Chinese Journal of Entomology (1991) 11, 25-38

C.C. Chien, Y.I. Chu and H.C. Ku (1991)
Biological control of citrus psyllid, Diaphorina citri in Taiwan. II. Evaluation of Tamarixia radiata and Diaphoencyrtus diaphorinae for the control of Diaphorina citri
Chinese Journal of Entomology 11 (1), 25-38
Abstract: The experiments conducted to evaluate the efficiencies of Tamarixia radiata (Waterston) and Diaphorencyrtus diaphorinae (Lin and Tao) against Diaphorian citri Kuwayama. From October 1987 through June 1990 one site with pots of Murraya paniculata Linnaeus, seven sites of M. paniculata fencing and two citrus orchards (Citrus sinensis Osbeck )in Taichung, Changhua, Kaohsiung and Pingtung were Investigated. The results showed that the introduced parasitoids T. radiata is capable of keeping D. citri at low density under relative stable habitats where M. paniculata was alternatively or occasionally pruned. The indigenous parasitoid D. diaphorinae has adapted to unstable environments, however it only provides partial control on the psyllid due to 25.5-51.0% of hyperparasitism throughout the island and the low density from February to April especislly in central areas of Taiwan. In the Taichung area, T. radiata predominated over D. diaphorinae, but the two wasps did not overlap in prevailing period, and their total percentage of parasitism were 80-100% from February to April and 32-80% for the rest of the year. At present, T. radiata has 5.6% hyperparasitism by the indigenous hyperparasitoids, and the percentage of hyperparasitism has been increasing gradually. The methomyl application in citrus orchard gave good psyllid control, however it also reduced parasitism to 0-4%. On the contrary, the parasitoids caused 15.5-46.7% parasitism in the untreated citrus orchard with about 0.1-0.4 adult psyllids per 10 cm lengty branch.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Ching-Chin Chien

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
control - general
Research topic(s) for beneficials or antagonists:
population dynamics/epizootiology
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diaphorina citri	Citrus (genus)	Taiwan
Tamarixia radiata (parasitoid)	Diaphorina citri	Citrus (genus)	Taiwan
Diaphorencyrtus aligarhensis (parasitoid)	Diaphorina citri	Citrus (genus)	Taiwan