Abstract: The stylet penetration and suck behaviour of soybean aphid, Aphis glycines Mat., on host and non-host plants was monitored by using an electrically recording method (EPG). The results showe4 that phloem ingestion was reduced or did not happen on the non-host plants, Gossypium hirsutum, Cucumis sativa andLuria cylindrica, when compared with that on the host plant, Glycines max. The non-host plants possess resistance against A. glycines. And with the difference of the non host plants, the factors affecting ingestion and their position on the plant were different.

Key words: Aphis glycines, piercing-sucking mouthparts, feeding behaviour, host plant selection, EPG technique