Abstract: 【Aim】 This study aims to explore the mating behavior patterns for adults of the bamboo weevil, Cyrtotrachelus buqueti Guerin-Meneville. 【Methods】 We recorded the whole mating process of C. buqueti  adults by the combination of laboratory rearing with field observation and compared the differences in mating behaviors of C. buqueti adults on different hosts and with various body sizes. 【Results】 The results showed that a complete mating of C. buqueti adults involves four phases, i.e., courtship display, pair-bonding, ejaculation and post-copulation guarding. There were multiple mating behaviors in the whole mating process of the female and male adults of C. buqueti. Laboratory observation showed that one copulation of C. buqueti lasted 21.71±1.84 min, the courtship display lasted 0.46±0.05 min,the pair-bonding lasted 6.18±0.38 min, and the ejaculation and post-copulation guarding lasted 8.36±0.62 min and 6.71±0.79 min, respectively. In virgin males, the time for courtship display, pair-bonding and ejaculations was significantly longer than that in mated males (P<0.05). The time for courtship display (0.46±0.05 min) and ejaculation (8.36±0.62 min) of C. buqueti mated on Sinocalamus afris was significantly longer than that on Sinobambusa tootsik, Bambusa pervariabilisi × Dendrocalamopsis daii,  Bambusa multiplex and  Arundo donax , and there was the longest time of post-copulation guarding or placation on Bambusa multiplex (P<0.05). C. buqueti adults preferred to choose spouse in large body size for mating. When male body length was ≥3.3 cm or 3.0-3.2 cm, the time of courtship display, pair-bonding, ejaculation and post-copulation guarding of males with different body lengths was longer than those of females (P<0.05). Mating behavior of C. buqueti observed in the field was basically consistent with the results observed in the laboratory. 【Conclusion】 The results could help us understand the mating behavior of C. buqueti adults, and further provide scientific basis for the research of adult reproductive behaviors and behavior control technology of this insect.

Key words: Cyrtotrachelus buqueti , mating behavior, courtship display, pairbonding, ejaculation, postcopulation guarding