Chinese Journal of Entomology (1998) 18, 187-197
Ching-Chin Chien and Shiu-Chih Ku (1998)
[The occurrence of Liriomyza trifolii (Diptera: Agromyzidae) and its parasitoids on fields of Gerbera jamesonii]
Chinese Journal of Entomology 18 (3), 187-197
Abstract: The occurrence of Liriomyza trifolii and its parasitoids in 2 Gerbera jamesonii gardens in Dakan, Taichung was investigated from October 1991 through June 1994. The results showed that the adult leafminer oviposited between the 2nd and the 7th leaves. The 3rd instar leafminer occurred in similar densities on the 3rd-4th and the 6th-7th leaves. L. trifolii larvae (the 2nd and 3rd instar larvae) showed aggregative spatial distribution with 3.3-7.3 basic units. The optimal sampling size at larval densities of 4 and 8 per leaf was estimated to be 12-41 and 5-20 leaves, respectively. L. trifolii and its parasitoids occurred synchronously in the fields. Under the control of chemicals and parasitoids, the density of 3rd instar larvae declined from 0-18.4 / leaf in 1991-1993 to 0-7.7 /leaf in 1994, and the insect pest shifted from frequent to occasional occurrence. Seven indigenous parasitoids were recorded in Taiwan. Among them, Hemiptarsenus varicornis and Neochrysocharis formosa occupied 38.86 and 44.77% of the parasitoids collected in the field, respectively (n=19,014). These 2 wasps occurred simultaneously without hyperparasitoids. About 11 species of common weeds in G. jamesonii fields were recorded, however, 9 and 5 species of them were suitable for emergence of L. trifolii and its parasitoids, respectively. Erechtites hieracifolia and Solanum nigrum were the most preferred host plants both for the leafminer and its parasitoids.
(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:
general biology - morphology - evolution
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Liriomyza trifolii | Gerbera (crop) | Taiwan | ||
| Closterocerus formosus (parasitoid) | Liriomyza trifolii | Gerbera (crop) | Taiwan | |
| Hemiptarsenus varicornis (parasitoid) | Liriomyza trifolii | Gerbera (crop) | Taiwan |
