Biological parameters of the bark beetle, xylosandrus crassiusculus (motschulsky)‎ under controlled laboratory conditions

الملخص EN

Biological parameters of the bark beetle, xylosandrus crassiusculus (motschulsky) (coleoptera: curculionidae: scolytinae) was investigated under different temperature regimes (27, 29, 31 and 35ºc).

the females reared at 29°c, lived 30.93±2.36 days for oviposition.

the female laid a maximum of 6.71±1.89 eggs per day and a maximum of 6.99±1.33 batches per female.

each batch had an average of 13.78±2.01 eggs.

the mean total fecundity recorded was 67.8±4.25 eggs, with a shortest egg incubation period.

at 29°c, the duration of the larval stage was 20.17±2.89 days, the pupal stage 5.03±1.11 days, and the life span of the adult insect was 29.44±3.19 days.

significant differences (p<0.05) were noted when the duration of the different life stages under 29 and 35ºc were compared, with longer duration at 29°c.

insects reared at 35°c had narrower bodies and smaller sizes.

furthermore, the developmental stages period, including the ovipositional period (days) were negatively correlated with temperature.