For the comparing the feeding behavior of Nilaparvata lugens on different rice varieties, electrical penetration graph (EPG) technique was used. The feeding behavior of N. lugens with EPGs might be distinguished with each rice variety. The correlation between EPG patterns types and feeding behaviors were investigated and observed honeydew excretion. It might be analyzed the host plant preference of the rice brown planthopper with spending time of EPG patterns. 1. The EPG patterns divided into 6 types according to electrical specific feature. Type 1 pattern was a searching feeding site, resting or wandering on a rice plant. Type 2 pattern was appeared when the insect uptake from phloem sieve element. Type 3 pattern was appeared when the insect piercing in the rice plant. Type 4 pattern was appeared when the insect salivated in rice plant. Type 5 pattern was appeared when the insect ingested from the xylem. Type 6 pattern was appeared when the stylet was moved in cell. 2. The result of EPG patterns analyzed, spending feeding time on Gum-nam was significantly shorter than Dong-jin, Dae-ahn, Dong-ahn, and Dae-san variety. And N. lugens was for long time on Gum-nam. 3. The total number of excreted honeydew droplets from the brown planthopper were the highest on Dong-jin variety and the lowest in Gum-nam variety. Honeydew droplets in proportion to phloem feeding time. 4. As results of EPG patterns and honeydew droplets analyzed, N. lugens was preferred Dong-jin, Dong-ahn, Dae-san, Dae-ahn to Gum-nam, Da-san, Nam-chun rice plant variety.
Species 1: Homoptera Delphacidae Nilaparvata lugens (rice brown plant hopper)
Keywords: feeding behavior, electrical penetration graph (EPG)
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