Effect of host fruit maturity on the development and reproduction of the oriental fruit moth, Grapholitha molesta (Busck)
Author of the article:WANG Chong** YANG Xiao-Fan FENG Na FAN Fan WEI Guo-Shu***
Author's Workplace：Agriculture University of Hebei, Baoding 071001, China
Key Words：Grapholitha molesta, maturity, development, reproduction, life table
To explore the effect of host fruit maturity on the development and life table parameters of the oriental fruit moth (Grapholitha molesta). [Methods] Larvae of the oriental fruit moth were reared on fruits at different stages of maturity under laboratory conditions of (26±0.5)℃, RH 70%±10% and a photoperiod of 15L: 9D. [Results] The development duration and reproductive productivity of the oriental fruit moth were significantly affected by host fruit maturity. There were no significant differences in the duration of the larval stage between young and early growth stage fruit, however, the duration of the larval stage was shortest on late growth stage, and mature stage, peaches (10.44 d and 9.42 d, respectively). Larval survival rates on apples were highest on young, early growth stage and late growth stage fruit (3.47 %, 13.04 % and 25.35 %, respectively), but on pears were highest (39.70%) on mature stage fruit. Female moths laid most eggs on young and early growth stage apples (138.33 and 145.33 eggs per female, respectively), on late growth stage peaches (151.90 eggs per female), and on mature stage pears (182.12 eggs per female). Analysis of life-table parameters indicated that the net reproductive rate was highest on young apples (8.60), on late growth stage peaches (19.42), and on mature stage pears (47.44). The highest rates of increase was recorded on young apples (0.0632), early and late growth stage peaches (0.0210 and 0.0999, respectively), and on mature stage pears (0.1117). [Conclusion] Our results suggest that G. molesta prefers young apples, early and late growth stage peaches, and mature stage pears. Control measures for this pest should take this information into account.