Diets for rearing the ambrosia beetle of tea, xyleborus fornicatus (coleoptera: scolytidae), in vitro
1977
Sivapalan, P. | SHIVANANDARAJAH, V.
An artificial diet consisting of sucrose, casein, yeast extract, tea bark extract and cellulose powder was suitable for rearing Xyleborus fornicatus Eichh. through several successive generations in the laboratory. Since the flightless adult male progeny seldom emerged, diet evaluations were based on the number of emerging adult female progeny. At 28° and 75% R.H. the emergence of progeny adult females occurred 40-70 days after the date of inoculation of the parent female. The number emerging from these laboratory cultures far exceeded the average brood size observed under field conditions. Cellulose powder was found to offer the critical physical consistency needed for tunnelling. At 75% R.H., the beetles bred successfully in the temperature range of 24°-32°. Under uniform laboratory conditions in total darkness, emergence followed a definite rhythm, with peak emergence at 12.00 h. Since the observations were made on the progeny of beetles reared continuously in the laboratory in total darkness for more than ten generations, such a rhythm appears to be an in-born endogenous character that is independent of external environmental variations.
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