Abstract
ABSTRACT Monochamus alternatus alternatus is a vector of pine wilt disease and has facultative diapause at the final larval instar. To determine the maternal effect on diapause and life-history traits of offspring, two sorts of rearing experiments were implemented. Two experiments indicated that the body mass of females did not affect the induction of offspring diapause and the heritability of adult body mass did not differ from zero. In another experiment, adults that underwent diapause at three crowding levels of 1, 2 and 4 larvae/pine bolt were allowed to oviposit during their lifetime. Newly hatched larvae were inoculated singly on Pinus thunbergii bolts. Development time from larval inoculation to adult emergence and adult body mass of diapause-forgoing offspring were not affected by larval crowding level in the maternal generation, maternal age, bark surface area of the bolt (a proxy for amount of food available) or offspring sex. Body mass and head capsule width of larvae in diapause decreased with the maternal age but increased with the bark surface area. However, there was no effect of crowding level in the maternal generation. In conclusion, this study found no maternal effects on the induction of offspring diapause, although the influence of maternal photoperiodic and temperature conditions remains to be determined.
Published Version
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