Comparison of feeding behavior of the bean bug, Riptortus pedestris, on the bean plant and pod using Electrical Penetration Graph (EPG) Technique

Wednesday, November 13, 2013
Exhibit Hall 4 (Austin Convention Center)
Hye-Ri Kwon , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Sang-Eun Park , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Sae-Hee Kim , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Na-Yeon Ko , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Tae-Hee Ryu , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Jeong-Gon Kim , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Hyo-Seob Shin , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Mi-Ja Seo , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Yong-Man Yu , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Young-Nam Youn , Department of Applied Biology, Chungnam National University, Daejeon, South Korea
Legumes, rice and fruit trees from damage caused by Riptortus pedestris has been increasing and has drawn a lot of interest in control. R. pedestris is the typical sucking insect damaging the plants with stylet. If R. pedestris had damaged bean pods, it caused to be decreased the quality of crop. Thus, we could observe the feeding behavior of the R. pedestris using the EPG system and identify the characteristics of the stylet pathway activities. In this study, we recorded the feeding behavior of R. pedestris on Woltalikong (Phaseolus vulgaris L.) of leguminous crop during 5 hours and various feeding patterns were observed so that eight different EPG waveforms were characterized. The characteristic patterns of feeding behaviors investigated were as follow. Waveform NP occurred when the insect was resting on the leaf. Waveform Z occurred irregularly when the R. pedestris was searching the sucking place. Waveform PA appears when the stylet had just penetrated into the epidemic cell of plant. And then waveform PB which its stylet secreted saliva was observed. Waveform PC1 and PC2 involved the penetrating and sucking behavior in parenchyma cells, respectively. Waveform PE1 and PE2 were appeared when its stylet tips located phloem. When feeding the pod, first reaction time is short. Also we confirmed that most of them keep on feeding when once they have been started stylet penetration on the pod. Further study, location of stylet tips in the pod is histologically related to EPG waveforms by transmission electron microscopy observations after stylectomy.
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