Acta Entomologica Sinica (1997) 40, 135-144

Guolin Xie, Wuyao Pan, Ziying Tang, Decheng Ding and Junhe Lian (1997)
[Evaluation on the effective and stable control of Hemiberlesia pitysophila Takagi with Coccobius azumai Tachikawa]
Acta Entomologica Sinica 40 (2), 135-144
Abstract: Coccobius azumai Tachikawa which was introduced from Okinawa, Japan, was first released and successfully established in Huidong County, Guangdong Province in 1989. Since then systematic observation and investigation were made. The result showed that a year later the parasitism rate of C. azumai on Hemiberlesia pitysophila reached as high as 55. 8%~64.2% within 50 m from the released site and the density of female H. pitysophila was reduced from 3. 41 to 0. 64 per needle. Two years later the effective control radius had increased to about 300 m. The parasitism rate ranged from 20. 8% to 32. 9%. The density of female H. pitysophila became as low as 0. 6 per needle. Both C. azumai and H. pitysophila were in a balanced state of low density, whereas in the areas where no C. azumai was released, the density of female H. pitysophila had increased from 3. 4 to 4.22 per needle, 6~10 times higher than that in the released area. Judging from the spreading speed, competitive ability and the number-stabilizing level of C. azumai, it is concluded that Marietta carnesi (Howard) had only a hyperparasitism rate of 3.10% ~ 5.3% so that it had no influence on the control efficiency of C. azumai.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
classical biocontrol/new introduction
population dynamics/epizootiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Hemiberlesia pitysophila		China (south)
Coccobius azumai (parasitoid)			Japan
Coccobius azumai (parasitoid)	Hemiberlesia pitysophila		China (south)