Abstract:
Objective To analyze the gallery structure and boring characteristics of Monochamus alternatus in Pinus densiflora and P. thunbergii in order to further understand the bio-ecological characters of M. alternatus in the hidden life process and benefit the application of natural enemy insects, pathogenic microorganisms, and injection drugs to control it.
Method During the overwintering period, the gallery structure of M. alternatus in P. densiflora and P. thunbergii were systematically dissected. The gallery length, blocked frass length, internal diameter of entrance holes and pupal chambers, moisture content of frass, relative orientation between entrance holes and emergence holes were measured and the relationships between body size of larvae and host species and boring characteristics were analyzed.
Result The galleries in both trees were U-shaped, single, not got through each other, blocked at the end of the entrance hole, and most of emergence holes were above the entrance holes. The boring characters of M. alternatus showed little correlation with individual body size and tree species.
Conclusion The hidden and boring characteristics of M. alternatus in xylem are relatively regular, which is less affected by the host species. Its gallery is U-shaped, and part of that is blocked by the mixture of frass and fece.
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