Abstract: Abstract: [Objective] Probing graphs of Adelphocoris suturalis were investigated in the laboratory for understanding feeding behaviors of the insect on different host plants. [Method] The probing waveforms of A. suturalis on green bean, alfalfa, cauliflower, wheat and cotton were analyzed with DC-EPG.. [Result] The probing waveforms of the insect on five hosts consist of four parts, Ⅰrepresents stylet thrusting into plant tissue; Ⅱ represents multiple-cell laceration and salivation; Ⅲ represents ingestion; Ⅳ represents withdrawal of stylet from the plant tissue. The probe duration and Ⅲduration per probe by A. suturalis on alfalfa were significantly longer than other hosts, while the insect much preferred the growing point than other structures (cotyledon and leaf). [Conclusion] The probing waveforms of A. suturalis are defined by this experiment, which can be used for evaluating resistance of host to A. suturalis. Alfalfa and growing point of cotton in this test are the best foods the insect preferred.

Key words: Adelphocoris suturalis, probing behavior, EPG, host crop, structures