Abstract:  【Aim】As the main vector insect of pine wilt disease by Bursaphelenchus xylophilus in the middle and temperate zone of China, Monochamus saltuarius has caused very serious destruction to pine trees in Liaoning, Northeast China in recent years. In this study the supplementary nutrition of M. saltuarius on Pinus koraiensis was boserved and analyzed so as to provide a theoretical basis to determine the biological characteristics of M. saltuarius, to evaluate its population density and damage degree in the forest, and to determine its transmission law of pine wood nematode. 【Methods】 The newly emerged male and female adults of M. saltuarius were placed in pairs in a transparent glass jar filled with segments and branches of P. koraiensis. Under the condition of temperature 23±3℃, relative humidity 55%±5%, and photoperiod 16L∶8D, the main parts of P. koraiensis fed by M. saltuarius adults, the feeding amount of M. saltuarius adults on different parts of P. koraiensis, the adult longevity, average feeding frequency, average time of each feeding and variation rule of feeding amount with developmental time, and the circadian rhythm of the proportion of feeding frequency of M. saltuarius adults on P. koraiensis branches were continuously observed until their natural death. 【Results】 M. saltuarius adults preferred to feed P. koraiensis needles, followed by branches and buds, with the proportion of the total feeding amount of 7711%, 21.46% and 1.43%, respectively. The average longevity of M. saltuarius adults on P. koraiensis branches was 16.63±6.63 d, being 17.11±5.91 d for females and 16.14±6.77 d for males. The feeding behavior of M. saltuarius adults on P. koraiensis occurred on the 4th day after emergence, and the daily feeding amount increased first and then decreased with the developmental time, and the highest feeding amount was on the 16th day, being 526.48 mm². The feeding behavior of M. saltuarius adults occurred in every hour throughout the day, and the daily feeding frequency of male and female adults showed a state of increasing and decreasing repeatedly. 【Conclusion】 When M. saltuarius adults are reared indoors with P. koraiensis, their feeding starts on the 4th day after emergence, and there is no obvious regularity in the daily feeding amount and feeding rhythm. The feeding characteristics of adult M. saltuarius in the forest need to be further studied.

Key words: Monochamus saltuarius, Pinus koraiensis, supplementary nutrition, biological characteristics, longevity, feeding behavior