The feeding activities of BPH were investigated using an alternating current electric penetration graph (AC-EPG). The total hours of sucking sieve-tube on “1A5” and “BPH26-NIL” were suppressed around to only 1 h compared to 7 h of sucking on the susceptible cultivar Taichung 65 during the 10-h exposure to BPH (Fig. 2c). Furthermore, the numbers of probes on “1A5” and “BPH26-NIL” were higher than those on the susceptible cultivar Taichung 65 (Fig. 2d).