Abstract: Field investigations and laboratory experiments were conducted to explore the dangers of Bactrocera dorsalis on passion fruit and the passion fruit influence the growth and development of Bactrocera dorsalis. The field investigation showed that the adult Bactrocera dorsalis was found in passion fruit plantations in Guangxi and Guangdong, and the traces of damage could be seen on the pericarp of passion fruit, but the pulp was intact. The eggs of Bactrocera dorsalis were found in 51.7% of fruit victims. Laboratory experiments showed that Bactrocera dorsalis could lay eggs on passion fruit, and the average number of oviposition marks was 1.73/fruit, and the pupation rate was 94.2%. Bactrocera dorsalis could not complete its life cycle on the peel of mature fruits. Compared with the peel, passion fruit flesh significantly improved the pupation rate and eclosion rate, but it was still lower than the banana control group. The sugar content and pH of mature passion fruit were 17.72% and 1.78, respectively,which were not conducive to the oviposition and growth of Bactrocera dorsalis. In conclusion, Bactrocera dorsalis can complete its growth and development on the passion fruit, but passion fruit was not a suitable host for Bactrocera dorsalis.

Key words: passion fruit, Bactrocera dorsalis, damage, pupation rate, eclosion rate