Abstract: 【Aim】 This study aims to clarify the distribution pattern and feeding behaviors of Semiaphis heraclei on the adaxial and abaxial sides of Lonicera japonica leaves, and explore the control efficacy of spraying pesticides on the adaxial and abaxial sides of L. japonica leaves against S. heraclei, so as to provide a scientific basis for optimizing the control strategies of S. heraclei. 【Methods】 From April to May 2023, the occurrence amounts of S. heraclei on the adaxial and abaxial sides of L. japonica leaves at different leaf positions in the experimental field in Beijing were investigated every 5 d, the electrical penetration graph (EPG) technique was used to record the feeding behaviors of the 1-3-day-old adults of S. heraclei on the adaxial and abaxial sides of mature L. japonica leaves aged 30 d, and 0.027 mg/cm² imidacloprid and 0.020 mg/cm² pyrethrin were sprayed on the adaxial and abaxial sides of mature L. japonica leaves aged 30 d, respectively, and the mortality rates of the 1-3-day-old adults of S. heraclei on leaves were determined. 【Results】 S. heraclei adults were distributed on the adaxial side of L. japonica leaves at the first leaf position early and later shifted to the abaxial side. The abaxial sides of the middle part of almost all leaves consistently had significantly higher aphid numbers than the adaxial leaf sides throughout. A small number of aphids were found on individual leaves of basal leaf position, primarily on the abaxial leaf side. When S. heraclei adults fed on the abaxial leaf side of L. japonica, the probability of occurrence of aphid’s stylet salivation waveform in the phloem (E1 waveform) was significantly higher than that on the adaxial leaf side, being 2.00-fold as high as that on the adaxial leaf side, the total duration of E1 waveform was significantly longer than that on the adaxial leaf side, being 3.24-fold as long as that on the adaxial leaf side, and the probability of occurrence of phloem sap ingestion waveform (E2 waveform) was 2.25-fold as high as that on the adaxial leaf side. When S. heraclei adults fed on the xylem on the abaxial leaf side of L. japonica, the probability of occurrence of xylem sap ingestion waveform (G waveform) was significantly higher than that on the adaxial leaf side, being 1.29-fold as high as that on the adaxial leaf side, and the total duration of G waveform was significantly longer than that on the adaxial leaf side, being 2.00-fold as long as that on the adaxial leaf side, while the total duration of E2 waveform of S. heraclei adults fed on the adaxial and abaxial leaf sides exhibited no significant difference. The control efficacy of spraying 0.027 mg/cm² imidacloprid and 0.020 mg/cm² pyrethrin on the abaxial leaf side against S. heraclei adults was significantly higher than that on the adaxial leaf side, causing the corrected mortality rates of S. heraclei on the abaxial leaf side to be 2.00 and 1.79-fold as high as those on the adaxial leaf side, respectively. 【Conclusion】 S. heraclei adults are mainly distributed and cause damage on the abaxial side of L. japonica leaves, where it is more favorable for them to absorb water, and the control efficacy of spraying pesticides on the abaxial side of L. japonica leaves against S. heraclei adults is higher than that on the adaxial side.

Key words: Semiaphis heraclei, Lonicera japonica, distribution pattern, feeding behavior, electrical penetration graph (EPG), imidacloprid, pyrethrum