The stylet penetration activities of Diaphorina citri Kuwayama on seedlings of Citrus reticulata Blanco (Rutaceae) were investigated by using the electrical penetration graph (EPG-DC system) technique,and the relationship between the feeding behavior and the waveforms was analysed. Eight EPG waveforms were described for adult female D. citrifeeding on C. reticulata leaves during 8 hours: Non-penetration waveform (waveform np), pathway waveforms (waveform A, B and C ), first contact with phloem (waveform D), saliva secretion on phloem (waveform E 1 ), phloem sap ingestion (waveform E2 ), and xylem sap ingestion (waveform G). Among these, waveform D, which always occurred between waveform C and waveform El ,was firstly found in insect with piercing mouthparts. Waveform G only occurred on 3 of the 20 tested psyllids, implying the psyllids seldom feed in the xylem. Waveform E2 lasted longest, indicating the psyllids spent the most of time in phloem sap ingestion during the feeding activity.%利用刺吸电位图谱(EPG)技术对亚洲柑橘木虱Diaphorina citri Kuwayama在寄主植物酸橙Citrus reticulata Blanco上的刺探取食行为进行了测定,获得柑橘木虱取食出现的波形,初步确定了取食波形与其行为之间的关系.结果表明,亚洲柑橘木虱在酸橙上产生8种主要的取食波形,依次为非刺探波(np波)、路径波(A波、B波、C波)、D波、韧皮部分泌唾液波(E1波)、韧皮部被动吸食波(E2波)以及木质部主动吸食波(G波).其中,D波是首次发现在刺吸式口器昆虫的取食波,推测为柑橘木虱口针刺探筛管相关的波形.G波仅在所测定20头木虱中的3头上出现,说明木虱很少在木质部吸食.E2波持续时间最长,表明刺探过程中木虱口针在韧皮部吸食的时间最长.
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