Two-sex life table of Cydalima perspectalis on Hyrcanian boxwood, Buxus hyrcana and littleleaf boxwood, Buxus microphylla
Paper ID : 1912-24IPPC (R2)
Authors
1 guilan university
2Faculty of Agricultural Sciences, University of Guilan
Abstract
The box tree moth, Cydalima perspectalis (Walker) is the most important and monophagous pest of Buxus species worldwide, accidentally imported to Iran in 2016. In this research, the effects of Hyrcanian boxwood, Buxus hyrcana and littleleaf boxwood, B. microphylla, were evaluated on the life table parameters of C. perspectalis. Different larval instars were collected from Lahijan (Guilan, Iran) and transferred to the laboratory. To study the life table parameters, the same aged eggs (100 eggs) of the F2 generation reared on the respective boxwood species were used in the experiments. The experiments were carried out at 26 ± 1 ºC, relative humidity of 75 ± 5% and 16:8 (L:D) h. The life history data for C. perspectalis were analyzed by the age-stage, two-sex life table approach using TWOSEX- MSChart program. The results showed that C. perspectalis was able to develop, survive and produce eggs on both boxwood species. The incubation periods of C. perspectalis were significantly affected by host plants and were 4.05± 0.039 and 3.84±0.03 days on B. hyrcana and B. microphylla, respectively. However, the larval developmental and pupal times did not significantly differ on two plant species and were evaluated to be 25.24±0.42 and 25.68±0.63 days (larval stage) as well as 10.7±0.19 and 10.34±0.25 days (pupal stage) on B. hyrcana and B. microphylla, respectively. Moreover, the total developmental times (egg to adult emergence) of C. perspectalis were 41.62 and 41.46 days on B. hyrcana and B. microphylla, respectively. The male and female adult longevities were 10.14±0.70 and 11.88±0.80 days on B. hyrcana and 10.67±1.06 and 12.53±1.07 days on B. microphylla, respectively. According to the results, there was a significant difference in fecundity of females on two boxwood species. So that, females of C. perspectalis laid 412.82 and 286.06 eggs on B. hyrcana and B. microphylla, respectively. The life table parameters showed that the intrinsic rate of increase (r) value was evaluated to be 0.092 day-1 on B. hyrcana which was significantly higher than on B. microphylla (0.077 day-1). Similarly, the finite rate of increase (λ) had a significant difference among two boxwood species. However, the mean generation time (T) and net reproductive rate (R0) of C. perspectalis were not significantly different on host plants. These findings would be useful to establish an effective management program to control this invasive and serious pest.
Keywords