Experimental release of a parasitoid, Dastarcus helophoroides (Coleoptera: Bothrideridae), on Monochamus alternatus (Coleoptera: Cerambycidae) infesting Pinus densiflora in the field
2004
Urano, T. (Forestry and Forest Products Research Inst., Kyoto (Japan). Kansai Research Center)
Dastarcus helophoroides adults were released on pine stems infested by Monochamus alternates in field plots. Twenty live pine trees were cut and the stems were set vertically in the plots without being cut into logs. M. alternatus was allowed to oviposit on the stems, and D. helophoroides adults were released on 10 of the 20 stems (released stems) in the following year. Mean percent parasitism on released stems was 34.8% but differed considerably among the stems (range 6-69%). Although released parasitoids had a negative effect on the host population, percent parasitism on adult M. alternatus was relatively low. No parasitism by dispersing D. helophoroides adults was observed on 8 non-released stems, which were 1.5-7.7 m away from the released stems. Generally, percent parasitism was maximized in the middle height range of stems and was low in the upper range.
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