Parasitism of Prepupae of Monochamus alternatus (Coleoptera: Cerambycidae) by Dastarcus helophoroides (Coleoptera: Bothrideridae)

doi:10.16409/j.cnki.2095-039x.2024.07.024

Abstract

Abstract: Dastarcus helophoroides is an effective natural enemy of Monochamus alternatus. This study investigated parasitism of prepuae of M. alternatus by D. helophoroides through inoculation of newly hatched D. helophoroides larvae onto the surface of M. alternatus prepupae at ratios of 6:1, 8:1, and 10:1 under controlled laboratory conditions and compared development period and offspring numbers of D. helophoroides. Further, a forest release experiment was conducted. The results showed that, under the three inoculation ratios, D. helophoroides parasitism rates of M. alternatus prepupae were 85%, 90%, and 75%, respectively. The larval developmental period of D. helophoroides ranged from 7 to 11 days, with no significant differences across the inoculation ratios. However, a significant difference was observed in the pupal duration, which averaged 26.24 days, 25.28 days, and 22.67 days for the 6:1, 8:1, and 10:1 inoculation ratios, respectively. The number of cocoons and the emergence rate also showed significant differences: the average number of D. helophoroides cocoons per prepupa was 4.29, 4.94, and 6.93, respectively, while the emergence number was 4.00, 4.89, and 6.73 per prepupa, respectively. The cocooning rate of D. helophoroides did not differ significantly among the inoculation ratios. The total weight of D. helophoroides adults produced from a single prepupa was 0.092 g, 0.097 g, and 0.079 g, with no significant differences between the groups. The average weight of a single D. helophoroides adult was 0.024 g and 0.020 g for the 6:1 and 8:1 ratios, respectively, and was 0.013 for the 10:1 ratio, which was a significant decrease from the other two ratios. In the fields, the D. helophoroides parasitism rate of M. alternatus prepupae varied significantly across the inoculation ratios. When the beneficial-to-pest ratio was 10:1, the corrected parasitism rate was the highest, averaging 72.29%. At 8:1, it dropped to 48.55%, and at 6:1, the rate was the lowest, at 40.63%. These findings indicate that D. helophoroides exerts a strong parasitism of M. alternatus prepupae, and a beneficial-to-pest ratio of at least 10:1 in releasing D. helophoroides is recommended for optimal control of M. alternatus.

Key words: Dastarcus helophoroides, Monochamus alternatus, prepupae, parasitism rate

CLC Number:

S476.2

WANG Lina, CAO Ping, TANG Yanlong, QIAN Zhengmin, LIU Lingling, WEI Ke, ZHANG Yanlong. Parasitism of Prepupae of Monochamus alternatus (Coleoptera: Cerambycidae) by Dastarcus helophoroides (Coleoptera: Bothrideridae)[J]. Chinese Journal of Biological Control, 2025, 41(3): 674-679.

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