicon esculentum), sunflower (Helianthus annuum) and red ash (Fraxinus pennsylvanica). On tomato the relative time spent by the insects increased in the order walking‐probing‐feeding on the veins, where they feed. A same, but not significant trend is found on sunflower. On red ash, a non‐host‐plant species, the whiteflies made series of short probes in rapid succession, but hardly any feeding behaviour was observed.