INDIRECT CONTROL OF PINE WOOD NEMATODE BY RELEASING SCLERODERMA GUANI

23 test points were set up at 7 releasing regions including Shenzhen Forest Farm in June, 1994 and a total about 500000 parasitic wasps, (Scleroderma guani) were released on to pine forest to control the pine sawyer (Monochamus alternatus Hope), a vector of pine wood nematode. The parasitic rate was 25.6%～46.9% averaged 35.2%, in the first generation of the wasp covering an area about 18 ha. Owing to the multiplication and expansion of this wasp in the forest, the controlled area reached up to 162.5ha. in October and November and the withering rate of pine trees caused by pine wood nematode disease was about 2.63%, while that in the check regions where no wasp has been released was about 10.33%. The control effect counted as 67. 99%～86.59%.

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