Abstract: The peach fruit borer, Carposina sasakii, is an important pest of deciduous fruit trees in northern China. In order to explore the influence of host plants such as apricot (Armeniaca vulgaris), plum (Prunus salicina), peach (Amygdalus persica), jujube (Ziziphus jujuba), apple (Malus pumila), and pear (Pyrus sorotina) on the development and reproduction of this pest, experiments designed to examine the developmental duration and reproduction of the pest feeding on various host plants were carried out under laboratory conditions of 23±1℃, RH 80%±7% and a photoperiod of 15L∶9D. The results showed that the peach fruit borer exhibited significant differences in the developmental duration and reproduction among various host plants. Larval duration was the longest on pear (19.15 d) and the shortest on plum (12.48 d), while the preimaginal survival rate was the lowest on pear (17.91%) and the highest on plum (50.54%). Adult females derived from larvae reared on jujube and peach laid significantly more eggs (214.50 and 197.94 eggs laid per female, respectively) compared with those reared on the other host plants. Lifetable parameters were calculated for each host plant and compared by jackknife procedures. Analysis indicated that the net reproduction rate (R₀) was the greatest on jujube (117.49), the mean generation time (T) were the longest on pear (41.31 d) and apple (41.51 d), while the intrinsic rate of increase (r_m) was the greatest on plum (0.1294), followed by jujube and apricot (0.1201 and 0.1128, respectively). The results will help to understand the population dynamics of this pest feeding on various host plants.

Key words: Carposina sasakii, host plant, developmental duration, fecundity, survival rate, life table parameters