Formosan Entomologist (2007) 27, 277-292

Ching-Chin Chien, Shiu-Chih Ku and Shu-Chen Chang (2007)
[The effect of common insecticides on two parasitoids (Hymenoptera: Eulophidae) of Liriomyza trifolii (Burgess) (Diptera: Agromyzidae)]
Formosan Entomologist 27 (4), 277-292
Abstract: In Taiwan Hemiptarsenus varicornis (Girault) and Neochrysocharis formosa (Westwood) are important native parasitoids of Liriomyza trifolii (Burgess). Seedlings of field bean with either parasitoid or L. trifolii were used to study the, effects of six insecticides (cartap, thiocyclam, triazophos, pyrazophos, abamectin, and cyromazine) on the different life stages of parasitoids by dipping method in the laboratory. The results showed that the susceptibility to insecticides were similar for both parasitoids. The most toxic insecticides were cartap, thiocyclam and triazophos, followed by pyrazophos, abamectin and cyromazine. The adult stage was more vulnerable to the tested insecticides than the immature stages. N. formosa was generally more tolerant to five of the insecticides tested than H. varicornis, but the susceptibility of both parasitoids to triazophos was similar. When comparing the use of only one of the parasitoids with the combination of both parasitoid and insecticide, the percentage of hosts killed by applying the parasitoid and the insecticide simultaneously increased 10.9~11.1 and 30.6~30.8% for H. varicornis and N. formosa, respectively. The results of this study suggest that cyromazine can conserve parasitoids and could be incorporated into L. trifolii control programs. Strategies for integrated management of disease, pests and mites on Gerbera jamesonii Bolues ex Hook. F. were also discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Ching-Chin Chien

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
health/environmental effects of pesticides
Research topic(s) for beneficials or antagonists:
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Liriomyza trifolii	Beans (Phaseolus)	Taiwan
Closterocerus formosus (parasitoid)	Liriomyza trifolii	Beans (Phaseolus)	Taiwan
Hemiptarsenus varicornis (parasitoid)	Liriomyza trifolii	Beans (Phaseolus)	Taiwan